Pietenpol-List: Landing gear type: Pros and Cons, Steel or wood?
Pietenpol-List: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: "Mark Roberts"
Subject: Re: Pietenpol-List: Re: Bendix magneto starting issuesFor a good review of Mags and mag problems check out this EAA video. http://www.eaavideo.org/video.aspx?v=1367499350001The guy is truely an expert. Blue Skies, Steve D________________________________________________________________________________Subject: Pietenpol-List: Landing gear type: Pros and Cons, Steel or wood?
Subject: Re: Pietenpol-List: Re: Bendix magneto starting issuesFor a good review of Mags and mag problems check out this EAA video. http://www.eaavideo.org/video.aspx?v=1367499350001The guy is truely an expert. Blue Skies, Steve D________________________________________________________________________________Subject: Pietenpol-List: Landing gear type: Pros and Cons, Steel or wood?
Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: "tools"
Please forgive me if this is redundant. I thought I had asked a while back, butmy search proved futile. So, I wish to tap the wisdom of this collected intelligentsia...I am prepping for the Landing Gear install, thus I need to decide on the styleI want. My wife and I both like the spoke'd tire look, so those would be the tirestyle we will use. I haven't seen those on a steel gear, so I'm not sure howit would look, or whether the added size would prove problematic to the gearstrength.The main dis-advantage to the wooden gear to me is what I have heard about the'wobble' of the axle in the platform that it rides on due to the shock cord mount.I have heard the axle will move slightly forward and rearward as you turncorners, making it slightly 'wiggly'. Other than that it looks like an easieroption to build for me, and cheaper. But, this is the project of a lifetime,so the added work and money is not as important as the ultimate usefulness ofthe choice. I will fly almost exclusively from paved runways (can only think ofone grass field I would fly to at the annual west coast piet fly-in...).I am looking for pros and cons, do's and don'ts, thoughts and suggestions regardingthe choice from those that have thought about such things
)Many thanks!BTW, The Mrs. in the first seat below
)MarkRead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/2012 ... ___Subject: Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Please forgive me if this is redundant. I thought I had asked a while back, butmy search proved futile. So, I wish to tap the wisdom of this collected intelligentsia...I am prepping for the Landing Gear install, thus I need to decide on the styleI want. My wife and I both like the spoke'd tire look, so those would be the tirestyle we will use. I haven't seen those on a steel gear, so I'm not sure howit would look, or whether the added size would prove problematic to the gearstrength.The main dis-advantage to the wooden gear to me is what I have heard about the'wobble' of the axle in the platform that it rides on due to the shock cord mount.I have heard the axle will move slightly forward and rearward as you turncorners, making it slightly 'wiggly'. Other than that it looks like an easieroption to build for me, and cheaper. But, this is the project of a lifetime,so the added work and money is not as important as the ultimate usefulness ofthe choice. I will fly almost exclusively from paved runways (can only think ofone grass field I would fly to at the annual west coast piet fly-in...).I am looking for pros and cons, do's and don'ts, thoughts and suggestions regardingthe choice from those that have thought about such things


Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: "899PM"
Kevin Purtee has spoke wheels with steel gear. I got a ride and thought it feltgreat. I know he's not a fan of bungee, as he had problems with it and switchedto a spring.My Piet is the classic Harley wheel with wood gear. Many aren't sure about thesuitability of a stock motorcycle wheel. I learned to fly a tailwheel in thisplane and taught my son... needless to say it's got a workout and is holdingup fine. I don't mind the wobble at all, and never really noticed it until youmentioned it.Again, the bungee is a bit of a pain in that it does regularly wear out, but notthat hard to replace, nor very expensive. While I thought I'd fly mostly grass, the truth is that I'm about 95 percent onpavement and the wood gear/straight axle hasn't proved problematic in that venueat all. Lastly, I did have to replace one of the wood members of my gear as I noticed somecracking. I'm quite certain that damaged occurred as a result of an abortedtakeoff that went off runway. The point is, I noticed the damage well beforethe gear failed and it was easy to fix. Had it been a weldment that wasn't up to the task (either faulty weld or excessiveforce) I'm not sure that would be the case. Having pushed around a few cubs, champs and chiefs, I think the larger diameterwheels are easier