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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

    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...
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    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
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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?

    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...
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    Flaperons to increase cruise speed

    I've heard and read that it is possible to get a higher cruise speed by deflecting flaps or flaperons a little Trailing Edge UP above nominal during cruise. Apparently some gliders, the 787 and the A350 make use of this effect. Can anyone explain aerodynamically why this is and offer any method...
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    Flaperon Hinge Moments

    Homebuilders... there are a few threads on this, which makes me feel a bit better knowing that other people are struggling with the same issues. However none of them can quite help, so maybe you can. Here is the situation: My design is an LSA with a fairly conventional high wing, but with...
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    Magic Airfoils... the mystery of the CTLS & Jabiru J230

    So whilst looking at some other LSAs in the course of working on my project, I noticed that a couple seem to have "magic airfoils". Jabiru J230 MTOW: 1320lbs Clean Stall speed: 45kts Dynamic Pressure: 6.87 psf Wing area: 102 sq ft Which gives a required Clmax...
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    V-n Diagrams

    I've got a question on V-n diagrams. But first, a quick update on the project. You may remember I sent out a survey in this thread. This helped refine the requirements. I have since completed conceptual and preliminary design. I am now getting into the detail design. It's a single engine...
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    Design an airplane!

    Hello all, I'm new to this site - but not so new to airplane designing and building. You can read my intro here. I've decided to start my own airplane project - and it begins with you - the homebuilding community. I'd like you to have the opportunity to weigh in on what's important to you...
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    Hello Homebuilders - Meet a new airplane designer.

    I've been reading many of the useful posts here for a while and thought I'd go ahead and register. A bit about me: I'm a professional aerospace design engineer by trade and a GA pilot for fun, living in the Northwest of the US. I spent the last 4 years building a Glasair SII. It was a heck of...
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