Kaos1

OK, who's turning the most revs and with what combination of engine or e-motor and prop? What kind of thrust / speed is that producing? Exclude fans, this is a propeller driven forum.

Kaos1

evan-RCU

You're not asking for much are you? Want our little speed secrets too?......

ewstap

Yeah! I want to know alllll your secrets!!

evan-RCU

First secret no Stapula's!!!!

daven

My Feedback: (1)

your standard Nelson .40 Q40 motor will turn a 8 pitch prop at roughly 23,000 rpms and close to 3 H.P.

evan-RCU

All depends on type prop, fuel, altitude, etc...

Kaos1

I've heard of some electrics turning over 30K. Seems as if the prop tips are near supersonic.

samuelx

Hi my favourite hobby is fly fast planes. I have some F5D Avionik, and F3D planes also. I am using Avionik with 18 x gp1300 and about 60A. Motor is hacker B40 11L it turns 4,75"x4,75" APC about 38000 rpm.
F3D planes have about 6,7"x8" prop. My hand made IR (Ravil Ibragimov) motor turns that prop about 32000RPM top speed is about 360 km/h

MarkF

I am turning a 7.5 X 8 carbon prop at close to 32000 on the ground. Not quit sure were it unloads to in the air. Plane is an older F3D stiletto. My motor is electric. Im using a Neu 1521 3D and a 12s 3700 lipo battery. Those who went to the last Revvers rabbit dry lake event got to see it fly. I also have a smaller elctric F5D plane 40" wing that will spin an apc 4.7 X 4.7 prop at over 40000. If you wish to go electric then tell us your plane and I will try to help you make it go fast.

Mark

samuelx

Both of those my setups are FAI legal.
Me and my friend are building fast (not fai legal) planes for next summer. I am going to use IR motor with nitro, and smaller plane (Fai planes are about 180cm) My friend is building F5D Bathlet for many 5000mah lipos, and big e-motor. Target speed are aroud 400km/h.

EDIT... here is a video for my FAI leagal F3D model:
http://www.youtube.com/watch?v=ZVs4NEtYnM4

evan-RCU

I'm looking at getting an Ikarus Cheetah, running a 4.75x4.75 on a Kontronix Microdancer on 3 cells I'm told 30k + rpms is what to look for. What set up are you getting the 4.7x4.7 to 40k rpm with? What kind of mph does this give you?

http://www.icare-rc.com/cheetah.htm

MarkF

I am running a Neu 1115 1D motor on 9 2200 nimh cells. This will get you close to 37000 but now Im going to switch to a 3s 4900 lipo battery which will get me closer to 50000 at the prop. Speed should be close to 200 mph now. This is on a F5D cyclone plane.

Mark

evan-RCU

motor calc comes to 36k rpm with that what are you doing to get 50k?

Cyclic Hardover

My Feedback: (3)

I'm guessing I must have turned upwards of 30k a year back on my Jett 90 when the prop came off on the back stretch and blew the connecting rod![X(] Installed a new one and been fine ever since.

Desertlakesflying

My Feedback: (28)

I have to run a 15X7 3blade at nearly 5000 feet to get 100mph on my Hangar 9 Mustang with the OS 120 pumper

MarkF

Evan, I dont know what your doing wrong but I get 475000 on a 4.7 X 4.7 , and just over 50000 with a 4.5 X 4.1. Try going to Neumotors.com and use his calculator. I doubt the 1115 1D [5700 kv ]motor, the 4900 3s Neu batteries are even in motocalc.

Mark

Kaos1

I've got a Race Rat new in the box. Some of these motor sound like they could rip the guts right out of a plane. Not sure what a good set up would be...

Kaos1

combatpigg

My Feedback: (3)

I bought a full piped GZ .061 from Bill Hughes a couple of years ago and it turned a APC 4.2x4 at 42,000 rpm. That is 700 piston pops per second. The 14 oz. model accelerated out of my hand faster than anything I've ever seen, forget about cavitation. The cost in spent time replacing parts for this kind of performance is high, and parts for this series crankcase are no longer available. The newer GZs must be at least as good as my old one. 42,000 rpm sounds totally Satanic, "unworldly" when it jumps on the pipe. There is roughly a 10,000 rpm jump when it hits resonance. If you want try one out, give Bill a call and he will fix you up.

For about $200, you can get a Cyclon or Fora .061 and run 32,000-36,000 all day on low nitro fuel. these engines are easy on plugs, hold a steady needle, and I've never even had the backplate off of mine, [after 4 years or so of ownership]. On a small enough model, these engines can really produce some excitement.

Kaos1

Is this realistic or is it a set up that will let the smoke out of the motor, ESC, or battery?