UL-1 prop question

[lincpimp]

Hey Guys, need some help from the pros!

I just acquired a UL-1, it has a 6xl in it, and I plan to run 4s lipo. Not looking for a speed demon, 50mph max.

Looking at props, the octura x438 looks to be about right, but I wounder if the Grimracer L38x55 would be a better choice. They appear to be very similar in spec.

I see that the grimracer is listed as a lifting prop, and I thought that was what you had to use on a hydro (this is my first hydro) but I also see that the UL-1 runs the same prop that the supervee does stock, so I am a bit confused...

Please steer me in the right direction, I just put around the local pond, so good temps and runtime beat speed for me!

Thanks!

[Fluid]

Unfortunately your setup is not going to be reliable, cool running or have very much run time. The Feigao 6XL has a Kv of 2779 and will spin around 41,000 rpm with a reasonable amp draw on 4S. With an x438 prop you'd be running around 67 mph - way way way too fast for that boat to stay on the water. Expect to be buying ESCs regularly too.

You could run 3S, but then you'd need a different ESC. You would be far better served by getting the original UL-1 motor and selling the 6XL. Sorry........



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[lincpimp]

I do not have the stock UL-1 speed control, so I can run 3s. Not a big fan of low voltage setups, but I do have a pair of 4500 30c 3s polyquest lipos that I can run in parallel to get some runtime.

Would the x438 prop be suitable for use with that motor on 3s?

I know a lower kv motor and 4s would be preferable, but I do not mind doing some experimenting! Now that I am looking, a suitable 4s motor with around 1800-2000kv, correct

[jcald2000]

With the new batteries I would look for 1500 rpm/v max

[domwilson]

Isn't the stock motor 2030kv?

[domwilson]

http://www.offshoreelectrics.com/proddetail.php?prod=dh-aqug7001