head of the river cat hull thread

[crazzy maxx]

See the thread you started...

[G Doggett]

Counter rotating flex cables? Where do i buy them? I've never seen these - then again I've never looked for then before. Quote.


OSE have l/h and r/h wind flex cable.
Stevens got everything, you know that.!!!

Graham.

[Boatman]

There is nobody on this planet that knows more about cats than Fluid. You might be suprised if you saw one of his cats in action. You would do well to heed his advice.

As I have seen many times from a select few. Where the heck is the advise? All I ever see is criticism about what people say with their experience and people knocking each others builds but no advise is ever given. Some of us would like to know how to get a hull to handle at w.o.t at 60 mph. Again where the hell is the advise instead of the "I know how" and "If you know what your doing".

[785boats]

Ozzie Crawl is building up a twin drive version of these hulls & knowing his generous nature I'm sure he'll offer some pretty good advice once he sees your questions.
There's also a thread of a twin Maritimo hull being built by Bonewar which may have some useful info in it. Especialy the motor mounts & positions.

http://forums.offshoreelectrics.com/...ead.php?t=3090

You've got to remember Boatman, that there's probably not many people with first hand knowlege of twin drive cats on these boards so you'll have to be patient. The answers will come.
I myself have a single drive version of this cat with the SV27 package on 4s lipo spinning an X645 prop So I can't help much I'm afraid.
The only other thing I can say is that with the Ammo 2300 the X637 is a great prop. On 4s in a mono at least, if that's any help.
All the best.
Paul.

[ozzie-crawl]

thanks paul. this is my first twin cat so it is a new one for me as well. as far as mounting brackets goes it depends on were you will run your batteries
(ie in the sponsons or on the tunnel) if you run the batteries in the sponsons you will need to set them as far back as possible to get your center of gravity correct. i myself will not be running batts in sponsons so my brackets will be further foward as iam at this point not going to set it up for oval but just to see what speed i can achive
scott

[bonewar]

As I have seen many times from a select few. Where the heck is the advise? All I ever see is criticism about what people say with their experience and people knocking each others builds but no advise is ever given. Some of us would like to know how to get a hull to handle at w.o.t at 60 mph. Again where the hell is the advise instead of the "I know how" and "If you know what your doing".

Boatman your right on the money there mate. I would be only to happy to answer any question you have in regards to a twin drive cat. I have a build thread going on the twin drive maritimo which is about the same size as river cat hull . You might fine some interesting reading there. Showstoppercat mate in regards to the placement of your motor mounts. you really need to know where the c o g of the hull is first, then if you where to use wire drives , i would place the motor mounts towards the front of the boat to get a relaxed drive line, with the flex cable you can run a little more aggressive bend in the drive line, which allows you to move the motor mounts back, then just like Ozzie crawl said it depends on where you are going to run your batts, in the spoonson , on top of the tunnel. So my advise to you mate would be put everything in the hull and go from there , it will give you a better idea of where everything will fit around the center of gravity. hope this helps bonewar

[showstoppercat]

Yes batteries will be tied down in the tunnel - Was going to copy the the install positions like those lucky enough to have Jollycat - (ESC + Motor installed in Sponsons & Lipos in between) thanks boys !!

> Whats the BEST way to find COG??

> Which motor mounts will fit in sponsons - will any from OSE fit in there??

> As previously mentioned, I want/ will be using and running with .150 flex cables - will I be restricted to using the SV adjustable struts or can i use any with 3/16th prop shaft?? - Cause I really like the authentic looking drive shafts from MHZ like the Powertrimm VPX1 (twin pack) - If not can anyone suggest any others i SHOULD use consider?? - FOCUSED sent me a link of strut from (Head of The River ebay site) but they are not very flattering - Thanks anyway FOCUSED

[focused]

Yes batteries will be tied down in the tunnel - Was going to copy the the install positions like those lucky enough to have Jollycat - (ESC + Motor installed in Sponsons & Lipos in between) thanks boys !!

