|Aug 12, 2014, 02:28 AM|
Genesis 'M' hull
Since everybody complains that the Genesis cat is too narrow for oval racing. I contacted Monica from TFL. And with the blessing of the owner Mr Ke she shipped me a couple of factory seconds for a little experiment. They arrived this afternoon.
Straight down to the Wet Track Racing boat shed they went. One hour later & they looked like this.
I've always wanted to build an M hull ever since I saw this a few years ago.
I haven't decided on whether to give it two or three motors yet.
But I can easily fit three 4092 size motors in there.
This is just a fun experiment. But it might be able to run in out EC 12s Off Shore Cat class if it is even modestly successful.
|Aug 12, 2014, 03:02 AM|
You have been talking about this for a while. You didn't stuff around hey. Yep it's different and so should be the drive line with 3 screws all the way but not sure how it will corner??
Can't wait to see it running.
|Aug 12, 2014, 03:28 AM|
Joined Oct 2007
this is fun! you should put 2 motors like two genesis single drive.
If you put them in the "sides", the 'inner' motor in turns will draw two much amps!
Running a twin on oval is a bad idea, or the motors axis should be near the center
two 3674, and 2 x 6s 5000 45c will push enough!
|Aug 12, 2014, 05:18 AM|
Joined May 2004
|Aug 12, 2014, 02:38 PM|
I'm afraid I can't agree with all of that pal.
I run a twin cat in oval racing & it's leading the points score in the championship at the moment. I know that technically the inner motor should draw more amps in the corner. And other guys in the club bear that out with their twins. On average it's about 10-12 percent difference.
But mine doesn't. In fact it's the outside motor on mine that draws a bit more. About 5%.
Why? I hear you ask. I'll let you in on a little secret. I took about three quarters of a millimeter off the tip of each blade on the inside prop. A fraction too much it appears. Half a millimeter would probably be about right.
This unloads it a bit in the corners, but doesn't affect the straight line drive. The motor might be revving fractionally higher but the thrust is the same because the rudder is dead centre.
A guy at our club has been playing around with a mixer. Not sure how that's going at the moment.
As long as it stays cool on the water. If you get my drift.
But I've had all night to think about it & just for the novelty factor she's getting a Triple set up. Just because we can.
At this stage I'm thinking 3 x TFL SSS 4074 2300kv on 4s 6000mah 55C packs. each.
That makes the max 12 cells allowable in the EC class.
|Aug 13, 2014, 12:38 PM|
There is a small, but very dedicated group of Tri-Hull maniacs on International Waters. If memory serves correctly, they are all outboards.
|Aug 13, 2014, 02:48 PM|
I'll have to check that out.
I've googled around for tri hull offshore cats but can't find any. Models or full size.
If anyone can find some images or info, I'd love to see it.
Well last night I epoxied in a couple of pieces of 1/8" aluminium for the rudders to bolt to, & then ran some glass cloth around the external seams of the two halves for extra strength.
I should get the halves joined & some glass cloth along the join line today some time.
|Aug 13, 2014, 05:47 PM|
|Aug 13, 2014, 06:30 PM|
That would be good Mark. But let's not get ahead of ourselves just yet. It might be a resounding flop.
But it's all about the fun factor with these sorts of things.
|Aug 14, 2014, 12:41 PM|
Thanks for that Ray.
Some great info & images there. I really like this one.
Looks like a flat centre sponson is the way to go. But I think I'll leave the inverted V for the initial trials just for the hell of it. It will either create more drag than a flat one or it will help lift the hull. The gut feeling tells me I'll end up putting a flat pad on it.
|Aug 14, 2014, 01:12 PM|
Well I got the two hulls joined.
Some 50mm wide glass tape around the inside with an extra piece along the bottom join.
Then I decided to run a strip of lightweight cloth on the deck joins. I'll fair that in with a bit of auto blade putty later. Tonight I'll run another piece of tape on the outside of the bottom join.
I cut & fitted some pieces of 1/8" aluminium plate for the stingers to bolt to as well.
Now I can make three motor mounts & fit them along with the stuffing tubes.
I'll have to pull a 4074 motor out of another boat to use as a test fitting rig.
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