So I have a bit of an issue....
300 KV motor pushing a 15x7 prop is not going to pull my 60 size spitfire off the ground (18 amps draw on a 6S around 300 watts +/-). I can go 16 max diameter, but it leaves me not much room for error taking off. So if I jump to a 16x10, 6S, I assume the draw will increase, it should give me more watts per lbs. Correct? I think someone said that it should be 100 watts per change of pitch and diameter? The esc is 100 amp capable.
I really dont want to pull the motor out again and find a sub as its perfectly lined up.
Greg,
There is something wrong if you are drawing only 18 amps. EdEdge would call that a "nice idle". My Nooner draws that!!! Most 60's are between 400 and 500 KV. Yours is 300 and that is really low. It will need a fair amount of lumber to bring up the amps.
My (your old) .46 Mustang has a 14x 8.5 APC but it has not flown yet.
I have a 14 x 12 APC (new in package) which equates to a 15x10 versus your 15x7. Also wooden Zinger 15x10 which you can try. These props may get you up to about 700-800 watts, nowhere near what you need. Suggest 3 bladed 15" diameter with as high a pitch as you can get. Good place to look for these is at the upcoming 905 Squadron Swap meet April 22.
Frank
For comparison I run a Hacker A50-16S (365kv) on 6s with a 16x10 in that white Sukohi that you might remember.
I would suggest 15x10 (largest pitch apc makes) if this is the biggest prop that will provide ground clearance. If anyone makes a 15x12 that would be what I would try.
That is unless you go 8S! 8S would be the best solution (insert evil grin here)
Ed
I've been thinking.
Going on the kv alone my setup runs:
6s x 3.8v x 365kv so 8322rpm unloaded.
With just 300kv to get that same rpm it's going to take 7.3s:
8322rpm / 300kv / 3.8v is 7.3s
I really think this is an 8S setup and would likely give great performance on a 15 x 10 in a warbird that your going to want some pitch speed available.
Quote from: Ededge2002 on April 09, 2018, 06:39:59 PM
I've been thinking.
Going on the kv alone my setup runs:
6s x 3.8v x 365kv so 8322rpm unloaded.
With just 300kv to get that same rpm it's going to take 7.3s:
8322rpm / 300kv / 3.8v is 7.3s
I really think this is an 8S setup and would likely give great performance on a 15 x 10 in a warbird that your going to want some pitch speed available.
@Gregor77 ,
For a
lot less fuss, we could go for a ride in a full-scale Cessna 172S at 2400 rpm with a 76-inch Hartzell prop! And the FPV experience is amazing, and includes peripheral vision!!! 8)
Andy
For a lot less fuss, we could go for a ride in a full-scale Cessna 172S at 2400 rpm with a 76-inch Hartzell prop! And the FPV experience is amazing, and includes peripheral vision!!! 8)
Andy
And you dont have to wear those ridiculous looking goggles!!
Quote from: Ededge2002 on April 10, 2018, 12:01:31 AM
For a lot less fuss, we could go for a ride in a full-scale Cessna 172S at 2400 rpm with a 76-inch Hartzell prop! And the FPV experience is amazing, and includes peripheral vision!!! 8)
Andy
And you dont have to wear those ridiculous looking goggles!!
@Ededge2002 ,
You are way too kind!!! 8)
Andy