will this combo work out mathmaticaly

[Crash]

I got data recorder to work.
You have to run the program as Administrator and then it works .
I found a post here at OSE about it.

the data record says I am pulling 255 amps at 100% throttle
lipos are dropping down to 19.6 during 100% throttle
temps are 150f max
rpm is 30k+ at 100% throttle

it seems the amp draw is too high...what do you guys think

[TRUCKPULL]

I got data recorder to work.
You have to run the program as Administrator and then it works .
I found a post here at OSE about it.

the data record says I am pulling 255 amps at 100% throttle
lipos are dropping down to 19.6 during 100% throttle
temps are 150f max
rpm is 30k+ at 100% throttle

it seems the amp draw is too high...what do you guys think

A little smaller dia. prop, or less pitch. will lower your AMP draw.
It will also allow your voltage under load to be a bit higher.
a higher Voltage under load = higher RPM = Higher top speed.

Larry

[Crash]

Thank you for that truck pull the proper I'm running is the stock size for this boat I'm curious why with this new setup it's running slower on that prop and hotter only difference is a motor 1650 KV is what I had and now this one is a 1750 KV and a bigger esc

[CraigP]

I assume your running a 6s battery pack. So your trying to turn a big prop almost 39,000rpm. I shoot for 30-33krpm on all models. I have a hydro running 8s, 1250kv at 37Krpm. It’s a beast, and I must run a small prop. 1400kv is a good KV for 6s. I have much experience with T-180 and I find it very robust. Perhaps that 64% are running unbalanced systems. Also, I have found that TP motors use much more current than other motors. It is a very high performance motor and has low coil inductance. I have to increase the carrier frequency to 10Khz. It ran good there, but I didn’t like a low inductance at high voltage, so I changed it out to a Leopard motor.

But I think you’re turning too big a blade too fast, a recipe for electrical failure... Don’t let the smoke out!

[Crash]

thank you Craig, the prop is a 645 do you think its too much? I quit running the 652 it was a lot of fun but one pack got too hot for comfort

[CraigP]

I think that’s going to be your big prop. I would try a 643 too, and see which one gives you best temps and run times. Your are spinning very fast, so that pretty much boxes you out of bigger props. I’m at that point on my hydro. Like you, it’s hard not trying to run the bigger props I have. I got a 1050kv motor, but it’s a 4074, where the 1250kv is a 4082. Both run great, but the 4074 motor temps go up when running my ABC 1816-17-45 blade. I can’t find the exact KV/motor size I would like. That’s another frustration you’ll have to work the trade offs over. So I run the fast motor on days where the wind is down and the 4074 on windy days. Believe me, I feel exactly where you are. Try and follow the math to guide you.

[Crash]

I think that’s going to be your big prop. I would try a 643 too, and see which one gives you best temps and run times. Your are spinning very fast, so that pretty much boxes you out of bigger props. I’m at that point on my hydro. Like you, it’s hard not trying to run the bigger props I have. I got a 1050kv motor, but it’s a 4074, where the 1250kv is a 4082. Both run great, but the 4074 motor temps go up when running my ABC 1816-17-45 blade. I can’t find the exact KV/motor size I would like. That’s another frustration you’ll have to work the trade offs over. So I run the fast motor on days where the wind is down and the 4074 on windy days. Believe me, I feel exactly where you are. Try and follow the math to guide you.

Ugh.
I started at 52mph with stock set up.
Now with this setup same lipos, prop it is at 46 mph
I dont understand the Math.

[TRUCKPULL]

You say that you are running a ABC 1816-17-45
Then you say that you are running a 645 prop.
A Octura X or M 645 does not compare to the ABC props.

You keep mentioning the stock prop for the boat.
What prop is that and with what motor, size and KV.


What is exactly your setup right now.

HULL - type and length.
Motor - size. KV, Y or D wind?
ESC- type and size - is it programed to match the motor?
6S- 8S ??? - one or two p , make ,C rating , max C rating. mAP rating.

Prop - make, size, modifications,?????


Larry

[CraigP]

Yes, that info would be helpful.

Larry, I think the 1816 prop was in my post.

[CraigP]

I ran your numbers, 1750kv, 6s and 645 prop thru the calculator and it’s showing 70mph. A 643 is 66-67mph. So it’s in the ball park. But your speed goals leave no margin for error, so I’ll have to let you go for the gold ring without me. How a mono rides in the water will make a huge power difference. I hope you get there!

[Crash]

I ran your numbers, 1750kv, 6s and 645 prop thru the calculator and it’s showing 70mph. A 643 is 66-67mph. So it’s in the ball park. But your speed goals leave no margin for error, so I’ll have to let you go for the gold ring without me. How a mono rides in the water will make a huge power difference. I hope you get there!

why do you think my speed dropped with the new motor. this boat is a proboat RTR it came with a dynamite 1650kv I am guessing 3 hp the new motor I put in is as you know a TP power 8hp 1750kv
I would think using jthe same propeller the TP would be faster not slower... The data logger says the motor is spinning as fast as the old motor spun. the prop is spinning fast but boat is not moving fast...

[CraigP]

Take a video of it running is required. Also, take some pics of your esc/motor installation. You probably have combo problems. The stock wiring and connectors will drop more voltage with that TP motor in there. I also suspect something isn’t right in the ride characteristics. This is a Y motor? Are you running about 12-14 degrees of advance on the timing?

[Crash]

Ty.
I will get video and pics.
I am running the ESC on auto timing advance. It seems to run cooler .

[Crash]

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[Speed3]

That looks like the voracity, They is a wealth of info on the voracity turning thread about it. I would recommend going to the voracity turning thread in the rtr section on this forum.

I have learned that you need a good battery to get the tp to perform to its potential. Also the soldering has to be good at all points. Solder flowing through the wire like water before letting dry.

And if you are reving 30krpm plus and only doing 46mph I can tell the prop is not operating efficient enough to get the speed you want at 30krpm.