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Old Jan 26, 2007, 06:40 PM
del
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north of Chicago
Joined Feb 2003
1,827 Posts
Quote:
Originally Posted by mnowell129
I've found that you need about 110 between the thrust line and the rotor. The model flies with the rotor tilted back about 15. It's just then a matter of fitting a fuselage that flies level placed over the rotor/motor arrangement, then selecting landing gear to hold roughly that layout or slightly nose high for takeoff.
If you build the model in the sketch it will probably fly but with the tail very low.
GT17 side view for perspective.
mickey
Good info mickey! Thanks...

As you can see from the previous message, my sketch didn't
include the rotor tilt-back that I knew I'd need. It was more of
a sketch to see what the profile fuselage would look like than to
sort out the angles.

But, let me see if I understand you correctly..

If I choose a reference line at 0 degrees to the horizontal stab,
tilt the rotor shafts back 15 degrees, and add 5 degrees of down
thrust, that adds up to 110 degrees. Will that put me
in the ball park??

Like this...

--del
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Old Jan 26, 2007, 07:12 PM
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Joined Nov 2004
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Quote:
Originally Posted by del
If I choose a reference line at 0 degrees to the horizontal stab,
tilt the rotor shafts back 15 degrees, and add 5 degrees of down
thrust, that adds up to 110 degrees. Will that put me
in the ball park??

Like this...

--del
yep
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Old Jan 26, 2007, 08:57 PM
iPhly R/C with iPhone
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Silicon Valley, Calif
Joined Jan 2005
1,723 Posts
Quote:
Originally Posted by del
The rotors will be tilted back at the
"wing" mount to give the rotor shafts about 15 degrees from the
reference line.
I would suggest that you tilt the pylons, not the wing. At 15 AoA, even that tiny wing will create a lot of drag, and it won't add much lift. To tilt the pylons back, you can use washers inder the front screws, or place a blasa wedge under them.
Quote:
Originally Posted by del
It still looks a bit extreme to me.
I'd go with what Mickey says. He has more experience than I do.
Quote:
Originally Posted by del
And should the CG be forward of the rotor shaft reference line?
Just the smallest bit, maybe 1/8". Start with the model slightly nose-heavy, and then as you get comfortable with it, move the CG so it's on the rotor shaft.

Ari.
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Old Jan 27, 2007, 07:53 PM
del
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north of Chicago
Joined Feb 2003
1,827 Posts
Great info all!
Thanks a bunch...

And, yep, Ari, the closer I get to committing to building, the more
things I think I'll need to be able to tweak...

--del
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