Steve_S-RCU

Hi,

I am almost done building my Bob Campbell T-38 which I kit bashed into a F-5. My question is it too heavy to fly? I found that the nose is very heavy and requires 1 lb and 7 oz of lead in the tail to balance the aircraft. I would like to here from people that are fly prop jets if they think it will fly or if I should make changes. If so what??


Here are the specs:

Wing span 56 inch
Wing area 575 sq inches
Wing loading ~ 48oz/sq ft (I think the plane will weigh ~11.5 pounds)
Engine Magnum 0.52
Prop APC 10x7

Thank Steve

smoknrv4

My Feedback: (11)

Sounds heavy, for that size model, models in that size catergory generally weigh about 6-8Lbs I think, you may need a lot of runway.

angelrcdesign

My Feedback: (40)

Hello there

You will need a Bigger Eng for that .
Webra .60 rear exh. just make it flyable.
You need ,77 to .91 to fly that bird.

Have Pic in my Gallery This one has a Rossie 81 gets this plane going'

jaka

Hi!
Sorry! But it 's too heavy! Perhaps it will fly if you use a tuned pipe but not otherwise.
Lighten it and it will fly good!
Never ever put lead in a plane to balance it! Move or remove things to achieve proper Cof G!
Aim for a weight around 3,5-4kg!

combatpigg

My Feedback: (3)

What would you do at this point to balance an under powered plane that is ALREADY nose heavy and seriously overweight [with no ballast included]?
I think it is a very pretty prop-jet and it should be hung from a very select spot in the workshop.
I would not waste my time trying to fly it. There's too many other good planes out there to swap your gear into and have some real fun with.

Steve_S-RCU

Hi All,

Thanks for the input.

Angelrcdesign,

Your T-38 look to be about the same size as my F-5. What is its weight? What is it construction? Where is your CG? How did you get it to balance? Did you do it with only need equipment?

Thank

Steve

airraptor

My Feedback: (66)

you guys have it all wrong lol take the weight out of the back and then add a jett 60 LX to the front and the rear. This will take care of the power and get rid of useless weight.

angelrcdesign

My Feedback: (40)

The weight is (9) Light weight  balsa in the front but its a little soft, heavy stuff from the C/G back. and faom wing tail and rudder. I also add 3 inch
to the tail and took off 2 inch in the front. And the C/G was 3 inch back from the leadnig edge. ALL THE EQUIPMENT IS IN THE REAR and the fuel tank is on the C/G.   

I would like to see that done.  60 in the front and back.

I'am still working on my proto type for the .50 size.

Steve_S-RCU

Hi Angelrcdesign,

Thanks for the info. One more question, you said all the equipment is in the back does that include the aileron servo and flap servo?

angelrcdesign

My Feedback: (40)

The servos are in the wing  between the gear and the trailing edge.

Steve_S-RCU

Hi Angelrcdesign,

Thanks for the info.