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  1. D

    Landing gear struts without scissor links

    the Culver Cadet used semi-circular leaf springs instead of scissors. The leaf spring was stiff enough laterally to act as the scissor to resist rotation of the inner, lower gear leg, but compliant in the vertical direction to provide all of the needed springiness for a smooth ride even on grass...
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    ‘Silent’ Propeller

    They were less "buzzy" sounding. More engine noise, less tip noise. That's purely subjective though. In the 1970s much research was done by Succi and he collaborated with Larrabee. They used Larrabee's design work (made Gossamer Condor viable, e.g.) to design a Skylane propeller to replace the...
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    Merlin Lite

    Yes. That’s the exact reason we lost the “two-seat ultralight” training exemption and were handed the Light Sport Aircraft category with its myriad “groups” of aircraft and licensing requirements for both Sport Pilots and Sport Pilot Instructors. The training exemption was being abused and...
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    Merlin Lite

    Yes, it has a cowl as displayed at Sun-N-Fun. This is the "good side" of the cowl; the other side has the cylinder head and part of the exhaust exposed. Note the coarse pitch setting on the prop of the land-plane example. From discussion with a knowledgeable bystander and customer, I...
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    Most Beautiful Aircraft Ever Built

    Paul may have shrugged off the question because he simply did not know; I heard from reliable sources back in the day that the EAA Acro Sport and Acro Sport II were designed by Jim Stewart (who went on to design the Stewart S-51 Mustang replica).
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    Most Beautiful Aircraft Ever Built

    Aye, that’s all that’s left on the Internet, I’m afraid. I looked up the current owner and requested a visit and he acted totally paranoid and declined. He said he was working on restoring it, but it’s just shoved back in the back of the hangar and neglected, by all accounts of airport locals...
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    Most Beautiful Aircraft Ever Built

    Smith AJ-2, rumored to be sequestered at the back of a hangar in Wisconsin….
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    Most Beautiful Aircraft Ever Built

    That’s not an airplane.
  9. D

    Out of Print Books

    Umm, that link took you to a page that listed several copies of that book as used books including the foldouts, but at a higher price point. However, if you register and set up a “want” they’ll email you whenever a new listing appears. Sometimes the new listings are at bargain prices. I’ve built...
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    Out of Print Books

    https://www.abebooks.com/servlet/SearchResults?kn=High%20speed%20Internal%20combustion%20engines%20by%20Ricardo&sts=t&cm_sp=SearchF-_-topnav-_-Results&ds=20
  11. D

    Bruce Carmichael's "drag reduction" book

    I'd like a copy....
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    Out of Print Books

    What do you mean by "released"?
  13. D

    New guy From Florida

    Well, pitch torque is about 10% of the total torque, so there's that.... But if we must disallow pitch torque on the grounds of it being a misconception, let's fish around in our bag of variables and find something else that might justify a conservative recommendation to ratchet up the torque a...
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    New guy From Florida

    M8-1.25 bolts are about 20 TPI whereas AN-5 bolts are 24 TPI. So, the M8 bolt should need a bit more torque to develop the same clamping pressure as an AN-5 bolt (lower TPI means less mechanical advantage). Sensenich publishes their wood prop guide, including recommended bolt torque...
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    project with Weldwood Plastic Resin glued wings, still good or automatically bad?

    At the start of the pandemic I reached out to the company that made the specialty plywood from which some of the beautiful thin-lamination multi-laminate props are carved. The plywood uses thin film adhesive from the rescorcinol family of glues, cured under pressure and heat. Their minimum order...
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    Best CAD tool for modeling and simulation on for a homebuilt.

    I’ve been told that moi3D was written by the guy who wrote Rhino 3D. There is much similarity in the interface and operation.
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    project with Weldwood Plastic Resin glued wings, still good or automatically bad?

    It is. She had to change vendors since WeldWood stopped selling it, but she found the same product under a different label. Which is unfortunate, because I was strongly encouraging her to change over to the superior Resorcinol-Formaldehyde (Cascophen), but she tried it and didn't like working...
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    project with Weldwood Plastic Resin glued wings, still good or automatically bad?

    She found a new supplier for the same product, just no longer under the WeldWood name.
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    project with Weldwood Plastic Resin glued wings, still good or automatically bad?

    This is not correct. Alaina has been using WeldWood (urea formaldehyde) for a long time. She trialled Cascophen in one video but decided she didn't like it.
  20. D

    Modern day "motorcycle of the air" aircraft class?

    Who is “Duncan” that you’re congratulating? All I see are cryptic usernames….
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