Catamaran Tunning

[Norman2]

Hi, I am building a 32"Catamaran and need some help. Do you use trun fins and
trim tabs as you use in monos. Thanks

[Ocean Racer]

it depends on your setup you can use turn fins but trim tabs are not realy used. If you run a single drive you can do turn fins. By the way what type a of cat are you building?

[Norman2]

Building 32" Catamaran

I bought the Catamaran from Head of the River R/C Specialist on E-Bay Stores.
I rum my Titan 29 in P Spec Offshore and hope to run the Cat with a Brushless
Motor and 12 NIMH Cells ( Don't like Lipos) Planning on Feigao 9 or 10 XL with
Castle Creations ESC and an Octura X447 Prop. Have no experience with BL and
will be asking for some advice. Hope I do not have too many problems and If I do
I will go with a brushed 700 OSE SC motor which seems to owrk fine with my Titan 29. Thanks for your help.
Norman2

[Norman2]

Photos of 32" Catamaran

Here are some photos
Norman2

[focused]

They are nice boats but nead a layer of carbon just incase because its fiberglass with polyester and not epoxy laminate .

I bought 3 from head of the river and have 1 finished with 1 feigao 540xl9 and 6s lipo Zippy H with a ETTI 125Amp esc (they are very good) speed up to 60mph .
The cat does not need any turnfins or trimm flaps its very stable at high speeds unless your CG is bad then it can flip easily backwards.

[kwiktsi]

What is the reason for using the carbon just because it is poly and not epoxy? Also, since it is poly, I'm assuming you laid the carbon using poly as well, right? Also, what prop are you running on that 9XL with 6S? Thanks.
Joe

[focused]

What is the reason for using the carbon just because it is poly and not epoxy? Also, since it is poly, I'm assuming you laid the carbon using poly as well, right? Also, what prop are you running on that 9XL with 6S? Thanks.
Joe

I used carbon because a fiberglass hull with polyester laminate is harder but brakes easier , if the hull were fiberglass with epoxy laminate then the hull was flexibler and would not brake that fast . And no i used epoxy but if you sand it well it will stick very good to poly.

I already broke the hatch when i was sanding it to get rid of the windows but fixed with a layer of carbon.

I have used a grimmracer prop 40x52/3 but that whas not good for speed but corners perfect now i`m using a 42x55 grimracer and testing en 45K prop also.

Michiel.

[kwiktsi]

I used carbon because a fiberglass hull with polyester laminate is harder but brakes easier , if the hull were fiberglass with epoxy laminate then the hull was flexibler and would not brake that fast . And no i used epoxy but if you sand it well it will stick very good to poly.

I already broke the hatch when i was sanding it to get rid of the windows but fixed with a layer of carbon.

I have used a grimmracer prop 40x52/3 but that whas not good for speed but corners perfect now i`m using a 42x55 grimracer and testing en 45K prop also.

Michiel.

Thanks for the reply. I did not know that about the poly being a bit more brittle. I am still trying to learn how to tell the difference between poly and epoxy, I was told the only way to tell is to sand it and smell it. Is there any other way to know?

Now you are making me want to change the setup in my 26" cat as I am only running 4S on an 8xl/x440 setup :). I am going to try it on 5S and see what happens, hopefully that will get me a noticeable increase. If not, I will go 6 and hope for no . I'm thinking if a 9XL can handle a 42mm prop and 6s in a bigger 32" hull, my 8xl should be able to in a 26", we'll see what happens :).

Also, glad to hear some info on these hulls, I have been eying them myself but wasn't sure of the quality. I have his 32" mono and that seems to be a good boat, so the cat was next on my list to look at. I noticed the dimples above the sponsons on the transom (if you flip it over)- is that so you can fit stingers in there? If so, I'm thinking that would be a neat boat to run dual 8xl on 5S each in using his stingers!

[00garyc]

cat

I built one of those for a friend used a 8xl and 120 hydra no fins or tabs running a x440-3 blade the boat is a rocket on 2s lipos mount your motor way forward the boat has a tendcy to want to fly and yes definately streighten the bottom use carbon fiber or even a thin hobby wood like birch and waterproof it.

[kevinlew211]

They are nice boats but nead a layer of carbon just incase because its fiberglass with polyester and not epoxy laminate .

I bought 3 from head of the river and have 1 finished with 1 feigao 540xl9 and 6s lipo Zippy H with a ETTI 125Amp esc (they are very good) speed up to 60mph .
The cat does not need any turnfins or trimm flaps its very stable at high speeds unless your CG is bad then it can flip easily backwards.

Hi,
how that hull turning? im sorry to jack the threat a lil bit, but i guess everyone also want to know too, its a good looking hull.

[focused]

The hull turns very well, its the same hull (same underwatership only the deck is different) as the drifter MKII from Hydro&marine and those are the best in that size. The chinese cat is a copy from the Hydro&marine Agitator.

So do not fit any turnfins or trimmflaps it does not need any .

[andym]

Not being a cat owner I must ask what is a better hull, a mean machine or these 32" chinese hulls? Looking at a cat and would like some input.
Cheers

[Eodman]

Andy - I don't have a chinese hull but I do have A Mean Machine hull and I have to tell you ... this MM hull is strong! It is orginally used for gas/nitro use so its strong! A little heavy but check out the other MM build threads .... right out of the box you can make this Kitty get up & go!

[andym]

Thanks for the info, sorry to hijack the thread.