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  1. Orrem31

    This tool could revolutionize scratchbuilding

    Aluminum, I apologize for my off the cuff first post "advertisement" remark. I'm a cynical and grumpy Yankee when it comes to new mouse traps. To give you an idea how backwards and low tech I can be I much prefer my ancient old Throatless Shear to patterns and router, it's slow, quiet, and...
  2. Orrem31

    This tool could revolutionize scratchbuilding

    You joined today and posted an advertisement as your first post?
  3. Orrem31

    Neat engineering youtube channel

    The "The Spitfire's Fatal Flaw" video tittle is click bait for sure. How accurate was he in regards to Beatrice Shillings contribution? Was it really helpful in preventing flooding or was that overstated as well? Thanks much, -jeff
  4. Orrem31

    Has anybody was able to conduct business with Great Plains new owner?

    Steve Bennett passed away last year. http://www.eaa80.org/steve-bennetts-death/
  5. Orrem31

    Neat engineering youtube channel

    I found Real Engineering and really like it. The about says "Interesting answers to simple questions." I like it. Most of his work thus far has been aviation and space related. The Material That Changed The World is the latest video... -jeff
  6. Orrem31

    45 Horse Half VW Prop Weight

    In order to discuss these crankshaft failures and possible remedies I believe that at a minimum one must determine what type of fracture has occurred on each of these four cranks. If they are all fatigue fractures that tells one story. If, on the other hand, they are all brittle fractures it...
  7. Orrem31

    Pilots who write.

    Some recent aviation non-fiction I enjoyed: Unbroken by Laura Hillenbrand The Aviators by Winston Groom Hauling Checks by Alex Stone
  8. Orrem31

    Pilots who write.

    I have really enjoyed David Freed's fictional work on his Cordell Logan series: Flat Spin (2012) Fangs Out (2013) Voodoo Ridge (2014) The Three-Nine Line (2015)
  9. Orrem31

    Spencer Original Design

    Thanks Joe. Really enjoyed our early discussion about your mods and following your progress. If HBA had a Get'n'R'Done award you would be a shoe in :) The left yaw on power reduction has me a bit stumped. Stupid question - Did you check the wing rigging post welding and covering? Almost...
  10. Orrem31

    Spencer Original Design

    Really looking good Joe! I think the new tail looks great. Has that certain je ne sais quoi. -jeff
  11. Orrem31

    Spencer Original Design

    Something like that happens on motorcycles with windscreens. The low pressure behind the some windscreens suck the exhaust forward and up to the riders face. It's common to add a vent in the bottom of the windscreen to solve the problem by reducing the low pressure air pocket...
  12. Orrem31

    New Aircraft design tube fuselage with foam core wing

    Thanks for posting the correction.. I should have taken a bit more time to review before posting.
  13. Orrem31

    New Aircraft design tube fuselage with foam core wing

    I did not provide a validation of your specification, but instead provided an example to help illuminate the trade offs between g limits and aircraft weight. Are you trying to build a two place aerobatic trainer or aerobatic when flown solo and utility when flown with both seats filled? Makes a...
  14. Orrem31

    New Aircraft design tube fuselage with foam core wing

    Just for reference, not having a RV-4 manual, I found posted on VAF that "The structure of the RV-4 and RV-6/6A have been designed to withstand aerobatic design loads of plus 6 Gs and minus 3 Gs at an aerobatic gross wt of 1375lb, ..." So, if we take this new number for the RV4 to match +6g...
  15. Orrem31

    New Aircraft design tube fuselage with foam core wing

    ok, to rationalize your numbers we really need to firm up you limit load factor.. Limit loads are the maximum loads expected in service (FAR 23.301(a)), and ultimate loads are limit times 1.5 (FAR 23.303) and is the value you use to design with. Normal Category Limit -1.52g to +3.8g Ultimate...
  16. Orrem31

    New Aircraft design tube fuselage with foam core wing

    cenpen, It might be helpful to think of aircraft design in four phases. At this point it feels like you have not really completed phase one and are jumping into phase two. That makes any meaningful discussion around phase two issues difficult or pointless. Some have eluded to this issue by...
  17. Orrem31

    New Aircraft design tube fuselage with foam core wing

    Pride goes before a fall. Highly recommend you have a look at the sticky on aircraft design reference material. It provides a great book list to get you started. Technical references - Books, technical papers, software, etc. If you want a simple 128 page introduction to aircraft design...
  18. Orrem31

    New Homebuilt Anything

    This is a from the EAA website... Brad gives advice about seeking out local pilots to find the best local instructors is really spot on. You can follow his progress through each step of his journey to becoming a licensed pilot. EAA Video Player - Your Source for Aviation Videos -jeff
  19. Orrem31

    How hard or easy is it?

    I love flying my Quicksilver. I like to call it low speed high performance :) Quicksilvers do have fairly restrictive operational limits on wind and cross country travel. But for glassed off 20 minute evening flights they are just about the most perfect plane for me. I can drive myself to...
  20. Orrem31

    Interesting VP Derivitive

    Hmm... Sure is pretty, but that's a lot of sawbucks for a useful load of 430-550 lbs and 95 kts max speed. -jeff
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