head of the river cat hull thread

[Tony]

I cut a piece of ply and epoxied it in the strut holder. Before it hardened too much I drilled and used blind nuts...I had to use hemostats to hold the nuts to get them started...a real pain but worked and they are not moving. Now I can remove the bolts and nuts stay there.

Just need to finish the cooling in mine and it is ready. 8XL, 4S and Etti 150. Probably start with m440 and end up with a 640. I am going to push one of my 62 wires in it for now but was built for 078 wire.

Jeff, Are you using Etti 150 with BEC? Mine is 9xl, 4S, Etti 125, and 642 prop. Wonder why no one is running with x445 prop...

[785boats]

Tony.
When I had the SV27 package in mine I tried a 445 & a 645. Seemed to have a lot of prop walk & was very unstable in the corners.
With the 8XL motor in it now the biggest I run is a 642. The 640 is the one I run most of the time though. Good speed, good handling & good temps.
Never tried a 445 on the 8XL. I'll have to replace the bearings first though, they're sounding a bit rough.
Surely someone else has tried a 445 or 645 in this boat.
Cheers.
Paul.

[Tony]

Tony.
When I had the SV27 package in mine I tried a 445 & a 645. Seemed to have a lot of prop walk & was very unstable in the corners.
With the 8XL motor in it now the biggest I run is a 642. The 640 is the one I run most of the time though. Good speed, good handling & good temps.
Never tried a 445 on the 8XL. I'll have to replace the bearings first though, they're sounding a bit rough.
Surely someone else has tried a 445 or 645 in this boat.
Cheers.
Paul.

Paul,
Which ESC are you running with the 8XL?

[Jeff Wohlt]

Actually my etti is only 125 amps but is good with BEC...special made unit.

a 445 might be perfect...not sure yet but I will play with all of them.

I usually am just looking a 4-5 minute play run...not racing...lots of speed in the straights is what I like.

Because of that hull I feel staying a bit smaller on the 8Xl is going to be key to maintain good cornering without torque problems or chine walking.

We will see. I just need to finish it up. Certainly a great looking cat but I would consider filling the nose with some foam...I hear they crack open when doing an end - to - end dive. I plan to just do some spray in foam a little at a time until I feel it is enough with expansion. It also sticks the top and bottom together where chunk foam does not.

[ozzie-crawl]

7xl with a 440/3 runs real nice, 55mph and no real prop walk

[pbleckert972]

anybody know how fast the rtr is stock on 4s?

[Tony]

anybody know how fast the rtr is stock on 4s?

stock rtr The motor is not strong enough to push that hull.

[BIGDG357]

Finally , I can get a little progress on this thing. I got my hardware from OSE today I will have to shim it off of the transom to give the steering arms a little extra room. Thats a piece of carbon fiber in there now but that one is going to be moved into the inside of the transom for support and i'll cut a new one a little nicer for the shim. I see i'm not the only one having trouble due to the quality of this hull the steering rams will have to be angled and scribed on the mounting side to sit flat and not bind up becaus of the transom not having a flat mounting surface but I love the look of them so whatever it takes they are going on there. Here is a few pics with every thing sized up and taped on for measuring

[bonewar]

!!!!!SWEET!!!!!

[BIGDG357]

!!!!!SWEET!!!!!

thanks man those are the MHZ rams you told me about .THANKS

[BIGDG357]

OH' but I did have to modify them to fit, I had to cut the bottom mounting tab off and drill a new hole the transom is very thin on this hull

[ksm2001]

7xl with a 440/3 runs real nice, 55mph and no real prop walk

Sweet
BTW Scott nice carbon fiber job , what did you use for finishing resin with the carbon fiber?

Ken

[ozzie-crawl]

being no expert with resins i just use a laminating epoxy (i think) thats used if your doing multiple layer, its a little sticky for awhile after it dries but after i finish doing motor/servo mounts i use some carnauba wax,gets rid of the sticky

[Brushless55]

7xl with a 440/3 runs real nice, 55mph and no real prop walk

Wow! 55mph with a 7XL, I wonder if I could use that motor in my MM and get the same speeds?

[pbleckert972]

anyone seen this?

http://cgi.ebay.com/New-RC-2CH-Electric-Brushless-RTR-Race-Boat-Hydroplane_W0QQitemZ290339827022QQcmdZViewItemQQptZAU_Toys_Hobbies_Radio_Controlled_Vehicles?hash=item43999a2d4e&_trksid=p3286.c0.m14