Exceed Racing Flowmaster Catamaran 650mm build help.

[studioRS]

Added a separate water pickup for either the motor or ESC. Curved at the bottom and flush. Used CA glue to fix position, then epoxy with ply reinforcements.









Didn't like the Z bend on the rudder connection, so soldered a tight clip—no play now! Graupner/SJ 658 BB MG servo.

[studioRS]

Added flotation


Turned out I didn't even need to add an aluminum plate on the backside of the new ply transom. The epoxy / chopped glass filled the void and I even added a second layer of ply before to the transom just in case. I used the stock length bolts and just tapped the epoxy / chopped glass. No need for nuts!

Installing a water cooling tube on the transom water inlet proved to be a little challenging, no room for fingers. This was also tapped into the epoxy, so to be a water tight fit. Idea! I used a slightly larger brass tube over the silicone tubing and pushed it on.


Specs
- Turnigy 2860 2700kv motor with 28x58mm water cooling jacket from OSE.
- Turnigy Marine 120A ESC, Graupner 658 BB MG digital servo, Airtronics / Sanwa MX-V 3-channel radio.
- Battery: Zippy 3S1P, 4000mAh, 20C with 4mm connectors.

[studioRS]

More...

[studioRS]

And finally a video of the maiden.

In the video, I used the stock 432/3 carbon prop, stock 4mm flex cable and shaft.

I have a 436 CNC and 436/3 TFL (needs balancing). Might try these both.

[studioRS]

Swapped to a CNC Aluminum 436 prop.

[Brushless55]

Was this on 3s ?
looks good man !

[studioRS]

Thanks! Just need to pull out all the blue flotation foam and add CF/Kevlar epoxy to the sponson tips and front area. Don't want to have this happen if I catch a tip WFO…

http://www.rcgroups.com/forums/showpost.php?p=32506512&postcount=720

[Davey80]

Thoroughly enjoyed the read-up on this build. So much great info and excellent pics! I just recently picked up this boat and am going to apply what I learned here to take a shot at doing a CF inlay.

Bit of an older thread now, but would love to hear an after-action on how you liked the boat and its performance, given all the work you put into it.

Mark

[studioRS]

@Davey80 - Thanks! There was only one item that I neglected to fully address, getting enough epoxy down into the sponson tips, before adding the flotation foam. I did add some epoxy, but could have added a little more. You don't want to add too much weight though. The CF reinforcement definitely helps, just keep the epoxy application light.

It's a fun little scale hull and certainly fast. I was about at the limit with power and battery, as you can see in the video, the torque roll was significant on full throttle. I've since sold this on, so can't really help out with further performance tuning.

[studioRS]

Was this on 3s ?
looks good man !

Yes, 3S, 4000mAh 20C.