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#1
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taildragger to trike
A couple of folks have built their Himaxes and Minimaxes as trikes. On the
surface, it doesn't seem like an overwhelmingly difficult engineering problem to overcome. How deluded might I be? |
#2
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taildragger to trike
anon wrote:
A couple of folks have built their Himaxes and Minimaxes as trikes. On the surface, it doesn't seem like an overwhelmingly difficult engineering problem to overcome. How deluded might I be? Moderately to extremely depending on how design/engineering savvy you are. If someone has a successful installation just copy that. |
#3
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taildragger to trike
On Feb 14, 7:23 pm, "J.Kahn" wrote:
anon wrote: A couple of folks have built their Himaxes and Minimaxes as trikes. On the surface, it doesn't seem like an overwhelmingly difficult engineering problem to overcome. How deluded might I be? Moderately to extremely depending on how design/engineering savvy you are. If someone has a successful installation just copy that. Be careful designing landing gear mount structure. Taxiing over rough ground is really hard on gear, harder than bumpy landings. I've seen some gear on ultralights that looks scary. Watched one collapse on landing several years ago. And have heard of other gear failures on homebuilts. We had a gear failure on a Glastar about five years ago, when the single AN5 bolt sheared during braking after touchdown. The gear is a round, tapered steel rod mounted in a steel tube socket welded to the fuselage cage structure, and that AN5 bolt passed through the tube and leg. Braking forces try to turn the rod in the socket and landing/turning/taxiing loads try to push it inward, and that bolt couldn't take it. After the repairs, it had a single 3/8" NAS bolt, about three times stronger than the original AN5. Didn't break no more. So it ain't as simple as it looks. Worse, nosegears have to be strong enough to take a lot more abuse than a tailwheel. The whole weight of the airplane comes against the nosegear in a botched landing or on touchdown on a really soft surface. Dan Dan |
#4
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taildragger to trike
Be careful designing landing gear mount structure. Taxiing over rough ground is really hard on gear, harder than bumpy landings. I've seen some gear on ultralights that looks scary. Watched one collapse on landing several years ago. And have heard of other gear failures on homebuilts. We had a gear failure on a Glastar about five years ago, when the single AN5 bolt sheared during braking after touchdown. The gear is a round, tapered steel rod mounted in a steel tube socket welded to the fuselage cage structure, and that AN5 bolt passed through the tube and leg. Braking forces try to turn the rod in the socket and landing/turning/taxiing loads try to push it inward, and that bolt couldn't take it. (additional info snipped) I've never looked closely at the Glastar undercarriage, but the RV-8A uses a similar system with good success. In the case of the RV that I looked at, there would be no torsion applied to the mounting of the gear leg with the tire correctly inflated. However, some torsional force would exist in the event that the tire is either over-inflated or under-inflated. Another point that I feel compelled to make, even though I really do not like to say it, it that the gear leg and socket should NOT be lubricated. I am not saying that the gear on the Glastar was, but just making the point that the bolt is mainly to align the under carriage when not in use and that friction should greatly exceed any capacity of the bolt when the airplane's weight is on the wheels. Peter (Not a mechanic, but I've seen some strange things!) |
#5
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taildragger to trike
On Sun, 18 Feb 2007 12:32:19 -0500, "Peter Dohm"
wrote: but just making the point that the bolt is mainly to align the under carriage when not in use and that friction should greatly exceed any capacity of the bolt when the airplane's weight is on the wheels. oh yeah? how did you work that out? ever seen one flexing under load? Stealth Pilot |
#6
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taildragger to trike
but just making the point that the bolt is mainly to align the under carriage when not in use and that friction should greatly exceed any capacity of the bolt when the airplane's weight is on the wheels. oh yeah? how did you work that out? ever seen one flexing under load? I haven't watched, but yes they do. And I still think that should provide a jamming effect. As to what, if anything should be used as an assembly coating, to prevent rust, I really don't know. OTOH, a similar system is used on a number of certified aircraft and mechinics possess a wealth of knowledge. This is really the sort of thing that should be discussed over a case of beer. Peter |
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