Pursuit 32 Mono with Data

[Diesel6401]

Well ran the Pursuit today got GPS & Eagltree data. Kinda disappointed with the speed 44.7mph, but after reviewing the eagletree data I think I found my problem. I don't think the esc is throttle calibrated correctly. My loaded RPM's where approx 7k rpm below what the calc says it should be. The loaded rpm that I did hit matches the calc speed perfectly so I think the esc is not running at 100%. I will re-calibrate the esc and I will adjust the radio and try again this weekend.

Here's the vid: http://www.youtube.com/watch?v=QOc9vU1ltsY

Setup:
Motor: Leopard 2200kv
ESC: Seaking 180
Prop: x447
Batts: 2x Turnigy 4s 3600mah 30c paralleled

Data:
Speed: 44.7mph
Amps: 177.70 - max, 130-140 avg
Watts: 2583 - max
Motor: 94F
ESC: Spiked at 131.20F (suspect not running at WOT lead to high spike.) Avg @ 95F and caps where 105F with a temp gun

[Brushless55]

Wow, that's a lot of amps
it almost sounds like it's not running 100% ?

[Diesel6401]

Wow, that's a lot of amps
it almost sounds like it's not running 100% ?

Yea I don't think it was running full WOT. I re-calibrated the esc and will try it again this weekend.

Yea serious amp load, I knew it would be high that's why I run 2p on that boat. Once I get this thing trimmed out and running wot correctly should be really fun!!!
If the adjustment's I made don't work, I will prop back down to a m445.

[Brushless55]

looking forward to the new data!

[DISAR]

Looking at your diagrams - volts,rpm,amps I think

a) Throttle calibration is not correct, because if you look at your packs volts average is 15.66 Volts, multiply that by 2200 is 34,452 rpm but you have only about 20,000 rpm. This is a big difference. this also concludes the following:


1) Lipo cut off in esc? set to manual or auto?
2) Motor is defective
3) Something wrong in the drive line blocking the shaft to rotate

b) Propeller too big, the motor cannot rotate it that's why pulling a lot of amps. However a 447 is not that big for this motor.

I would first recalibrate, set the esc to manual cutoff 4s, check shaft and if still same condition it's the motor. That's a lot of amps for 20000 rpm, but the rpm reading may be wrong? Lots of information bring confusion sometimes

[Matt_1234]

hey how you going, i am thinking of putting this motor in a 25" prince deep vee stock hardware except it will have a bigger prop and carbon kevlar inside to strengthen hull. How do you think this motor would go in my 25" deep vee? i rekon its the best choice cause i wont have to worry about heat issues and i will have a fair bit of speed and i can put a bigger prop on it! also will i have to upgrade any of the hardware or should i just leave it how it is. It seems to handle very well and seems to be decent hardware!! thanks alot
matt

[martin]

hey how you going, i am thinking of putting this motor in a 25" prince deep vee stock hardware except it will have a bigger prop and carbon kevlar inside to strengthen hull. How do you think this motor would go in my 25" deep vee? i rekon its the best choice cause i wont have to worry about heat issues and i will have a fair bit of speed and i can put a bigger prop on it! also will i have to upgrade any of the hardware or should i just leave it how it is. It seems to handle very well and seems to be decent hardware!! thanks alot
matt

This motor is way to big & to powerfull for a 25" Prince hull, Youll just end up torque rolling the boat + you will just tear the shaft. The shaft is to small for this motor.

[Diesel6401]

Looking at your diagrams - volts,rpm,amps I think

a) Throttle calibration is not correct, because if you look at your packs volts average is 15.66 Volts, multiply that by 2200 is 34,452 rpm but you have only about 20,000 rpm. This is a big difference. this also concludes the following:


1) Lipo cut off in esc? set to manual or auto?
2) Motor is defective
3) Something wrong in the drive line blocking the shaft to rotate

b) Propeller too big, the motor cannot rotate it that's why pulling a lot of amps. However a 447 is not that big for this motor.

