RE: Extreme Flight Extra 300, 50cc, 88.5inch Wingspan, Build !!!!!!!

RE: Extreme Flight Extra 300, 50cc, 88.5inch Wingspan, Build !!!!!!!
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RE: Extreme Flight... - 5/23/2008 1:00:39 PM

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Joined: 11/1/2004
From: Oxfordshire, UNITED KINGDOM
Status: offline

If you have any paint that needs stirring use the TBM prop, ditto with a Zinger..

(in reply to Rush7)

RE: Extreme Fligh... - 5/23/2008 2:26:53 PM

3high

Posts: 21
Joined: 1/18/2008
From: Winter Springs, FL, USA
Status: offline

Thanks for all the input guys. I have noticed that the clear coat on the TBM prop is flaking off. I'
ll also try leaning out the low end a little to see if that helps. Where can I purchase a vess prop and which one
for breaking in the DA?

(in reply to wavy777)

RE: Extreme Fligh... - 5/23/2008 3:45:05 PM

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Joined: 8/11/2003
From: Milwaukee, WI, USA
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If you're actually measuring your CG location, make sure to measure at a right angle to the centerline of your fuse or your measurement can be off. If you measure on the ground as most people do, you will measure relative to the ground - but your fuse is at an angle. This is something I noticed when I was doing it.

I used a triangle I got from Home Depot to measure mine. I put one side of the triangle parallel with the fuse centerline (use the covering edge as a guide)....I butt the other side of the triangle against the leading edge of the wing at the root...then I put a ruler against the same side of the triangle and take my measurement. Since a small distance of CG change can have a huge impact on how the aircraft feels, I feel it's important to measure it accurately.

Edit: And I feel it's very important to report your CG accurately here since it helps other people to get theirs right the first time...or very close.

< Message edited by JoeAirPort -- 5/23/2008 3:46:44 PM >

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(in reply to 3high)

RE: Extreme Flight... - 5/23/2008 5:37:14 PM

yarom

Posts: 1186
Joined: 6/23/2005
From: Bellevue, WA, USA
Status: offline

I agree on the Zinger, but the TBM props are much better than that and if you compare them to other brands, such as Xoar and NX, they are rather identical...

You can add JXF to the Zingers - rather poor quality wood.

quote:

ORIGINAL: wavy777

If you have any paint that needs stirring use the TBM prop, ditto with a Zinger..

(in reply to wavy777)

RE: Extreme Flight... - 5/23/2008 6:39:14 PM

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Joined: 9/29/2003
From: surrey, BC, CANADA
Status: offline

I've got a small 16x6 JFX,I really like it for my 1.20 aplication.Its been mentioned that the JFX is the same as a Xoar and one other brand?

(in reply to yarom)

RE: Extreme Fligh... - 5/23/2008 6:53:57 PM

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Joined: 8/11/2003
From: Milwaukee, WI, USA
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I doubt JFX is the same. JFX compresses really bad. Xoar doesn't as much. Menz barely compresses at all. JFX isn't a bad prop from my experience. Just not as good as Xoar or Menz.

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(in reply to nitro wing)

RE: Extreme Fligh... - 5/23/2008 11:57:28 PM

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Joined: 9/2/2004
From: marana, AZ, USA
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quote:

ORIGINAL: 3high

Thanks for all the input guys. I have noticed that the clear coat on the TBM prop is flaking off. I'
ll also try leaning out the low end a little to see if that helps. Where can I purchase a vess prop and which one
for breaking in the DA?

da sells the vess props, and they should no which one for you to use, haha, i think you can get them from vess aero web site, not sure

(in reply to 3high)

RE: Extreme Fligh... - 5/24/2008 12:13:53 AM

3high

Posts: 21
Joined: 1/18/2008
From: Winter Springs, FL, USA
Status: offline

Today I checked the balance of the TBM prop and it was way out of balance. I actually went and picked up a new xoar 22*8, put it
on the balancer and was pleased to see it was almost perfectly balanced.

