cat hulls

[rcboatfan]

whats the point of the steps on a cat hull?? do they need to be there?? what do they do?? thanks

[sailr]

They allow the water to vent to the side, reducing the "suction" of the flat hull bottom surface to the surface of the water.

[rcboatfan]

i wwant to draw my own plans for a cat so should i put them on?

[domwilson]

Here's a good explanation. http://www.rcboataholic.com/hulls/hullsintro.htm

[Jesse J]

Yes you should. They look really cool, they can't hurt (unless you do em wrong) and did I mention they look cool? Also, real boats have em so therefore, you should have em on your boat. I put them on all mine (over 22") and I will be disappointed if you don't. (besides they look cool). You might get some better speeds also, especially on flat water.

So are you debating lift strakes too? or want just a flat ride pad? I bet Simon will chime in soon, I'll be curious to hear his take.

[rcboatfan]

ok ill put them on jesse j haha

[Simon.O.]

I bet Simon will chime in soon, I'll be curious to hear his take.

Thanks for the intro Jesse.

I am no expert at all, just a serious question asker. Here is one of the threads that may help.
http://forums.offshoreelectrics.com/...ead.php?t=6576

Steps do look cool !

[Flying Scotsman]

A serious question asker after the All Blacks lost to the Springbok
This gents is the sport of real animals not like some other lame animals

Douggie

[egneg]

I am not sure if this is a good example but it is an old Kyosho Hurricane. It came with brushed motors and a 2:1 gearbox and ran on 2 six cell packs in parallel - I put in a direct drive KB45 on 2 x 2S lipo's in series. It went from 12 mph to 35 mph.

[Jesse J]

Good link Simon. So I will ask here since you are thinking of drawing up your own.

Missing topic from Simons thread: all steps parallel? or back one up some? (i.e. sitting on a table, the transom is up about 5mm - I will measure and give angles and pictures soon.)

My plans from Shockerman are flat on the bottom as seen in profile from the side. Whereas my Intruder has a slight rise in the last step aftward. This FORCES the bow up unless you have serious down pitch in your struts. I have still to try the full down but am not really understanding this design element.

[Jesse J]

I am not sure if this is a good example but it is an old Kyosho Hurricane. It came with brushed motors and a 2:1 gearbox and ran on 2 six cell packs in parallel - I put in a direct drive KB45 on 2 x 2S lipo's in series. It went from 12 mph to 35 mph.

How about a pic of the bottom, Egneg Rm?

[egneg]

How about a pic of the bottom, Egneg Rm?

Here you go - best I could do with my cell phone.

[Jesse J]

looks like long steps and ... are those turn fins??

[egneg]

looks like long steps and ... are those turn fins??

Yes they are. I had to put them on as I am still using the original steerable drive and it tended to spin out.

[rcboatfan]

what speeds would i get with a 36inch cat with twin 7xls and 4s LiFe on each motor??