Hoping to try it tomorrow

[Dragon Master]

all harley logos
13 in wing span 11 in long

[fhhuber]

CG as % MAC? I suspect 'tis a bit aft of where it belongs (just looking at motor and battery placement) Appx 15% of the wing area (including the elevons) should be ahead of CG.

Elevons are a bit large... low throw or lots of expo.

That huge fin area looks a bit forward for good yaw stability. May want to cut a V in the elevons and make a rudder.

I think it will fly as is... but I think it will have some stability issues.

[JetPlaneFlyer]

Originally Posted by fhhuber

CG as % MAC? I suspect 'tis a bit aft of where it belongs (just looking at motor and battery placement) Appx 15% of the wing area (including the elevons) should be ahead of CG.

+1
by eye i'd guess the CG would need to be roughly in line with the leading edge of the wing at the tip. As all the heavy components are well behind that point you must be VERY tail heavy.

Best way to be sure of the 'flyability' of an unusual shape like this is to make a small 'chuck glider' out of some thin foam or card or balsa. You can adjust the CG until it flies rather than tumbles. Transfer that CG to the RC model.

[Dragon Master]

CG 3 3/4" from the nose excluding the motor about 1/4way from the front of the battery total length of 11"

[fhhuber]

If it immediately noses up and wants to hover... Do a V-Stol landing.

I had an E-Flite Foamie Ultimate (discontinued) that was like that... CG by instructions and it took off into a stable hover hands off. Moved the CG and it was a nice flying airplane.

[Dragon Master]

Give her a try all it wants to do is circle to the left give it more power just flips upside down mover CG ahead 3/4" still acts the same

[fhhuber]

The side area is too far forward. Kind of expected that as noted above.

Lots of side area... so you'd think it would track well, but because you don't have enough "fin" at the rear and the swirling of the propwash you get circles.

Cutting in rudder you might be able to correct it... or maybe adjusting thrust line.

don't give up... it can be cured enough to be controlable.

[Dragon Master]

Originally Posted by fhhuber

The side area is too far forward. Kind of expected that as noted above.

Lots of side area... so you'd think it would track well, but because you don't have enough "fin" at the rear and the swirling of the propwash you get circles.

Cutting in rudder you might be able to correct it... or maybe adjusting thrust line.

don't give up... it can be cured enough to be controlable.

sorry quite new to all this just started last year

So i have to ask what you mean by adjusting the thrust line
Im assuming you are talking about moving the motor is so what direction would you suggest

I will try to add a rudder
any idea why when i get it off the ground it just flips over

[fhhuber]

All the weight is above the wing making it want to flip... move battery and RX below and it will help.

No dihedral it give it positive roll (adds to the pendulum effect of having weight below the wing) yaw stability. That is not as big of a factor. If you plan to fly inverted a lot then you really don't want the dihedral.

To adjust the thrustline put one washer under the X mount at each of the 2 legs it is turning toward. Test and see result. If it helps but needs more add another pair of washers.

Its normally best to make one change at a time and then test for the results when experimenting.
In your case we know you need to move weight down so do that first.
Weight and balance issues always come first.

Occasionally when a plane is doing a lot of strange stuff I'll make a few changes all at once but it can make it hard to determine which changes helped and which ones hurt.

Experiments like this can be fun. They are frustrating at times but you learn from them.

[Dragon Master]

Thanks so much I have always loved to build one thing or another

I am always determined to make things work one way or another
Had to glue the one wing. Will move the battery to the bottom side.
Hope to play again later tonight
Never knew there was so much to lean and loving it

[Dragon Master]

Had no luck broke her into 5 pieces
Think i will try a more conventional build and once i have more experience under my belt give that one another try
Thanks for the help

[fhhuber]

Select a different logo for the side view of the fuselage on the next try... one that puts more area to the rear instead of lots in the middle and none at either end.

It will help.

I still think the build you had could have been made to fly reasonably well though.

[Dragon Master]

Originally Posted by fhhuber

Select a different logo for the side view of the fuselage on the next try... one that puts more area to the rear instead of lots in the middle and none at either end.

It will help.

I still think the build you had could have been made to fly reasonably well though.

Going to give 32" Yak a try I think the all the parts will work fine http://www.rcgroups.com/forums/showpost.php?p=11081098
C2024 Miccro brushless outrunner 1600KV with a 6X4 E prop
http://www.hobbyking.com/hobbyking/s...idProduct=5381

if there is anything you thing may fit that motor and prop better please let me know

I havent given up on the harley logo, just putting that one on the back burner till i get more experience

[fhhuber]

Before we go further...

How much flying experience do you have?

[dgjessing]

Anything with a Harley logo is going to need to have parts falling off of it from time to time, lots of leather fringe, leak oil, etc. Maybe a PTO shaft... Heavy, I'm thinking

[Dragon Master]

Originally Posted by fhhuber

Before we go further...
How much flying experience do you have?

I been flying for a year now, fly a supper cub and a apprentice
I have been doing a lot of reading
Pretty much a newbie

[fhhuber]

I'd have to watch you fly the apprentice before saying if the Yak is a good idea or not...

The Yak can be adjusted to be mild or wild, but it has no "self-correction" for when you make an error.