(in reply to diamondave)

RE: Extreme Fligh... - 5/24/2008 2:44:41 AM

Posts: 63
Joined: 4/17/2006
From: Kirkland, WA, USA
Status: offline

Got a chance to test fly with cg at 7.125. Result was 14 ckicks down to 7 clicks down on elv. Moved Cg to 7.25 to reduce elv trim. Result no change in elv trim and tail was getting sensitive. 45 inverted was climbing. I was slightly climbing at 7.125.

I think I am chasing the wrong animal here. I think I should be looking and adjusting down thrust instead of Cg. even with the cg back so far if I come in slow and increase throttle nose wants to go down. Currently thrust line is at zero, So I think I need some down thrust but how much? also a some more right thrust cause plane still veers left alot in up line even though I am balanced laterally.

(in reply to 3high)

RE: Extreme Fligh... - 5/24/2008 2:57:09 AM

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Joined: 1/3/2008
From: kansas city , MO, USA
Status: offline

So you used the template for the engine mounting right ? What engine are you using ? Are the standoffs the correct length ?

With the CG so far back the plane will float tail heavy - as you increase throttle it WILL pitch down, that is normal. Do not screw with the engine mounting yet, try to get the CG dialed in right to a factory specified range of 6 - 6,3/4 then if the plane is still behaving wierd maybe consider changing the engine position. It think it is premature to mess with the engine thrust angles while the plane is almost 1/2 of an inch outside of the normal CG.

(in reply to zoomer199)

RE: Extreme Fligh... - 5/24/2008 3:11:17 AM

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Joined: 5/22/2005
From: Bear, DE, USA
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At both spots if the plane is climbing on an inverted 45 upline then you are way tail heavy... you need to get your CG straight first.. then look at the thrust.

The factory position is a great starting point but you will always have to add up or down thrust plus possibly some right. They is all relaztive to the engine and the prop. Just using a different prop will show you that you need different thrust.

After your CG is right then go along at half to full throttle.. cut it to idle and see what the plane does.. from that point it should fall off on a nice arc.. if it suddenly ballons you need some down thrust if it dives you need up thrust.

You need to change things one at a time.. too many changes at once will prove useless because you cant see what is effecting what.

< Message edited by Jake Ruddy -- 5/24/2008 3:19:03 AM >

(in reply to 6Packo Beer)

RE: Extreme Fligh... - 5/24/2008 3:18:54 AM

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From: Kirkland, WA, USA
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Thanks 6pack, In previous posts you can see at factory range nose drop is in level flight is alot and elv has about 0.187 of down trim for level flight.

Yes iI did us the engine templete for a da50. Had it left over from my EF yak 88. Used the right line on fire wall (not center Line) for templete center.

(in reply to 6Packo Beer)

RE: Extreme Fligh... - 5/24/2008 3:26:21 AM

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From: Kirkland, WA, USA
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I here you Ruddy, My plan is to restablish cg using 45 deg inverted testing then move forward with down thrust. then move forward with right thrust.

By the way running da50 with pitts muffler and vess 23A. I perfered 23B on my yak but it died with the plane. 23A seems ok on this airframe so far.

(in reply to zoomer199)

RE: Extreme Fligh... - 5/24/2008 3:27:58 AM

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From: Kirkland, WA, USA
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Has any body else had to play with thrust line? If so what where your angles.

(in reply to zoomer199)

RE: Extreme Fligh... - 5/24/2008 3:41:34 AM

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From: Bear, DE, USA
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So far my thrust is actually pretty darn close. I will be spending the next 3 days extensively trimming my plane so I will know more after that.. but from what I have seen before I needed 2-3% mixes on al. and el for perfect flat turns and KEs are reacting almost the same. Thrust itself seemed fine but I haven't had a nice calm day to try it multiple times.

Will share more MOnday night.

Since your plane is so tail heavy its going to require down to keep the tail up... so when you get on the throttle the el. are going to start doing what they are trimmed at.

< Message edited by Jake Ruddy -- 5/24/2008 3:42:38 AM >

(in reply to zoomer199)

RE: Extreme Fligh... - 5/24/2008 4:44:42 AM

Posts: 63
Joined: 4/17/2006
From: Kirkland, WA, USA
Status: offline

Understood Ruddy. I need to start over and go step by step. I will start with bench cg at 6.5 since that seems to be what most are at in this thread,and go from there via flight testing if the