Original Posted By: "Lee L. Schiek"
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Pietenpol-List: Tall wheel spokes
Pietenpol-List: Tall wheel spokes
Original Posted By: Steve Eldredge
Two questions everybody. . . . .1. I'm making up tall wheel hubs per Henderson/Pavliga design, with brake addition. Source for ROLLED thread spokes?2. Brakes to be mechanical & used only for taxi manuvering & parking. Question: Do I REALLY need to consider a different spoke layout to absorb loads, or can I keep straight lace arrangement for looks? Has anybody actually experienced axial load failure caused by braking loads against straight lacing?All opinions, thoughts, second guesses appreciated.Lee________________________________________________________________________________
Two questions everybody. . . . .1. I'm making up tall wheel hubs per Henderson/Pavliga design, with brake addition. Source for ROLLED thread spokes?2. Brakes to be mechanical & used only for taxi manuvering & parking. Question: Do I REALLY need to consider a different spoke layout to absorb loads, or can I keep straight lace arrangement for looks? Has anybody actually experienced axial load failure caused by braking loads against straight lacing?All opinions, thoughts, second guesses appreciated.Lee________________________________________________________________________________
Pietenpol-List: Re: Tall wheel spokes
Original Posted By: Domenico Bellissimo
Hi Lee I've built my wheels, tail feathers, ribs and fuselage sides. I have been working on my engine a B ford block much modified. I decided on the tall wheels split gear with brakes. I don't like the thought of taxiing, on hard surfaces, near expensive aircraft with out brakes. I intend to cover the spokes with fabric disks and so the cross laced motorcycle wheels won't detract from the appearance. I have been thinking about brake operating mechanisms but haven't developed much past the mental image yet. Piets are Fun! J Mc.________________________________________________________________________________
Hi Lee I've built my wheels, tail feathers, ribs and fuselage sides. I have been working on my engine a B ford block much modified. I decided on the tall wheels split gear with brakes. I don't like the thought of taxiing, on hard surfaces, near expensive aircraft with out brakes. I intend to cover the spokes with fabric disks and so the cross laced motorcycle wheels won't detract from the appearance. I have been thinking about brake operating mechanisms but haven't developed much past the mental image yet. Piets are Fun! J Mc.________________________________________________________________________________
Pietenpol-List: Re: Tall wheel spokes
Original Posted By:> "Lee L. Schiek"
McNarry, John wrote:>
McNarry, John wrote:>
Pietenpol-List: Re: Tall wheel spokes
Original Posted By: "Larry L. Neal"
Lee,I'm not absolutely positive about the 1st question, and I'd say that rolledthreads carry more load than cut, yes. I doubt though, that you'll find anyspokes of any sort with rolled threads, they don't carry *that* much load tobe effective. Sorta like hammer forged belt buckles.Regarding straight spokes. I submit that this will be a problem. Anybraking loads will be greatly amplified, (though I'd betcha it busts in themiddle not on the "non rolled" threaded side). Landing loads are diminishedas well, versus most crossed patterns.Please don't do this, they will definitely loosen up at the least. This isnot Piet experience, but bicycle stuff, where the weight vs strength issueis even more important.To be honest, straight spokes don't look that spiffy anyway....I have not read the referenced design notes and I still don't have a Pietbuilt, so take it for what it worth. I'll take your question as a heads upand read this stuff, though I am currently planning to use a couple ofmid-sized motorcycle front wheels myself.LarryLee L. Schiek wrote:> Two questions everybody. . . . .>> 1. I'm making up tall wheel hubs per Henderson/Pavliga design, with> brake addition. Source for ROLLED thread spokes?> 2. Brakes to be mechanical & used only for taxi manuvering & parking.> Question: Do I REALLY need to consider a different spoke layout to> absorb loads, or can I keep straight lace arrangement for looks?> Has anybody actually experienced axial load failure caused by braking> loads against straight lacing?> All opinions, thoughts, second guesses appreciated.> Lee________________________________________________________________________________
Lee,I'm not absolutely positive about the 1st question, and I'd say that rolledthreads carry more load than cut, yes. I doubt though, that you'll find anyspokes of any sort with rolled threads, they don't carry *that* much load tobe effective. Sorta like hammer forged belt buckles.Regarding straight spokes. I submit that this will be a problem. Anybraking loads will be greatly amplified, (though I'd betcha it busts in themiddle not on the "non rolled" threaded side). Landing loads are diminishedas well, versus most crossed patterns.Please don't do this, they will definitely loosen up at the least. This isnot Piet experience, but bicycle stuff, where the weight vs strength issueis even more important.To be honest, straight spokes don't look that spiffy anyway....I have not read the referenced design notes and I still don't have a Pietbuilt, so take it for what it worth. I'll take your question as a heads upand read this stuff, though I am currently planning to use a couple ofmid-sized motorcycle front wheels myself.LarryLee L. Schiek wrote:> Two questions everybody. . . . .>> 1. I'm making up tall wheel hubs per Henderson/Pavliga design, with> brake addition. Source for ROLLED thread spokes?> 2. Brakes to be mechanical & used only for taxi manuvering & parking.> Question: Do I REALLY need to consider a different spoke layout to> absorb loads, or can I keep straight lace arrangement for looks?> Has anybody actually experienced axial load failure caused by braking> loads against straight lacing?> All opinions, thoughts, second guesses appreciated.> Lee________________________________________________________________________________
Pietenpol-List: Re: Tall wheel spokes
Original Posted By: Greg Cardinal
>Two questions everybody. . . . .>>1. I'm making up tall wheel hubs per Henderson/Pavliga design, with> brake addition. Source for ROLLED thread spokes?Lee- try your local motorcycle shop and ask them if they can order a setfor you thru Buchannen's (spelling) in CA. They rolled my spokes aftermy local shop faxed them a sketch of my homemade hubs and intendedrim size, etc. They were not cheap but they are the way to go. I'm toldcut threads can be much weaker and should be avoided.>2. Brakes to be mechanical & used only for taxi manuvering & parking.> Question: Do I REALLY need to consider a different spoke layout to> absorb loads, or can I keep straight lace arrangement for looks?loads (and acceleration in the case of a motorcycle). Straight spokes areused if you have no brakes. Maybe we have a lurking mechanical engineerin the audience who might shed some light on this for us. > Has anybody actually experienced axial load failure caused by braking > loads against straight lacing?>All opinions, thoughts, second guesses appreciated.>Lee>>________________________________________________________________________________
>Two questions everybody. . . . .>>1. I'm making up tall wheel hubs per Henderson/Pavliga design, with> brake addition. Source for ROLLED thread spokes?Lee- try your local motorcycle shop and ask them if they can order a setfor you thru Buchannen's (spelling) in CA. They rolled my spokes aftermy local shop faxed them a sketch of my homemade hubs and intendedrim size, etc. They were not cheap but they are the way to go. I'm toldcut threads can be much weaker and should be avoided.>2. Brakes to be mechanical & used only for taxi manuvering & parking.> Question: Do I REALLY need to consider a different spoke layout to> absorb loads, or can I keep straight lace arrangement for looks?loads (and acceleration in the case of a motorcycle). Straight spokes areused if you have no brakes. Maybe we have a lurking mechanical engineerin the audience who might shed some light on this for us. > Has anybody actually experienced axial load failure caused by braking > loads against straight lacing?>All opinions, thoughts, second guesses appreciated.>Lee>>________________________________________________________________________________