80 mph on 3s with the Zippkits R4

[LibertyFrancis]

I picked up this used R4 rigger from Oscar Love in north Texas.
It was a bare hull and had been crashed/repaired. With a little love it made it back into the water this week.

I am really happy with the results of this setup.
TP3630
Hydra X ESC
Onyx 6600 3s pack
3/16 flex setup
42 mm china aluminum CNC prop (unknown pitch) specs only say "high rake"

The clean run starts around 1:50

 

[Oscar Love]

NICE!! Glad you're getting some speed out of it!

 

[LibertyFrancis]

NICE!! Glad you're getting some speed out of it!

Thanks man! She runs very good. Better than my FE33.
No regrets on the purchase. I wish this hull could fit the XLX2 and it would really be cooking!

 

[Dave Gilles]

dang that has to be over 450 amps!

 

[LibertyFrancis]

dang that has to be over 450 amps!

I wish I knew. The Hydra x logging stops at 353.9 amps

I originally tried to setup this boat to run on a CNHL 2,200 mAh 70c lipo to keep it very light weight. That LiPo ran the boat for 10 seconds. It got pulled down to 4.8v overheated and puffed like crazy. I am lucky it didn't burst into flames....

 

[LibertyFrancis]

I changed to a lower KV TP3640 motor and ran this boat on 4s at 94 mph.
The castle data logs show it has a little more in the setup. I hope to break 100 mph next time out.

 

[IntlAdmin]

Wow, it really moves. And great to see that you retrieved it without sliding in that mud.

 

[LibertyFrancis]

Wow, it really moves. And great to see that you retrieved it without sliding in that mud.

Thanks!
Yes that was some slippery stuff!!! My son ended up sliding into the water luckily still standing up...

 

[Jeffrey Hammond]

I just purchased an R4. Any advice on the build?

 

[LibertyFrancis]

I just purchased an R4. Any advice on the build?

I had bought this one from Oscar already built... so I don't know much about the build related to the wood assembly. They are well designed as is. I don't see any reason to deviate from the instructions.

The one thing I do for all my riggers is swap to a speed master Mono strut because I don't like the Z strut they have with these kits, they always come loose. https://www.offshoreelectrics.com/proddetail.php?prod=ros-spdss-002

I am starting a new 33 FE build tonight

 

[Jeffrey Hammond]

Thank you for the heads up on the strut. Will go with your recommendation for the strut.

 

[Jeffrey Hammond]

Hey Liberty
I just finished building my R4 rigger. I plan to run it on 4s batteries. Is a 4s 5000 mah battery a good size? By the way, I set it up with the strut you suggested.

 

[LibertyFrancis]

Hey Liberty
I just finished building my R4 rigger. I plan to run it on 4s batteries. Is a 4s 5000 mah battery a good size? By the way, I set it up with the strut you suggested.

Yes I had a SMC 5100 mAh soft pack lipo in my 4s video above. It just barely fit so double check the dimensions.
I highly recommend SMC for batteries.

 

[Jeffrey Hammond]

Do you think the SMC batteries are better than Pulse or Gens Ace?

 

[LibertyFrancis]

Do you think the SMC batteries are better than Pulse or Gens Ace?

100% yes
Best thing is to review the data.
Check out the list for 700-800g

https://www.rcgroups.com/forums/showthread.php?1767093-Battery-Load-Test-Comparisons

 

[Jeffrey Hammond]

Ok, putting in an order for 4s 5000 SMC batteries tomorrow. Just need to adjust length of prop shaft and put decals on the cowl and I’m done with the build. Need to also check battery sizing to make sure they will fit.

 

[LohringMiller]

Be sure you get the SRD-V3 Speedrun packs. I and others find that their internal resistance is the lowest of any other batteries I've tested.

Lohring Miller

 

[Jeffrey Hammond]

Too late! Already ordered the hpl- hc. Ordered 4 of them so I could use them in my Xmax truck also. Plus the SRD-V3 packs are out of stock. So the HPL will get me going.
BTW, my boat is my first electric rigger and is bone stock. Is the stock propellor the best one to run?

 

[LibertyFrancis]

Too late! Already ordered the hpl- hc. Ordered 4 of them so I could use them in my Xmax truck also. Plus the SRD-V3 packs are out of stock. So the HPL will get me going.
BTW, my boat is my first electric rigger and is bone stock. Is the stock propellor the best one to run?

That should be fine.
The SRD is more helpful if you are going for really high speeds.

The original prop should be good to get you going. Then you could look into different props to tune its behavior.
First runs should be short and check the motor, ESC, and connector temps with an IR temp gun (amazon)