RunRyder RC
WATCH
 1 page 665 views POST REPLY
HomeAircraftHelicopter
e-
Thunder Tiger
Raptor E325 › MT ESC Hot. Please Help.
04-02-2009 01:13 AM  9 years agoPost 1
mydartswinger

rrApprentice

Fort Bragg, NC - USA

My Posts: All  Forum  Topic

I recently built a Mini Titan using an e-Flite 420 motor (3800kv)/25A ESC (both stock Blade 400 gear), Thunder Power 2100mAh 3S 11.1V 20C (42A continuous)/40C (84A burst) battery, a 15T pinion, and a 150T main gear (10:1 gear ratio). This combo calculates out to a headspeed of 3374 RPM.

I have my normal mode set for 80% throttle/+10° pitch at full collective (2700 RPM by throttle calculations) and my idle 1 is set at 80% throttle/-6° pitch @ low collective (2700 RPM), 70% throttle/+5° pitch @ mid stick (2362 RPM), and 100% throttle/+10° pitch @ full stick (3374 RPM).

Hovering for about 1 minute in normal mode, then about 2-3 minutes in idle 1 causes the ESC to slow down the motor. If I let it set without inputs for 30+ second, I can fly for about another minute. At the end of this, the battery and motor is warm, but able to be touched for well over 10 seconds each. The ESC, however, can only be touched for 2-3 seconds before my finger gets too hot to keep it there.

Any suggestions as to what could be causing this?

Thanks in advance.

Stop Playing Lawn Darts!!! AMA #909181
http://www.davisbridgeaeromodelers.com

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2009 01:58 AM  9 years agoPost 2
co_rotorhead

rrVeteran

Centennial, CO, USA

My Posts: All  Forum  Topic

The way I see it, as your throttle percentage changes back and forth along your throttle curves, your ESC is constantly working. Usually, idle-up 1 and 2 curves are set as a straight percentage across the entire curve (i.e. 80% in idle 1, 90-100% in idle 2 across all stick positions). With the idle-up curves set as a straight percentage, the ESC doesn't have to do any work once it hits its target percentage.

I've always found that flying around in normal mode with a gradually increasing throttle percentage heats up the ESC quite a bit. YMMV.

That 15T pinion probably isn't helping either. If you're not flying hard 3D, you may want to try a smaller tooth pinion.

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2009 02:11 AM  9 years agoPost 3
mydartswinger

rrApprentice

Fort Bragg, NC - USA

My Posts: All  Forum  Topic

I've got 2 other pinions to choose from. The stock e-Flite pinion is a 10T that would give me 2250 RPM at 100%. The 13T should give me up to 2934 RPM @ 100%. Next flight, which should be tomorrow afternoon, I'll give the 13T pinion a shot.

Thanks for the reply.

Stop Playing Lawn Darts!!! AMA #909181
http://www.davisbridgeaeromodelers.com

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2009 03:01 AM  9 years agoPost 4
nappyroots2182

rrElite Veteran

Moline, il

My Posts: All  Forum  Topic

the motor my be ok for now for power but the esc is borderline too small. when you can afford it get something abit bigger. one crash due to buring out your small esc will cost more then buying a esc now. scorpion 45amp or quark 33 are my favorites. even align escs are great for the money

PM  EMAIL  GALLERY  Attn:RR  Quote
04-02-2009 05:06 AM  9 years agoPost 5
fenderstrat

rrProfessor

Aston,Pa

My Posts: All  Forum  Topic

the stock esc that comes on a MT is 40A with a 3500kv motor and 13T pinion

you are running a 3800kv motor on 15T with a 25A esc

you are pulling too much from the esc,and it wont like being heated up for very long

Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD

PM  EMAIL  GALLERY  Attn:RR  Quote
04-05-2009 01:49 AM  9 years agoPost 6
january flyer

rrApprentice

Lake Charles Louisiana 70601

My Posts: All  Forum  Topic

A UBEC might help you drop your temp. I know running all digital servos in my all stock E325-SE, and when I was just doing some very slow kind of hovering flight, when I was breaking in my Battery packs, I was getting 156 temp on the ESC, and my motor and battery was just a little warm, but when I put in the UBEC in it dropped the ESC to 115. It just might help a little. Take care!

Team JR, Thunder Tiger America, Scorpion, Skookum Robotics, Savox, RC Aerodyne, Sirocco, SpinBlades

PM  EMAIL  HOMEPAGE  GALLERY  Attn:RR  Quote
04-05-2009 02:10 AM  9 years agoPost 7
mydartswinger

rrApprentice

Fort Bragg, NC - USA

My Posts: All  Forum  Topic

Thanks for the replies.

