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  1. F

    Rotax 912 Isolator mount details

    I’m working on the engine mount for my Rotax 912 powered project and am trying figure out the attachment of the ring mount to the engine frame. Does anyone know what length the “distance tube” shown below is supposed to be? Thanks!
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    Engine offset angle for P factor

    You are right. I should just say for all propellor induced left turning tendencies - I am wondering if I need to correct. Sounds like as my tails are out of slip stream, the actual p factor is the biggest one, Which is more pronounced in climb so I’m inclined to keep the motor straight.
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    Engine offset angle for P factor

    Thanks all - just to clarify - this is a custom scratch built. It has twin tails like a Cessna Skymaster - so the swirling effect on the fin and rear fuselage should be minimal. So I'm thinking the offset should also be less than one would see on a conventional configuration like a Comanche...
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    Engine offset angle for P factor

    It's about time to start fabricating the engine mounting frame for my project (Rotax 912 powered LSA - high wing, tractor configuration). I believe it's fairly standard practice to have an offset angle to account for P factor & torque. Can anyone suggest any sources to recommend finding out...
  5. F

    Painting composite interiors

    That’s the stuff. Thanks all
  6. F

    Painting composite interiors

    Does anyone have any advice for painting composite interiors? I’ve seen glasairs and Ezs with that grey speckled finish but not sure what it is or how to do it. Need something durable that does not show off all the features of the bag side... Thanks
  7. F

    Landing gear loads?

    Pazmany gives steel spring efficiency of 0.5 and rubber of 0.6 - so he thinks you are right.
  8. F

    Landing gear loads?

    Thanks all - it looks like the LSA ASTM in this area is just a copy of the old part 23, which is much more descriptive and clear. I can figure it out from there. Yes - planning to use Grove - but the landing gear is only as good as what it is bolted too!
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    Landing gear loads?

    On the subject of landing gear loads, hoping someone can help here: I'm following the LSA ASTM for my scratch built project and am struggling with the gear loads. I'm a professional aerospace engineer, and I still can't figure it out. What are they getting at with the variable "h" noted...
  10. F

    Flaperon vs Wing Deflection

    Thanks Billski - all good points. I’m going to set up a proper load test and see how it looks. If it’s still not acceptable Plan B is to split the Flaperon and put a joint in there. Not a huge deal. Will be a while before the test is set up but will post some results on here when I get them.
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    Flaperon vs Wing Deflection

    Thanks all. To answer some of the questions: - Hinges are all restrained laterally - It's roughly 0.5" deflection at center - Airplane cruise speed is 115kts - For this quick test - the left wing is supported by saw horses at each end and loaded in the middle from the top to simulate up...
  12. F

    Flaperon vs Wing Deflection

    Blane: Flaperon is unloaded. The load on the flaperon is pretty minimal compared to the wing. According to the attached figure from the LSA ASTM, my flaperon load will be about 200lbs at max g - so for the test I did not put any load on it.
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    Flaperon vs Wing Deflection

    I'm in a bit of a jam - quite literally... My airplane design has a cantelever wing and full span flaperons with a very similar layout to the RV12, except they are slotted. Each flaperon is about 10ft long with three hinges - one on each end and one more in the middle. The hinges are spherical...
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    How much room behind a Rotax 912 ULS?

    I appreciate the responses. Based on these and some pictures of other airplanes, I'm going to go with 7" from the aft of the ring mount to the firewall. Will let you know how it works out!
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    How much room behind a Rotax 912 ULS?

    Thanks - the drawings are helpful for the dimensions of the engines. However it is all the ancillary bits (oil tank, battery, hoses etc) that are not included on the engines that I am concerned with. Anyone have any thoughts?
  16. F

    How much room behind a Rotax 912 ULS?

    Quick question for anyone with Rotax 912 experience out there. I'm doing a clean sheet design and need to get the firewall details nailed down. I'd like to know what people recommend or have in their airplane for the minimum spacing behind the engine mount and the closest part of the firewall...
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    Anyone seen this before? Mold surface problem...

    I've made several molds now for my project and thought I was getting the hang of it until this happened... The surface of the tooling gelcoat is severely wrinkled in some places. At first I thought it was because I liberally applied the PVA "backup" release agent when it was pretty cold (~45...
  18. F

    Flaperons to increase cruise speed

    I'm using the good old 2412. Here it is with 5 deg reflex: Would you consider this suitable?
  19. F

    Flaperons to increase cruise speed

    Thanks for all the replies. Based on some of the comments here and thinking about it more, clearly flap reflex reduces Cl. This reduces drag based on this formula: Running a XFLR analysis of my foil with a 5 deg reflex gives an average Cl change (over 0-2 deg AoA) of -0.16. Plug this into...
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    Flaperons to increase cruise speed

    So can any Kolb or glider pilots share what sort of speed increases they get from flap reflex?
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