hk rc princess boat prop

[alfredos]

hello guys , need help to find out which prop I will need for a hobby king princess rc boat with a turnigy 3665 2400kv motor and 180 amp speed control with a 5000mAh 4s1p 20c battery? any help will be very appreciated.

[znus]

hello guys , need help to find out which prop I will need for a hobby king princess rc boat with a turnigy 3665 2400kv motor and 180 amp speed control with a 5000mAh 4s1p 20c battery? any help will be very appreciated.

Is this surface driven or submerged? Anyways, that's a pretty hot setup in a big boat. The hull itself calls IMHO for atleast a ~45 mm (surface driven) to get on plane smoothly but the medium sized motor spinning 35000 rpm probably want something way smaller. Try some plastic 40 mm, watch your temperatures and keep your fingers crossed it hooks up. If it does the speed will be more than enough for that big s*cker!

[Snowride]

Sorry to bud in but I would like some prop advice as I am building a Princess too. What is a good prop to start out with in my case. Surface drive, T180, 4082 1600kv on 6S. Should be a nice sleeper.

[alfredos]

hello, thanks for the replay, the boat has a surface driven prop, what will be the pich? and 45 mm or 40 mm? thanks

[znus]

@Snowride. I have that very same setup in a 31" cat and it does 60+ mph with a M645. In a Princess however I'm thinking X445 for some more bite. I wonder how that hull will like high speeds? I can't imagine it was designed for it but It'd sure be a sight for sore eyes

@alfredos. Start with 40 mm 1.4 pitch. http://www.offshoreelectrics.com/pro...d=ose-2bld-316

[Snowride]

I certainly am not looking for 60 but would rather underprop to keep things cooler and shoot for sub 50mph. At 60 I think the hull might delaminate. The largest prop I have is a prather 220 but I do think this is a little too small but then again may be a good starting point. Guess my question is, what size would likely be the best to achieve about 50mph on this setup? I saw this video a while back which tells me it does seem to handle quite well at speed. http://www.youtube.com/watch?v=nCSBMBxtJrI

[znus]

I certainly am not looking for 60 but would rather underprop to keep things cooler and shoot for sub 50mph. At 60 I think the hull might delaminate. The largest prop I have is a prather 220 but I do think this is a little too small but then again may be a good starting point. Guess my question is, what size would likely be the best to achieve about 50mph on this setup? I saw this video a while back which tells me it does seem to handle quite well at speed. http://www.youtube.com/watch?v=nCSBMBxtJrI

A Prather 220 would be a good start, yes.

Doing 50, counting backwards, a X442 would be spot on. But that's just theories and math. The small diameter might have some problems pushing that giant up to plane from a stand still. It seems the YT-guy was running a 47 mm prop on a 1620 kv 3660. That's asking for trouble imho. Actually you could run a 47 mm but do it on 5s. That would get you to ~45 mph and you'd have some nice headroom on volts on your T180 esc.

or

Keep your Lipos and get a 1320 kv 5692!

[Snowride]

A Prather 220 would be a good start, yes.

Doing 50, counting backwards, a X442 would be spot on. But that's just theories and math. The small diameter might have some problems pushing that giant up to plane from a stand still. It seems the YT-guy was running a 47 mm prop on a 1620 kv 3660. That's asking for trouble imho. Actually you could run a 47 mm but do it on 5s. That would get you to ~45 mph and you'd have some nice headroom on volts on your T180 esc.

or

Keep your Lipos and get a 1320 kv 5692!

I thought that was why he only did a couple of laps before stopping, Probably smoked the ESC IMHO. Option B is I can also use a Tacon 3674 1300kv on 6S which I have lying around.

[alfredos]

znus how are you, sorry to bother you again but which prop you suggest for my set up ? thanks

[znus]

znus how are you, sorry to bother you again but which prop you suggest for my set up ? thanks

Hey alfredos. I've already answered you what I believe will be a good starting prop (post #5)

[alfredos]

hello znus , I will start with a 40mm like you suggested and work my way up . I will check the temps on the esc and motor and has the weather gets a little bit warmer I will start testing the princess in the water. any idea witch pitch to start with the prop? thanks so much znus for your time and your suggestions! thanks

[Boaterguy]

he said 40mm 1.4 pitch.
a k40 one OSE or an x440 would fall into those catergories.

[alfredos]

hello znus how are you? I want to thank you so much for your advice on the right prop for my princess boat, because I was able to go to the lake and test the boat with a 40mm graupner prop and my god the princess was flying ! I had no issues with anything getting hot at all. thanks again so much!

[znus]

hello znus how are you? I want to thank you so much for your advice on the right prop for my princess boat, because I was able to go to the lake and test the boat with a 40mm graupner prop and my god the princess was flying ! I had no issues with anything getting hot at all. thanks again so much!

Good to hear alfredos! If everything stayed cool you can try a 42 mm, make a few runs and check your temperatures.

http://www.offshoreelectrics.com/pro...od=grp-2317.42