Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Diamond Dust Trimming

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Old 01-07-2003, 06:02 AM
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Bob Payne
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Default Diamond Dust Trimming

ok experts out there.
I have a Diamond dust again, i put an la46 on this one
my 46fx has destroyed a couple planes lately because of speed.
problem now is i can be about 1/4 throttle with dust its all trimmed out flying level
then i jam the throttle WOT
it takes off like a rocket what i mean by that also is it heads straight up in a steep climb will eventually start over inverted.
plane is perfectly balanced on front spar may be just a hair tail heavy without any nose weight.
my question is does the engine need to be washered up in the rear or should i first try to get it a tad nose heavy.
when plane lands with it trimmed for level flight sitting on bench elevons are perfectly straight back.
also for an la46 10x6 prop i launch it by holding it behind fins and just let it go it pulls right out of my hand nicely.

Thanks
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Old 01-07-2003, 12:34 PM
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nun45
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Default Diamond Dust Trimming

sounds like your mont is installed with up incidence. washers uder the back lugs should help a lot. can't recall any of mine ever doing that so i am guessing.---henry
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Old 01-07-2003, 02:29 PM
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tomr-RCU
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Default Diamond Dust Trimming

Probably a combination balance and engine incadence.

Put a couple washers under back of the engine, and move the cg back a little. The CG on the DD is very forgiving and can be moved back an inch or more without losing stability.

Tom
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Old 01-07-2003, 07:37 PM
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Default Balance

Your CG should be right on the front spar. With that balance point your elevons should be very close to level, meaning perfectly streamlined with the wing. The Dust normally does not fly with any up elevon.

It sounds like your Dust is nose heavy which requires a certain amount of up trim or up elevon for level flight at 1/4 throttle. As soon as you hit full throttle and increase speed the up elevon causes the pitch up.
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Old 01-07-2003, 07:51 PM
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Bob Payne
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Default Diamond Dust Trimming

the elevons are level at 1/4 - 1/2 stick
and i rechecked it just now if i put 1/2 ounce
of lead behind engine plane is perfectly balanced
on fron spar.
if the weather works for me tomarrow i'm gonna try
a different battery and put it inbetween the elevon
servos
right now i have a 1100mah battery 4 cell
i'm gonna put my 280mah battery in and see what happens
i just wont be able to fly 10 tanks of fuel between charges.
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Old 01-07-2003, 09:11 PM
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Default Elevons

Bob,

I'm not sure what you mean by "1/4 - 1/2 stick."

Your elevons should be level with the transmitter stick at the neutral position.
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Old 01-07-2003, 10:41 PM
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Default Re: Elevons

throttle is 1/4 - 1/2

Originally posted by Dustflyer
Bob,

I'm not sure what you mean by "1/4 - 1/2 stick."

Your elevons should be level with the transmitter stick at the neutral position.
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