Eagler's Nest
General Category => Builders logs => Paul's DE/CE build => Topic started by: Kiwi55 on June 11, 2019, 10:55:24 AM
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As I had mentioned in my last post I need to increase the prop clearance (a lot). This is due to using a 68" prop on a Rotax 582. Having not thought this through ??? when I originally built the landing gear. I will have to build new landing gear.
I raised the engine 3" from my mock-up position, but I also need to raise the front of the airplane an additional 6" to give me 9" of prop clearance in a level stance. Oh well... time to get on with it. :))
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Always a pain to redo work you already completed. How did you determine that 9" was the amount of clearance you needed?
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I mocked everything up. Mounted the engine using an old engine mount. In level flight attitude I had less than 1" of ground clearance. I understand 9: is considered the minimum, and that is with flat tires and landing gear fully compressed. I mounted the engine 3" higher on the firewall and then added 7" to the landing gear. It's almost done :)...
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Is the prop shaft on the gearbox mounted in the up orientation...?
Gotta ask :emoji_u1f62f:
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It is mounted up. So is the engine.
The problem is that the plans call for a VW engine with a 54" prop (or there abouts) and I'm using a 68" prop.
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Here are a couple of links for prop calculators that look interesting...
http://godolloairport.hu/calc/strc_eng/index.htm (http://godolloairport.hu/calc/opc_eng/index.html)
http://godolloairport.hu/calc/opc_eng/index.html (http://godolloairport.hu/calc/opc_eng/index.html)
(https://media.giphy.com/media/l0IyaBYRjd5vvH0Hu/giphy.gif)
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For calculating prop pitch I use a calculator on Culver Props website...
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I have 4 in, in flying attitude, you would be amazed how high the tail has to be to get it to hit the ground
if you are in that situation - the propr would not be the concern - pick up the parts of the plane wouldf be the worry