if that's a concern.Things to consider. Pretty sure either would be fine!ToolsRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Kevin Purtee has spoke wheels with steel gear. I got a ride and thought it feltgreat. I know he's not a fan of bungee, as he had problems with it and switchedto a spring.My Piet is the classic Harley wheel with wood gear. Many aren't sure about thesuitability of a stock motorcycle wheel. I learned to fly a tailwheel in thisplane and taught my son... needless to say it's got a workout and is holdingup fine. I don't mind the wobble at all, and never really noticed it until youmentioned it.Again, the bungee is a bit of a pain in that it does regularly wear out, but notthat hard to replace, nor very expensive. While I thought I'd fly mostly grass, the truth is that I'm about 95 percent onpavement and the wood gear/straight axle hasn't proved problematic in that venueat all. Lastly, I did have to replace one of the wood members of my gear as I noticed somecracking. I'm quite certain that damaged occurred as a result of an abortedtakeoff that went off runway. The point is, I noticed the damage well beforethe gear failed and it was easy to fix. Had it been a weldment that wasn't up to the task (either faulty weld or excessiveforce) I'm not sure that would be the case. Having pushed around a few cubs, champs and chiefs, I think the larger diameterwheels are easier if that's a concern.Things to consider. Pretty sure either would be fine!ToolsRead this topic online here:http://forums.matronics.com/viewtopic.p ... ___Subject: Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: Michael Groah
Big Wheels...spokes hiding under covers. My intent was to create a faux Bendixlook.--------PAPA MIKERead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/img_ ... ______Date: Wed, 7 Mar 2012 12:08:11 -0800 (PST)
Big Wheels...spokes hiding under covers. My intent was to create a faux Bendixlook.--------PAPA MIKERead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/img_ ... ______Date: Wed, 7 Mar 2012 12:08:11 -0800 (PST)
RE: Pietenpol-List: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: owner-pietenpol-list-server(at)matronics.com
The main disadvantage to the wooden straight axle gear is actually theweight. That axle is heavy, as are the wire wheels (but if you are doingwire wheels regardless, then that doesn't matter).As for "wobble", I've never noticed it in 260 hours of flying. I have guidepins on my axle to restrain it from rotating when braking, and it does movedaround fore and aft a bit when braking, but nothing that is any problem atall.The wooden gear is extremely rugged (which is why Curtiss JN-4's used it).The biggest advantage to the straight axle is that camber and toe-inproblems simply don't exist.Jack PhillipsNX899JPSmith Mountain Lake, Virginia-----Original Message-----
The main disadvantage to the wooden straight axle gear is actually theweight. That axle is heavy, as are the wire wheels (but if you are doingwire wheels regardless, then that doesn't matter).As for "wobble", I've never noticed it in 260 hours of flying. I have guidepins on my axle to restrain it from rotating when braking, and it does movedaround fore and aft a bit when braking, but nothing that is any problem atall.The wooden gear is extremely rugged (which is why Curtiss JN-4's used it).The biggest advantage to the straight axle is that camber and toe-inproblems simply don't exist.Jack PhillipsNX899JPSmith Mountain Lake, Virginia-----Original Message-----
Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: "Catdesigns"
Skip: Yes, Sue and are are planning on being at Sun n Fun the whole time.Jim: I think the LC resonance frequency is much higher than the system cycle frequencywhich is 2 times engine speed and actually needs to be. Ignition systemsare, as you describe, an LC circuit but it isn't in resonance. Look at itthis way. The points close. This discharges the capacitor almost instantlyand current starts flowing in the inductor. Note that the capacitor is not electricallypresent since it's shorted. The field builds up. If you put an oscilloscopeon it and watched CURRENT, it would start from 0 and rise on a paraboliccurve to the point where, given enough time, it would hit a maximum determinedby the ohmic resistance of the coil. If there were a large iron core(picture a wire wrapped around a nail in science class), you'd have an electromagnet.Some time before this steady state maximum occurs, the points open. Current flow stops almost instantaneously. With no voltage present, the fieldcollapses but the energy has to go somewhere. The low voltage winding of thecoil sees a, maybe .016 air gap, but the 14 volts can't jump that. The secondarycoil, on the other hand can generate several thousand volts and can jumpyour .032 spark plug gap with ease. It's the path of least resistance. Notethat when the points first open, the gap is VERY small and the collapsing fieldfrom the low voltage winding