Thundercat 31 conversion build

[lomdel]

Very good Lomdel, don't worry about the GPS as soon as you are happy. Or use it only for information and nothing more. May I ask about the ESC is it the 3-7s or 4-8s version, and if it is the latter one did use its BEC or not. I would suggest not using its BEC but an external UBEC or AA batts. Finally what did you use to waterproof it? Thanks

It was the 3-7S one ( http://www.himodel.com/electric/HiMo...200A-OPTO.html ). I did not use the BEC and connected a 5-cell Rx pack to the set-up. Waterproofing was done with a few coats of CorrosionX sprayed liberally over the entire ESC and left to dry(ish) between coats. You can see from my posts how it was watercooled AND fan-cooled.

[Brod]

Hi,good build thread,nice reading

Is the esc. still working fine?

Just for a weight comparison,i'm putting together a 29" cat with a 400g.motor and a 6000mah 5S pack using a 170g.esc.total weight will be similar about 2600g.
Cat hulls tend to be heavy with the glass work compared to a mono,for example,same setup as my 29"cat in a 33" Delta(copy) is only 2300g.

If you decide to keep it,i would strip out all the wood stringers etc,you would save a good 300g.
weight in a FE makes a big differance in performance/speed.
Brod..

[lomdel]

Had it on the water yesterday again after a loooong rest. Ran only 38mph with a P215 prop, 13XL motor, 4000mah 25C 6S1P Lipo's, Himodel 200A ESC and temps were 110F on the endbell after 4min run.

[lomdel]

Took her out yesterday and today for a couple of runs. No GPS, no temps, just a lot of fun! Still with the 215 prop, 13XL motor, 4000mah 25C 6S1P lipo's and Himodel 200A 4-8S ESC. Ran her until the ESC's LVC kicked in and had to swim for her... Great fun nonetheless.! Here are a few pics of her as she looks nowadays (new canopy).

[lrm50]

I know what you'er going thru. I recently finished a 33 delta force with a 14xl, hydra 240 low voltage esc and a x645 prop 2 3s5000. I was dissapointed looked like an sv on steroids. Had a 13l nemisis laying around popped it in and 2 2s 4500 boat is like a rocket very pleased with no over heating issues. I say try the 10xl and you might be suprised. I also a tc31 hull that I want to set up with twin motors in the future. lots of luck

[Steven Vaccaro]

I know what you'er going thru. I recently finished a 33 delta force with a 14xl, hydra 240 low voltage esc and a x645 prop 2 3s5000. I was dissapointed looked like an sv on steroids. Had a 13l nemisis laying around popped it in and 2 2s 4500 boat is like a rocket very pleased with no over heating issues. I say try the 10xl and you might be suprised. I also a tc31 hull that I want to set up with twin motors in the future. lots of luck

Did you run the 14xl on (2) 3s packs in series for 6s? If so it should have run well into the 40mph range. I have many, many customers running that same setup with great success.

Both setups you mentioned are about the same final rpm. The 13L is a bit more rpm, but not much.

[lrm50]

yes I ran the 14xl on 6s 2 3s in series but can you explain why boat is faster with 13l? its a big differnce the way boat runs

[Steven Vaccaro]

yes I ran the 14xl on 6s 2 3s in series but can you explain why boat is faster with 13l? its a big differnce the way boat runs

Could have needed a different prop. What was the average amp draw with the x645? How hot was the motor after the run.

[lrm50]

I tried a smaller prop x442 w/ 14xl little differerence was'nt happy with it I bought the 13l for 40$ from fine design (my local hobby shop) for my rc truck and then decided to try it in the boat was told it was equivelent to the 8xl maybe its not a 13l

[m4a1usr]

Get a Neu motor dont settle for less. I have been running a TC31 FE conversion for a couple years and running the right motor makes all the difference. I settled on a 1521 1.5Y and its got all the power you can need for sport running. A prather 225 and you will be well over 50mph. With temps barely warm on all the important parts.

John

[calcagno45]

The 1515/1.5Y on 5s is a really nice choice. I ran a M545 with this combo for 50mph runs and very cool temps!!

[lomdel]

Get a Neu motor dont settle for less. I have been running a TC31 FE conversion for a couple years and running the right motor makes all the difference. I settled on a 1521 1.5Y and its got all the power you can need for sport running. A prather 225 and you will be well over 50mph. With temps barely warm on all the important parts.

John

Was that on 6S John?

[m4a1usr]

Was that on 6S John?

Yep. I run it on 6S2P just for endurance. A mild setup yet you can hand the boat to a beginner and it drives sweet even to a newb. Stable in wind and chop. There arent too many 50+ mph boats that can boast that unless their monsters. Not bad for a hull under 1 meter.

John

[lomdel]

John, isn't the 1050kv of the 1521 1,5Y a bit low on 6S? You sure you get 50+ mph with this motor on 6S in a TC31 hull with a 225 prop?

[lomdel]

I crashed/wrecked my boat two days ago at full speed head-on into the canal wall where I ran it due to stripped steering servo gears...!!! I will post pics and details later, have to mourn first...