whats a good hull for fast straight line speed?

[kfxguy]

First off I don't want this to become a debate.

I want to build a 80 plus mph boat. In the 30 something inch or under range. Is this possible? What's a good hull to use? I'll be running in smooth water. Whatever help you guys can give me will be appreciated.

[Darin Jordan]

First off I don't want this to become a debate.

I want to build a 80 plus mph boat. In the 30 something inch or under range. Is this possible? What's a good hull to use? I'll be running in smooth water. Whatever help you guys can give me will be appreciated.

I would think that would call for a nice P-sized Hydro.

If you don't want to pop the $$ to have Brian Buaas build you a Raptor (which would be my first choice), you could likely build yourself a JAE, then fab some custom SAW style sponsons.

OR, there are lots of CAT options out there.

80mph in anything isn't "easy", but the power is easily available.

[Darin Jordan]

You might want to pop over and pick this up as a starting point. Built correctly, this hull could certainly do the trick:

http://forums.offshoreelectrics.com/...idon-Rigger-FS

[kfxguy]

Would I have to run a rigger? I'd kinda rather a cat.....what cat could I use?

[Rocstar]

I would suggest a larger hull. A cat of that size would be difficult to keep on the water at 80+mph (not impossible). My 41'' Fantasm runs in the 90s and a blow over can happen at any moment. And like Darin said, 80 is no joke...Things will break at those speeds. It's a rush to run that fast, as long as understand the risk and the high potential for loss.

[Darin Jordan]

To do that with a 30" Cat would be a challenge..... It can be done, but you're going to break a lot of stuff getting there. The mass and such of a boat that size hitting the water in a flip at 70+ just breaks things.

With a Hydro, you have a lot easier time keeping it on the water...

But, if you insist on a Cat, then you'll have to do some research. You'll want something that is SOLID. Your typical glass layup will get destroyed at some point. Hardware needs to be solid as well. Bending rudders is going to be common unless you use stainless steel knife blades.

[nata2run]

With no budget in mind, you could go something like MHZ Mystic C5000 - 840mm - 33,07" you can get that in carbon/kevlar to be on that safer side. Setting up as twin should get you around 80mph with a few different motor choices also. but as many has said, small cheap glass hulls are more likely to break.

[Fluid]

I was able to push my little "RiverCat" (actually a Skunkworks splash) deep into the 80s and set two SAW records with relatively inexpensive parts. A $120 Castle 1515/1Y on 6S1P and a Prather 235. Unless you run a cat over 36" you will need pretty flat water to run those speeds but it is certainly possible with some work.

I'm not the only one to do it either. Riggers do have a higher speed potential but they can be more difficult to set up. If the OP wants a cat he can go 80 without breaking the bank. As with any fast boat the build and setup are critical. I'll be glad to help.

BTW I crashed my glass cat at over 80 mph many times without damage. I did build it to crash though.....



.

[RaceMechaniX]

You can buy Darin's 25" Radatek Cat after he sets a SAW record of 80+ with it.........

[kfxguy]

I was able to push my little "RiverCat" (actually a Skunkworks splash) deep into the 80s and set two SAW records with relatively inexpensive parts. A $120 Castle 1515/1Y on 6S1P and a Prather 235. Unless you run a cat over 36" you will need pretty flat water to run those speeds but it is certainly possible with some work.

I'm not the only one to do it either. Riggers do have a higher speed potential but they can be more difficult to set up. If the OP wants a cat he can go 80 without breaking the bank. As with any fast boat the build and setup are critical. I'll be glad to help.

BTW I crashed my glass cat at over 80 mph many times without damage. I did build it to crash though.....



.

This. This is what I wanted to hear. I have that motor already. I have an ESC for it and i was about to buy a cf river cat hull. You just made my decision easier. I'm gonna pm you for further info

[properchopper]

Boyd has the P Cat NAMBA SAW record with the 32" FCR rivercat at 102.881mph at 2.187 seconds between the lights (330 feet apart). Wasn't easy

[kfxguy]

I ended up buying a brand new carbon fiber river cat today. I'm in the middle of a carbon fiber daytona build right now too. I've got pretty much everything to build the rivercat too. Well the most expensive stuff. Think I'm going to run a 1515 castle with a fightercat 240a ESC on 6s.

[Darin Jordan]

You can buy Darin's 25" Radatek Cat after he sets a SAW record of 80+ with it.........

Tyler. ... not so fast.... I may want to keep it if I can make that happen. ;^)

[gsbuickman]

[QUOTE=Darin Jordan;553164]To do that with a 30" Cat would be a challenge..... It can be done, but you're going to break a lot of stuff getting there. The mass and such of a boat that size hitting the water in a flip at 70+ just breaks things.

Hi Darin'

I agree with you on the hydro. The best bang for the buck outta the box is the UL-1 with its 60-65 mph. With a Lil' tweaking 80mph is achievable. A rigger would be my second choice. Since we're talking about cat's, look what people are achieving with a Mean Machine & dual UL-1 setups on 10s (5s x 2)

[Darin Jordan]

Boyd has the P Cat NAMBA SAW record with the 32" FCR rivercat at 102.881mph at 2.187 seconds between the lights (330 feet apart). Wasn't easy

It should be noted that this was achieved using twin power systems... which is legal in NAMBA for P (4-cells) and up. Each power system can only be powered by 4S1P. LOTS of power there! VERY "fun" to get tuned, especially with twin, counter-rotating props... Boyd has been doing a GREAT JOB!!