CAN jump it. The condenser absorbs just enoughof the the current to allow the points to fully open without excessive arcing.There is no resonance in the "tuned circuit" sense like you find in radios.The better analogy is that the coil is an AC transformer. If you look at thecurrent waveform in the low voltage side, it really is a sawtooth but with curved"sides". The frequency is determined by the physical speed of the rotatingcam opening and closing the points. I'm hoping the drawing attached makessense.Note that as the rpm increases, the amount of time available to build up the fieldgoes down and the spark gets weakerYou are correct that the condenser and coil must be compatible. If the condenseris too small, it won't be able to absorb enough energy to allow the pointsto open cleanly. If it is too large, the current flowing when the points closeand discharge it will also burn them. Again, it's not a "tuned" circuit.Hope this helps.DaveRead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/poin ... ___Subject: Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Skip: Yes, Sue and are are planning on being at Sun n Fun the whole time.Jim: I think the LC resonance frequency is much higher than the system cycle frequencywhich is 2 times engine speed and actually needs to be. Ignition systemsare, as you describe, an LC circuit but it isn't in resonance. Look at itthis way. The points close. This discharges the capacitor almost instantlyand current starts flowing in the inductor. Note that the capacitor is not electricallypresent since it's shorted. The field builds up. If you put an oscilloscopeon it and watched CURRENT, it would start from 0 and rise on a paraboliccurve to the point where, given enough time, it would hit a maximum determinedby the ohmic resistance of the coil. If there were a large iron core(picture a wire wrapped around a nail in science class), you'd have an electromagnet.Some time before this steady state maximum occurs, the points open. Current flow stops almost instantaneously. With no voltage present, the fieldcollapses but the energy has to go somewhere. The low voltage winding of thecoil sees a, maybe .016 air gap, but the 14 volts can't jump that. The secondarycoil, on the other hand can generate several thousand volts and can jumpyour .032 spark plug gap with ease. It's the path of least resistance. Notethat when the points first open, the gap is VERY small and the collapsing fieldfrom the low voltage winding CAN jump it. The condenser absorbs just enoughof the the current to allow the points to fully open without excessive arcing.There is no resonance in the "tuned circuit" sense like you find in radios.The better analogy is that the coil is an AC transformer. If you look at thecurrent waveform in the low voltage side, it really is a sawtooth but with curved"sides". The frequency is determined by the physical speed of the rotatingcam opening and closing the points. I'm hoping the drawing attached makessense.Note that as the rpm increases, the amount of time available to build up the fieldgoes down and the spark gets weakerYou are correct that the condenser and coil must be compatible. If the condenseris too small, it won't be able to absorb enough energy to allow the pointsto open cleanly. If it is too large, the current flowing when the points closeand discharge it will also burn them. Again, it's not a "tuned" circuit.Hope this helps.DaveRead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/poin ... ___Subject: Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: "Don Emch"
MarkI was in the same boat as you a few years ago. I did the same kind of missionevaluation and have a similar paved runway outlook as you. It made me think thesplit axle would be better. However, after asking around I could find no reasonnot to build the wood gear. One big deciding factor for me was I just didnthave the confidence to build the steel gear and I needed to get the projectmoving as other parts had frustrated me to the point where I wasnt working onthe plane anymore. While trying to decide between the two I modified the attached pictures to giveme an idea how the landing gear choice would change the overall appearance ofthe plane. For me the final look of the plane is very important. Basically Iwould pick the one you think looks the best.Wood Gear Pros:Vintage lookUniqueNo toe in or toe out problems. Simpler to build.People question your sanity.Cons:The axel and spreader bar are close to the ground and might catch on tall grassor other things like runway lights if you find yourself in a bad situation.Need to stop axel rotation if you use brakes.HeavyPeople question your sanityIf you like to be unique, everyone seems to be building the wood gear lately.--------ChrisSacramento, CAWestCoastPiet.comRead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/pict ... ___Subject: Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