> Whats the BEST way to find COG??

> Which motor mounts will fit in sponsons - will any from OSE fit in there??

> As previously mentioned, I want/ will be using and running with .150 flex cables - will I be restricted to using the SV adjustable struts or can i use any with 3/16th prop shaft?? - Cause I really like the authentic looking drive shafts from MHZ like the Powertrimm VPX1 (twin pack) - If not can anyone suggest any others i SHOULD use consider?? - FOCUSED sent me a link of strut from (Head of The River ebay site) but they are not very flattering - Thanks anyway FOCUSED

You can use the MTC Powertrimm V long version with either 3,2 or 4,7mm flex cable
it will fit loooks nice and they are very strong but not cheap think 100 dollar each ex flexcable and tubing.

The MHZ vpx1 powertrimm is made by the same company MTC but MHZ is only selling them .

Link to MTC



Michiel.

[bonewar]

SHOWSTOPPERCAT The center of gravity should be around 28%-35% of the hulls length. this is measure from the back forward. and will give you a very good starting point, make sure you leave yourself a little room for the batts to be moved forward or backward, this will help later to fine tune the ride of the hull. Not to sure on the right size motor mounts need measurements. The powertrimm VPX1 are a very good choice , The stub shafts inner dia is 3/16 , so you can use your .150 flex as long as the end is 3/16 , ( i have done this on my sv27 all i did was cut the threaded part off the.150 flex cable then glued that into the stub shaft. I think if you are going to use the VPX1 you would be better off with 3/16 flex ( stronger/ no break problems). Run throw brass stuffing tube, no Teflon , lots of grease. bonewar

[Fluid]

CG should be 32-34% forward of the sponson transoms, not the back of the boat. The exact figure will depend on the speed and lifting characteristics of the hull, as well as the strut angle. Don't be afraid to add lead to the bow to get the CG where it needs to be, a few ounces of weight will improve performance rather than hurt it with this setup.


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[bonewar]

CG should be 32-34% forward of the sponson transoms, not the back of the boat. The exact figure will depend on the speed and lifting characteristics of the hull, as well as the strut angle. Don't be afraid to add lead to the bow to get the CG where it needs to be, a few ounces of weight will improve performance rather than hurt it with this setup.


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Sorry Showstoppercat i meant the the back of the transom spoonson forward. Once again the fluid response with criticism for those who try to help , Mate why don't you add you 2 cents worth when the question are asked , Do you like to wait on a response so that you can criticize it! dude all i here is fluid is the man when it comes to these cats, And all i see from you is smart ass replys to people that are trying to help other people! We are not all as good as you are ! legend

[showstoppercat]

thanks boys !!! for all the my questions so far - Will start with cog and making my own motor plates fixing them in - those MTC/ Mhz drives are cool (doesn't look like i can pay buy paypal - will need think about those......

[785boats]

Hey Showstoppercat.
Here's a bit more reading for you. Every little bit helps.
http://forums.offshoreelectrics.com/...ead.php?t=2400
Cheers.
Paul.

[Eodman]

Showstopper- I have a twin drive Jolly and I love it! I have only had it wet a few times but it runs real nice! It's powered with 8xl's & Hydra 240's(overkill but I had a little disposable income) Besides if I want to go faster I just have to get different motors!

I put the Esc's in the middle on the tunnel and the lipos in the sponson's! My thinking is with the lipo's in the sponson's it lowers the center of gravity! But I may be all wet!

[Fluid]

...i meant the the back of the transom spoonson forward...We are not all as good as you are !

Whatever. When I see misinformation posted that may confuse or cause a newer boater to screw up his build, I will correct that bad info even if it is my own. Newbies have enough problems without us giving them bum suggestions.

I am sorry that you feel so defiled because I pointed out your mistake. Tell you what - to avoid future spikes in your blood pressure - why not just put me on your IGNORE list? Hey, problem solved.



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