I would first recalibrate, set the esc to manual cutoff 4s, check shaft and if still same condition it's the motor. That's a lot of amps for 20000 rpm, but the rpm reading may be wrong? Lots of information bring confusion sometimes

Great info.
Last night I was checking out my radio (ds3x) and going to re-calibrate the throttle on the esc and I was checking my settings and i found the digital throttle trim at -4 on the radio. Not sure but that could be an issue. I re-calibrated the throttle as well 0 everything out and will try again this weekend. I def thing it's radio/esc not on the same page kind of issue. To add some more info im pretty sure their is no binding in the drive and the shaft was lubed prior to the run. Also the collet was not slipping. The esc has 8 runs on it and the motor has 4 runs it. O too add the esc lvc is set to manual.

hey how you going, i am thinking of putting this motor in a 25" prince deep vee stock hardware except it will have a bigger prop and carbon kevlar inside to strengthen hull. How do you think this motor would go in my 25" deep vee? i rekon its the best choice cause i wont have to worry about heat issues and i will have a fair bit of speed and i can put a bigger prop on it! also will i have to upgrade any of the hardware or should i just leave it how it is. It seems to handle very well and seems to be decent hardware!! thanks alot
matt

Overkill, way too much. A smaller motor would be more practical.

[Matt_1234]

well i have a feigao 380 7xl that i have never used! what do you rekon about that motor with the stock 35mm prop on 3s?

[Diesel6401]

well i have a feigao 380 7xl that i have never used! what do you rekon about that motor with the stock 35mm prop on 3s?

Please:

Reference for your motor questions:
http://forums.offshoreelectrics.com/...ad.php?t=21584
http://forums.offshoreelectrics.com/...ad.php?t=21635
http://forums.offshoreelectrics.com/...ad.php?t=21664
http://forums.offshoreelectrics.com/...ad.php?t=21892
http://forums.offshoreelectrics.com/...ad.php?t=22054

*Just run the boat the way it is!*

[Matt_1234]

but i have seen a boat with a feigao 540 8xl running and it seems to have no signs of torque roll. and it has a x440 prop on it so its been proped up a bit. ill try find you the link. http://www.youtube.com/watch?v=IDjcg...eature=related
unless thats a 380 8xl brushless but i seriuosly doubt it.

[Diesel6401]

Ran the boat again today (minus the eagle tree). The eagletree is rated at 150 amps and I was pulling over that. I didn't want to risk damage to the eagletree.

On the positive speed was 49.0mph! Only adjusment I made was the re-calibration to the esc. Seemed that was my issue... Sweet!

[JackBlack26]

Awesome, Diesel!! I found out recently that if I plug in the ESC, T-180, before I turn on the radio gear it can lose the bind between the ESC and transmitter. My genesis wasn't going full throttle and that was the issue.

I need to get one of those data loggers.

[Diesel6401]

Awesome, Diesel!! I found out recently that if I plug in the ESC, T-180, before I turn on the radio gear it can lose the bind between the ESC and transmitter. My genesis wasn't going full throttle and that was the issue.

I need to get one of those data loggers.

WOW I didn't know that. Good find.

Yea those data loggers are pretty cool. Really made finding the problem easy. I just got check the amp rating on that thing. I wonder if it has a burst rating. It's rated at 150amps but it logged the 177 amp spike I had. The unit was rather warm after that run.

[Andrewg]

Dont worry about your ET logger. I am putting more than 4.5 kilowatt through mine and it seems ok! The newer ET 150 V3's log up to at least 220 amps.

You might want to try it again. You can get a little more fropm it. Motor amps of approx 130 with that prop (try low timing ) and rpm of at least 28100 at top speed show its running at peak efficiency at top speed - if your low prop speed say through a turn is 28000 and it winds - then you are running it about as efficiently as yu can

Also is the prop cut or B&S? Even stock you should be able to run over 50 mph. On the other hand you might want to blueprint the hull running surfaces and show us all the efficiency dividend ??? the model should pick up some speed or at least drop a few amps