MarkI was in the same boat as you a few years ago. I did the same kind of missionevaluation and have a similar paved runway outlook as you. It made me think thesplit axle would be better. However, after asking around I could find no reasonnot to build the wood gear. One big deciding factor for me was I just didnthave the confidence to build the steel gear and I needed to get the projectmoving as other parts had frustrated me to the point where I wasnt working onthe plane anymore. While trying to decide between the two I modified the attached pictures to giveme an idea how the landing gear choice would change the overall appearance ofthe plane. For me the final look of the plane is very important. Basically Iwould pick the one you think looks the best.Wood Gear Pros:Vintage lookUniqueNo toe in or toe out problems. Simpler to build.People question your sanity.Cons:The axel and spreader bar are close to the ground and might catch on tall grassor other things like runway lights if you find yourself in a bad situation.Need to stop axel rotation if you use brakes.HeavyPeople question your sanityIf you like to be unique, everyone seems to be building the wood gear lately.--------ChrisSacramento, CAWestCoastPiet.comRead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/pict ... ___Subject: Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: "Jack Phillips"
There are quite a few out there that have the wire wheels and the split axle gear.I chose to cover mine. Mr. Pietenpol went this route with 12988 and leftthem uncovered. I'm happy with the set up. Other than changing bungees everycouple of years it works out well.Don EmchNX899DERead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/whee ... __________
There are quite a few out there that have the wire wheels and the split axle gear.I chose to cover mine. Mr. Pietenpol went this route with 12988 and leftthem uncovered. I'm happy with the set up. Other than changing bungees everycouple of years it works out well.Don EmchNX899DERead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/whee ... __________
RE: Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: owner-pietenpol-list-server(at)matronics.com
Unfortunately, Don, the straight axle version also requires changing thebungees every couple of years - my least favorite airplane task in theworld.Jack PhillipsNX899JPSmith Mountain Lake, Virginia-----Original Message-----
Unfortunately, Don, the straight axle version also requires changing thebungees every couple of years - my least favorite airplane task in theworld.Jack PhillipsNX899JPSmith Mountain Lake, Virginia-----Original Message-----
Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: shad bell
Yeah... I'm up for it this year. [Crying or Very sad] Been preparing...mentallyand physically! Ha! Not a fun task. I have streamlined the process a littlethough. The main requirement is cussing. Unfortunately because of thatI can't train the kids to help for a few more years.Don EmchNX899DERead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Wed, 7 Mar 2012 15:40:23 -0800 (PST)
Yeah... I'm up for it this year. [Crying or Very sad] Been preparing...mentallyand physically! Ha! Not a fun task. I have streamlined the process a littlethough. The main requirement is cussing. Unfortunately because of thatI can't train the kids to help for a few more years.Don EmchNX899DERead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Wed, 7 Mar 2012 15:40:23 -0800 (PST)
Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: "Mark Roberts"
FWIW. 280 hours since 9/09 including two trips from Austin, TX to Brodhead. Onlyissues were the result of my welding. I changed from bungees to springs asMike Danforth mentioned, for good, solid reasons.--------Kevin "Axel" PurteeNX899KPAustin/Georgetown, TXRead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/wire ... ___Subject: Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
FWIW. 280 hours since 9/09 including two trips from Austin, TX to Brodhead. Onlyissues were the result of my welding. I changed from bungees to springs asMike Danforth mentioned, for good, solid reasons.--------Kevin "Axel" PurteeNX899KPAustin/Georgetown, TXRead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/wire ... ___Subject: Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: "Jack"
Hey Guys!Many, Many thanks for these comments. It is EXACTLY what I was hoping to learnfrom ya'll. I am encouraged to know others have thought this one out ahead oftime (Duh... It IS an 80 year old design after all
)My main concern is my inexperience with metal. I am going to take the plans tomy welding friend soon and ask him about it.The best metal gear I've seen is Charlie Millers' gear with the streamlined tubingfor the legs. Very sturdy, but re-designing stuff like this isn't my cup oftea.So, I'm going to re-read all of this again, but want to thank ya'll again for thehelp. It is this kind of interaction that really makes this group special.And, thanks for the kind words about the Mrs. in the front seat!
