is this Aeromarine SprintCat 36???? need advice on motor and prop

[srislash]

Williams racing makes inexpensive rail mounts. I'd go at least a 4092 Leopard.

That is a 35" cat.

[aminoacid]

ill have to wait for the 4092 to come instock again. 1390kv.
Serpentine suggested these props, maybe m445 or x447 and check your temps , anybody agree or disagree?

[Serpents811]

ill have to wait for the 4092 to come instock again. 1390kv.
Serpentine suggested these props, maybe m445 or x447 and check your temps , anybody agree or disagree?

With a motor like a 4092 1390kv you might be able to spin a bigger prop than suggested previuosly

[NativePaul]

Might be able to, but as always with FE, start with a small prop and work up from there, mine has a 1521/2.5D 1200kv on 8s and use from X438-M646 depending on what I want out of it. 1390kv on 6s is a little lower RPM so you should be in that range assuming that leopards run a little hotter / less efficiently than Neu.

[aminoacid]

Speaking 120 or 180 esc? Let's say 6s2p

[aminoacid]

bump
180-240 perhaps. how do we choose the correct size esc>?

[JIM MARCUM]

Looks like a Sprint Cat Turbine nitro hull. A leopard 4090 409 2/2Y is rated at 125A, 25V, 4200W, and 1390KV. With 6S2P it would run 30,858 RPM, and with the right prop & setup you should see 60+ MPH.

I suggest you use an offset rudder or it will handle squirely in the straights due to propwash effecting the strudder. JIM

[aminoacid]

what about prop suggestions?

[JIM MARCUM]

No. But, there a a lot of more experienced guys on OSE that can help. Send a PM to Fluid, Rumdog or Properchopper. JIM

[Fluid]

Here's my build, low 60s but high amp draw. Very reliable: Neu 1527/1Y, Schulze 32-170, 6S2P/4500 FlightPowers, worked over x455. The trim tabs are for SAW racing only.

[JIM MARCUM]

Cool cat Jay. Questions:
1. I don't get why the trim tabs for SAW racing?
2. Are you REALLY still using an FM radio, or do you just like long antennas?
JIM

[Fluid]

That photo was taken in early 2008, when I built the cat - still had the 75 mHz radio back then because the Spektrum radio I used for oval racing didn't have the range for the long Legg Lake run-ups. If I told you why we used tabs on SAW cats I'd have to kill you......












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[LarrysDrifter]

I think I might know why you use tabs on SAW cats.....the answer seems obvious, but Ill keep my opinion to myself.

[JIM MARCUM]

Geez Jay!!! Thats a bit harsh. How about you send me a PM and I'll trim my fingernails instead?

And Larry, I've never known you to keep your opinion to yourself before - so what's so "obvious" about tabs on a SAW cat? JIM

[Fluid]

How about: "if you have to ask then you are unworthy"?




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