Prop size for my Radian?

[david 7]

Hi im looking for some advise on porp size, i have a super cub the motor and radio gear have up graded to a park zone 480 brushless 960 kv from my radian model, the motor is fitted to the stinson,f4u,t 28d, p-47, they use a9.75x7.5 prop,and a 30 amp e flight pro esc and 3s 1800 mah lipos the same as i have,

i am not to sure what prop size to use i have some 10x6 and 9x6 props i can try but i do not have a watt meter, can not find much spec on this motor but what i have found is,

 

park zone 480

 

prop volts amps watts rpm thrust efficiecy

apc 10x5e 10.6 14.1 149 8012 960g 78%

gws hd1060x3 10.5 17.2 180 7550 1113g 75%

apc 11x74 10.7 22.4 241 7218 1178g 70%

 

 

kv 912 rpm v

in 1.0 amps

rm 0.122 ohms

wt 105 grams

 

can any one advise me as to a sutible prop as i dont want it to be to fast and would like about 10- 12 mins flight time and not to over load the speed controller, nice and slow with a long flight time

 

thanks dave.

 

[Steve W-O]

It seems very heavy for the plane.

 

How big is your super cub? The one we have is quite small, and a 50g motor is more than enough.

 

I think there are going to be a lot more questions to give any sort of valid opinion.

 

 

 

Edit: At a guess I would think you would be better with a 40-50A ESC.

 

If you fit a smaller prop to lower the current, you won't get the duration.

Edited By Steve W-O on 21/04/2011 10:49:40

[david 7]

ths model is a hobby zone super cub, the the weight of the new motor, mount etc, is lighter than the original gear installed, you may be thinking of the smaller super cub,

[david 7]

hi do edit the topic to prop size

[Steve W-O]

11 X 7 would be a good guess.

 

The internal resistance you give is about twice what is typical for that size motor (3536)

 

That does mean it will draw less current, so your ESC and battery would be able to cope.

 

I use a 3536 on a model over twice that weight, but it is more powerful.

 

Still only an estimate, based on what you have given.