I've been trying to fine tune it all this week. I managed to get the temp dropped by bringing down the headspeed to about 2300-2400 (from closer to 2800-3000). However, I'm now starting to see the pinion coming loose from the motor. The motor shaft is 2mm, while the pinions are 1/8" (about 3mm). I wrapped some tape around the shaft (I know, not the best idea. I'm kinda redneck like that sometimes), and that worked until the heat made the glue on the tape come loose, causing the pinion to slip. I tried electrical tape at first, but the heat practically melted the tape. Next I tried masking tape, but the heat loosened up the glue after the first 2 minutes. The heat on the motor is not that much, but enough to cause problems with the tape.

I looked into putting the stock e-Flite pinion on, and just deal with the headspeed for now. However, the e-Flite pinion is too short to reach the main gear. I even looked at sliding the motor back far enough to run the tail gear, but it wouldn't slide back far enough.

Looks like I'll have to wait until I can get a new motor. Hopefully, my LHS will have the Align motor/ESCs in stock on Monday.

I also realized that I had the pinion backwards in my mind. I actually have the 13T installed.

If it weren't for the shaft size differences, I might try the 40A ESC and/or UBEC.

Stop Playing Lawn Darts!!! AMA #909181
http://www.davisbridgeaeromodelers.com

PM  EMAIL  GALLERY  Attn:RR  Quote
04-05-2009 03:38 AM  9 years agoPost 8
steveoz

rrNovice

Sydney,Australia

My Posts: All  Forum  Topic

You can try using aluminium foil to shim your motor shaft,cut it into a strip and wrap it tightly around the shaft until you get a good fit.It's fiddly ,but works better than adhesive tapes .
Word of warning; I have not used this on high RPM motors like we use.I have done it successfully on other smaller motors.I would really recommend either getting the right size pinion or the right size motor.
It sounds like your pushing the Blade gear to its limits though, and might need to get a new ESC and motor.

Gravity,the unknowen variable.

PM  EMAIL  Attn:RR  Quote
04-06-2009 01:14 AM  9 years agoPost 9
mydartswinger

rrApprentice

Fort Bragg, NC - USA

My Posts: All  Forum  Topic

Believe me, I do plan on getting a new motor and ESC. It's just that around here, though my LHS is a good one, I generally have to order a lot of helicopter items. It's mostly planks, cars, trains, and models here. My LHS does stock a full line of e-Flite helis and parts, as well as a few Align, Thunder Tiger, and Hirobo parts (though not near everything that I need in a crash). They don't always have heli motors in stock. I checked the other LHS in town yesterday, only to find that he didn't have any high KV motors other than the e-Flite 420, which is what I'm currently running. He also only had one 40A ESC, a The World Models ESC for planks and helis. I plan on checking out the main LHS tomorrow to see if they've gotten any in.

Stop Playing Lawn Darts!!! AMA #909181
http://www.davisbridgeaeromodelers.com

PM  EMAIL  GALLERY  Attn:RR  Quote
04-06-2009 02:05 AM  9 years agoPost 10
fenderstrat

rrProfessor

Aston,Pa

My Posts: All  Forum  Topic

if the motor shaft is the 2.3mm size(3.2mm is the larger) ,and your LHS carries e-flight stuff,can't you get a 2.3Mm pinion?

I'm all for saving money and cheap fixes and home remedies,but trying to do what you are attempting is asking for a crash,is a 5 dollar pinion worth wrecking a heli?

Compass helis Support Team
PerformancePlusRC field rep
Mini Titan/SE
TEAM KBDD

PM  EMAIL  GALLERY  Attn:RR  Quote
04-06-2009 02:42 AM  9 years agoPost 11
mydartswinger

rrApprentice

Fort Bragg, NC - USA

My Posts: All  Forum  Topic

e-Flite's largest pinion is only an 11T and not long enough to reach the main drive gear. They also don't have any other selection of pinions.

I'm hoping that tomorrow they'll have an Align motor and ESC tomorrow.

Stop Playing Lawn Darts!!! AMA #909181
http://www.davisbridgeaeromodelers.com

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 665 views POST REPLY
HomeAircraftHelicopter
e-
Thunder Tiger
Raptor E325 › MT ESC Hot. Please Help.
 Print TOPIC  Make Suggestion 

 4  Topic Subscribe

Thursday, September 20 - 4:18 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online