HoosierSMW

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About HoosierSMW

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  • Gender Male
  • Location Central Indiana

HoosierSMW's Activity

  1. HoosierSMW added a post in a topic Tailwheel spring design   

    I appreciate the information and lead. My ship is rigged for a 1 1/4” wide spring. Do you feel the single 5/16” thick spring is stiff enough? I was going to use two 1/4” thick leaves. Thanks.
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  2. HoosierSMW added a post in a topic Tailwheel spring design   

    I am using a 582 so hopefully won't need to add weight to the tail. If I do, I would want it to be useful weight (springs, reinforcements, etc.). I am also thinking about upgrading the tail feathers to MkIV size with a trim tab so that would add some weight as well.
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  3. HoosierSMW added a post in a topic Tailwheel spring design   

    Thanks for the input gentlemen
    Jim, do you think the longer spring would put too much stress on the attach point? I was thinking it would allow more flex to protect the structure but may be wrong there. The vertical pivot is angling back a little and the spring does need to be bent a little more. I don't know how much the tail will sag when loaded so I will just have to experiment with that. I am going with two leaves as I don't think the single one will be strong enough. Would I weld in another tube to the spring bracket for the bolt to go through like the original bolt has?
    Dusty, I like the idea of a continuous arc to the tailwheel but not sure if I have the equipment to form it. I have access to a press brake with radius dies but not that large of a radius. Our forming rolls may work but would be difficult to end up at an exact angle. I could probably use the press to make a final kink to get just the right angle. May need to play with that one. Sounds like a little shorter spring with the continuous arc would be ideal. 
     
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  4. HoosierSMW added a post in a topic Bush gear failures   

    Would it be beneficial to have 1 or 2 pucks in the stack with a lower shore rating to allow a small amount of softer travel?
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  5. HoosierSMW added a topic in Avid Flyer General Hangar   

    Tailwheel spring design
    My kit did not have a tailwheel spring so I am making one from 5160 1/4 x 1 1/4 bar. Before working on the actual spring I am mocking it up in mild steel to check for issues. This will be a two leaf spring but the mockup is just one. My original thought was to make a two bend spring to get a longer working section without raising the tail. Now I'm not sure if that is too long or if (with the shallower angle to the bottom of the rudder) that it may allow it to flex enough to hit the bottom of the rudder. Is this OK or should I just go with a single bend spring with a shorter working section? The tailwheel is a 6" pneumatic.


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  6. HoosierSMW added a post in a topic Photo Record of Extended Wing Build   

    Thanks for the information Randy. This helps ease my mind a lot for my build. I had hoped the reduced washout wouldn't produce dangerous stall characteristics. I may decide to make or buy new tanks so I don't have to fight them to get the wings where I want them. I was thinking I could move the front lift strut attach point inboard to reduce washout. Hopefully that will work without causing other problems. Thanks again, Dean 
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  7. HoosierSMW added a topic in Avid Flyer General Hangar   

    Rib spacing question
    I'm looking at what advantage there is to building with 12" spacing vs 18" I know the heavy hauler and aerobat specified 12" but don't know if it is necessary from a strength standpoint. The extra ribs would add a little more weight and time but if it is worth it I'll go that route. Would narrower spacing affect VNE? Thanks for any wisdom you can share. Dean
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  8. HoosierSMW added a post in a topic Photo Record of Extended Wing Build   

    Another question - Did the built-in twist in the fuel tanks cause problems with the build? 
    Thanks again, Dean
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  9. HoosierSMW added a post in a topic Photo Record of Extended Wing Build   

    Randy,  I am working on a C model but have not started the wing. I have been planning to build with reduced washout and I see you used 7/8" overall twist in the extended wing. From the date of this post you have a good year of flight with the new wings. Are you happy with the resulting stall characteristics? Do you feel the change improved cruise flight? I'm very interested to hear your real world experience. Very nice work by the way! Thanks, Dean 
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  10. HoosierSMW added a post in a topic Building wings without washout   

    There is a letter from Harry Riblett concerning modifying the Avid airfoil. At the end of the letter (second page) he states that because the original Avid stol airfoil and the modified airfoil have such mild stall characteristics, the wing twist could be reduces or eliminated completely. There is a copy of this letter in the files and forms section but it is hard to read. 


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  11. HoosierSMW added a post in a topic Building wings without washout   

    Sorry, I should have mentioned in my original post. I would not remove all washout but would reduce it considerably - More like 3/8"-1/2". I believe that the J3 cub has a specified washout of 3/8" in 30". That should prevent wingtip stall at the same time as the root, but still provide more uniform lift along the length of the wing. The advantage would (hopefully) be a lower stall speed and lower drag in cruise flight. From everything I've read on the subject, 2" seems excessive. I plan to incorporate the F7-A control linkage geometry to help prevent any control reversal issues. I have never flown an aircraft with flaperons and don't know how that would play into the mix. I definitely appreciate your input. It would be great to hear from anyone has done this and what the outcome was. Thanks, Dean
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  12. HoosierSMW added a post in a topic Building wings without washout   

    The top of the new profile looks like it is OK with the tank. The bottom is very close toward the back half. I originally looked at the GA30-612 like the Kitfox but it was nowhere close to working with the original tanks. The 613.5 profile also allows the rib to be rotated for a little more positive incidence.
     






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  13. HoosierSMW added a post in a topic Building wings without washout   

    Thanks again - the drawing helps a lot! I guess I should have thought of using shim material to make up the difference.
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  14. HoosierSMW added a post in a topic Building wings without washout   

    Thank you Jim. Do you know of anyone who has built there wings without washout and what they thought of the change. Is the drawing for the extensions posted on the forum? I haven't seen it. Thank you. 
    Dean
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  15. HoosierSMW added a post in a topic Building wings without washout   

    Sorry, Doesn't look like the drawing showed up. I've attached as pdf's
    AIRFOIL.pdf
    INCIDENCE.pdf
    WINGSPAN.pdf
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