SMALL - espritmodel.com SMALL - Telemetry SMALL - Radio
Reply
Thread Tools
Old Aug 12, 2014, 02:28 AM
RELAX. You'll live longer
785boats's Avatar
Brisbane- Australia
Joined Jul 2007
3,275 Posts
Discussion
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.

http://www.gizmag.com/stiletto-exper...ts-60mph/5151/

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.
785boats is offline Find More Posts by 785boats
Reply With Quote
Sign up now
to remove ads between posts
Old Aug 12, 2014, 03:02 AM
Registered User
madracer's Avatar
Joined Aug 2012
129 Posts
Wow Paul.

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.
madracer is online now Find More Posts by madracer
Reply With Quote
Old Aug 12, 2014, 03:21 AM
RELAX. You'll live longer
785boats's Avatar
Brisbane- Australia
Joined Jul 2007
3,275 Posts
Mark.
I have every confidence that it will corner at full noise.
785boats is offline Find More Posts by 785boats
Reply With Quote
Old Aug 12, 2014, 03:28 AM
Registered User
Joined Oct 2007
71 Posts
hello,
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!
good built!
brushman is offline Find More Posts by brushman
Reply With Quote
Old Aug 12, 2014, 05:18 AM
Boaters are nice people.
Sneek, Netherlands.
Joined May 2004
5,091 Posts
Quote:
Originally Posted by brushman View Post
If you put them in the "sides", the 'inner' motor in turns will draw two much amps!
Not if you use a mixer setting that will reduce the rpm of the inner motor when turning.

Regards, Jan.
pompebled is offline Find More Posts by pompebled
Reply With Quote
Old Aug 12, 2014, 06:38 AM
Registered User
bostong's Avatar
Danmark, Sjælland, Sorø
Joined May 2011
436 Posts
Wow Paul, thats just really cool!!!
bostong is offline Find More Posts by bostong
Reply With Quote
Old Aug 12, 2014, 02:38 PM
RELAX. You'll live longer
785boats's Avatar
Brisbane- Australia
Joined Jul 2007
3,275 Posts
Quote:
Originally Posted by brushman View Post
hello,
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!
good built!

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.

Jan.
A guy at our club has been playing around with a mixer. Not sure how that's going at the moment.

Niklaus.
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.
785boats is offline Find More Posts by 785boats
Last edited by 785boats; Aug 14, 2014 at 12:45 PM.
Reply With Quote
Old Aug 13, 2014, 06:09 AM
Redneck Injuneer
bill34207's Avatar
Bradenton, Florida
Joined Aug 2007
6,453 Posts
That is one fat cat. Got to be a big improvement for cornering with a Genesis.
bill34207 is online now Find More Posts by bill34207
RCG Plus Member
Latest blog entry: 12 o'clock high 2014
Reply With Quote
Old Aug 13, 2014, 12:38 PM
Registered User
RayR's Avatar
United States, FL
Joined Aug 2006
219 Posts
Paul,

There is a small, but very dedicated group of Tri-Hull maniacs on International Waters. If memory serves correctly, they are all outboards.
RayR is offline Find More Posts by RayR
Last edited by RayR; Aug 13, 2014 at 01:03 PM.
Reply With Quote
Old Aug 13, 2014, 02:48 PM
RELAX. You'll live longer
785boats's Avatar
Brisbane- Australia
Joined Jul 2007
3,275 Posts
Quote:
Originally Posted by bill34207 View Post
That is one fat cat. Got to be a big improvement for cornering with a Genesis.
That's the main aim Bill. And of course that it's a bit different.

Ray.
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.

Cheers.
785boats is offline Find More Posts by 785boats
Reply With Quote
Old Aug 13, 2014, 05:47 PM
Registered User
madracer's Avatar
Joined Aug 2012
129 Posts
Quote:
Originally Posted by 785boats View Post
Mark.
I have every confidence that it will corner at full noise.
3 motors at full noise in a corner. Now That sounds awesome Paul.

Great work as always. TFL might even market it
madracer is online now Find More Posts by madracer
Reply With Quote
Old Aug 13, 2014, 06:30 PM
RELAX. You'll live longer
785boats's Avatar
Brisbane- Australia
Joined Jul 2007
3,275 Posts
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.
785boats is offline Find More Posts by 785boats
Reply With Quote
Old Aug 13, 2014, 07:30 PM
Registered User
RayR's Avatar
United States, FL
Joined Aug 2006
219 Posts
Paul,

Search for "Mod VP".
RayR is offline Find More Posts by RayR
Last edited by RayR; Aug 14, 2014 at 09:47 AM.
Reply With Quote
Old Aug 14, 2014, 12:41 PM
RELAX. You'll live longer
785boats's Avatar
Brisbane- Australia
Joined Jul 2007
3,275 Posts
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.
785boats is offline Find More Posts by 785boats
Reply With Quote
Old Aug 14, 2014, 01:12 PM
RELAX. You'll live longer
785boats's Avatar
Brisbane- Australia
Joined Jul 2007
3,275 Posts
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.
785boats is offline Find More Posts by 785boats
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Discussion New genesis with hull issue? Take a look on the pics Maxxdriver Racing Boats - Electric 16 Jun 28, 2014 12:06 PM
For Sale Genesis Twin - Hull and Hardware only RayR Boats (FS/W) 4 Oct 26, 2013 02:20 PM
For Sale *Cracked* Genesis Hull w/ rudder & Servo QYKSLVR Boats (FS/W) 2 Oct 13, 2013 02:45 PM
Yippee! Carbon Fiber Genesis Hulls!! FighterCat57 Racing Boats - Electric 7 Dec 03, 2010 02:34 PM
Discussion bought the "Genesis Offshore Twin Hull",need opinions! ginnz Racing Boats - Electric 77 Oct 20, 2010 05:52 PM