) She's only5'2", so I need to raise the seat a bit when I put it in... Ha! She'll get allthe bugs in the teeth for me !MarkRead this topic online here:http://forums.matronics.com/viewtopic.p ... __________
Hey Guys!Many, Many thanks for these comments. It is EXACTLY what I was hoping to learnfrom ya'll. I am encouraged to know others have thought this one out ahead oftime (Duh... It IS an 80 year old design after all


RE: Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: owner-pietenpol-list-server(at)matronics.com
Mark,Both gear systems have there advantages and disadvantages as has beenreported. I'm currently destroying a lot of 4130 on my split gear. Despiteall the measuring, fitting and cutting I'm still having problems gettingperfect fits. After a week I only have the left front V done. All part ofthe fun.Jack TextorDSMNX1929T-----Original Message-----
Mark,Both gear systems have there advantages and disadvantages as has beenreported. I'm currently destroying a lot of 4130 on my split gear. Despiteall the measuring, fitting and cutting I'm still having problems gettingperfect fits. After a week I only have the left front V done. All part ofthe fun.Jack TextorDSMNX1929T-----Original Message-----
Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: "Douwe Blumberg"
raykrause(at)frontiernet. wrote:> Papa Mike,> > How did you make the wheel covers, and how are they attached to the wheel? > Surely they are not riveted to the rim?> > Thanks,> > Ray Krause> Sky Scout in progress> ---Ray,The wheel covers are a conic development. Started with flat sheet and calculatedthe diameters to produce the desired "cone". The covers are bolted to the flangesof the hub. The rivets in the periphery are purely cosmetic. The wheelsshown in the pic were my prototypes. The attached pics show the final version.A lot of work....but they sure look neat! I designed them to use the early Tri-Pacermechanical brakes.--------PAPA MIKERead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/whee ... __________
raykrause(at)frontiernet. wrote:> Papa Mike,> > How did you make the wheel covers, and how are they attached to the wheel? > Surely they are not riveted to the rim?> > Thanks,> > Ray Krause> Sky Scout in progress> ---Ray,The wheel covers are a conic development. Started with flat sheet and calculatedthe diameters to produce the desired "cone". The covers are bolted to the flangesof the hub. The rivets in the periphery are purely cosmetic. The wheelsshown in the pic were my prototypes. The attached pics show the final version.A lot of work....but they sure look neat! I designed them to use the early Tri-Pacermechanical brakes.--------PAPA MIKERead this topic online here:http://forums.matronics.com/viewtopic.p ... ttachments: http://forums.matronics.com//files/whee ... __________
Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: "Mark Roberts"
Subject: Re: Pietenpol-List: Re: Bendix magneto starting issuesHow do you go about matching the condenser to the coil to work mosteffectively?Bill Princell -This process requires that the condenser be matched to the coil to workmost effectively. The coil has a certain inductance and the condenser has acertain capacitance. Each one of these has its own frequencycharacteristics. Pairing them up creates a specific resonant frequencydependent on both components. But if they're not matched (like a burned-outcondenser), the resonant frequency changes.On Wed, Mar 7, 2012 at 1:52 PM, Dortch, Steven D MAJ NG NG NGB wrote:> steven.d.dortch(at)us.army.mil>>> For a good review of Mags and mag problems check out this EAA video.>> http://www.eaavideo.org/video.aspx?v=1367499350001>> The guy is truely an expert.>> Blue Skies,> Steve D>>________________________________________________________________________________Subject: Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Subject: Re: Pietenpol-List: Re: Bendix magneto starting issuesHow do you go about matching the condenser to the coil to work mosteffectively?Bill Princell -This process requires that the condenser be matched to the coil to workmost effectively. The coil has a certain inductance and the condenser has acertain capacitance. Each one of these has its own frequencycharacteristics. Pairing them up creates a specific resonant frequencydependent on both components. But if they're not matched (like a burned-outcondenser), the resonant frequency changes.On Wed, Mar 7, 2012 at 1:52 PM, Dortch, Steven D MAJ NG NG NGB wrote:> steven.d.dortch(at)us.army.mil>>> For a good review of Mags and mag problems check out this EAA video.>> http://www.eaavideo.org/video.aspx?v=1367499350001>> The guy is truely an expert.>> Blue Skies,> Steve D>>________________________________________________________________________________Subject: Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: Jim Ash
Ha! Thanks Michael!I didn't even think about the fact I'd be cutting others out of the comfort ofthe windscreen by jacking the seat up a few inches!Funny, but that just saved me a serious "Oops" that wouldn't have been easy tocorrect!Love the wheel covers too Papa Mike!MarkRead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Thu, 8 Mar 2012 17:17:06 -0500 (EST)
Ha! Thanks Michael!I didn't even think about the fact I'd be cutting others out of the comfort ofthe windscreen by jacking the seat up a few inches!Funny, but that just saved me a serious "Oops" that wouldn't have been easy tocorrect!Love the wheel covers too Papa Mike!MarkRead this topic online here:http://forums.matronics.com/viewtopic.p ... ______Date: Thu, 8 Mar 2012 17:17:06 -0500 (EST)
Re: Pietenpol-List: Re: Landing gear type: Pros and Cons, Steel or wood?
Original Posted By: "899PM"
Thanks, Mike!Beautiful work. Is that wheel convex on only the outside? In bicycles that is called "dished", as in the rear wheel with an 8-10 speed cog. Looks as though only the outside of you disc is convex.Thanks again for the wonderful pictures. Now I have another project.Ray Krause----- Original Message -----
Thanks, Mike!Beautiful work. Is that wheel convex on only the outside? In bicycles that is called "dished", as in the rear wheel with an 8-10 speed cog. Looks as though only the outside of you disc is convex.Thanks again for the wonderful pictures. Now I have another project.Ray Krause----- Original Message -----