4s Cheetah prop options

[chipgibbs]

I recently finished a FighterCat Cheetah and have had it in the water once.
The build specs are: Leo 4082-2000kv, Seaking 180 and 4s2p .
I have run it with an m545 and am wondering what other props I should try.
I found no heat over 100 degrees after the maiden run.

Thanks for any advice


Chip

[Chilli]

What kind of speed did you get with the 545?

Even though temps are good. I would be very cautions going too much bigger in prop with the 180. I've got a 447 you can try for giggles.

[chipgibbs]

chilli,

I didn't have the GPS in the boat but, I'd estimate, about 45mph.
The Revolt has an 1800kv motor on 4s and this Cheetah has a 2000kv 4082. It should be faster. I just haven't had enough time in the water to get it sorted out.

I might find some water tomorrow for a run or two.

Chip

[properchopper]

Chip,

I built a Cheetah for a customer with the Leo 4082 2000KV and a T-180 run on Dinogy 4S2P 5000 65C/130C packs. With an Oct 447/3 he went 57mph on the GPS but the T-180 was 165 deg. We switched out to a CC 240 and temps calmed down even after 4 minutes.

My Cheetah with a Neu 1521 1.5D (1900KV) and a FCR 240A esc and the same packs and the X447/3 with no temp issues was near that speed by my estimate (I forgot the GPS) and next run I'm going to a 450/3 since I run that same setup in my 34"mono without issues.

I have the prop up @ 3/16" off the sponson bottoms and + 3 deg to lift the hull out under power. Love those full throttle wheelies !!!

Got bored yesterday (rained out) so added some tailfins

DSC03911.JPG

[chipgibbs]

Tony....I copied that build. Not ready to shell out more money for a new ESC.

Thanks for the response, I'll try the strut adjustment with the 447/3

Chip

[properchopper]

Here's how I have the strut adjusted for the 450/3 (447/3 in the picture). The higher the strut, as long as the blades get adequate bite, the less load on the motor/esc/batteries. You can, if you listen carefully, hear a properly venting prop.

DSC03914.JPG

[Chilli]

Here's is what a properly vented prop sounds like.............sorry, couldnt resist.

http://www.youtube.com/watch?v=xQF1aIC_xBA

[properchopper]

Here's is what a properly vented prop sounds like.............sorry, couldnt resist.

http://www.youtube.com/watch?v=xQF1aIC_xBA

And one more (Mike, this is for You, - hope you're not missing her anymore but still the NAMBA P-Ltd Offshore Record holder if it'll make you feel any better )

http://www.youtube.com/watch?v=dOPTQrj-0RM

[Chilli]

I'm missing her but no regrets on the sale to you. Glad your putting her to good use!!

[chipgibbs]

Yup, That's how I want this Cheetah to run.

[stadiumyamaha]

I've had great luck on a similar build with a x642. It's normally my go-to prop for a new 4s build. Jmo

[chipgibbs]

So I've been to the pond and clocked 47.2mph with the 447/3. Kind of a base line. Now to start making adjustments.

Chip

[chipgibbs]

Tony & Chilli

I just noticed that the rear ride pads on the Cheetah hull are off the table 1/16" when the other 4 are touching. In Tony's set up photo, you can't see this.

Should the strut adjustment be above the table? OR above the rear most sponsons?


Chip

[Chilli]

Hmmm. On my cats I want all the ride surfaces flat on the table. Some blueprinting might be in order. We'll see what Tony says.

[chipgibbs]

Ran it again this afternoon with strut raised a bit & a little positive angle. I also had the gps in it but, I flew it too fast and end overed. By the time I got the boat back,
30 min, The gps was off.....don't know why yet.

IMAG0864.jpg

Chip