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Old Jul 11, 2011, 07:03 PM
On loan to Texas
Ohio AV8TOR's Avatar
United States, TX, Benbrook
Joined Oct 2005
5,291 Posts
All good to know as we have been above 100 for many days. In fact I am going to make a cooling baffle tonight for my free side cowl inlet for the motor.
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Old Jul 11, 2011, 07:19 PM
doh!
ryan_m's Avatar
United States, AR, Little Rock
Joined May 2006
4,369 Posts
Quote:
Originally Posted by Ping View Post
Sorry it's actually 180C. Scorpion motors claim to use N50EH grade magnets which are good up to 200C. This is operating temps at the magnet. I start to look at my setup if the motor can is above 160C when I land. This indicates that the internal temperature in flight is nearing the danger point.

I don't know what magnets the motorfly uses but I'm sure it's the same high quality grade.
I've read that about Scorpions magnets, but I know I turned the magnets on one of them blueish. At least the back 1/3 of the magnet. And the motor temp was not over 160 when it landed, ever. That's nowhere near 200C, and yet the magnets began suffering damage.
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Old Jul 11, 2011, 07:26 PM
Sippin the Koolaid!
losifanatic's Avatar
United States, NC, Hertford
Joined Oct 2007
16,464 Posts
Quote:
Originally Posted by ryan_m View Post
KE Spins are evil. I have nicknamed that maneuver the motor killer. Nothing will heat up a motor faster than those. And on big planes like this the torque of that big prop will flex just about any motor enough to start the magnets rubbing. I've knocked more magnets loose and burned up more motors from KE spins than anything else... I don't do them in the summertime any more. It's much too hot here to do anything that causes extra motor heat, and I don't do them on any plane larger than a 51" Slick either. The larger props just seem to create too much motor flex and it ruins your motors eventually as the magnets rub on the stator.
Quote:
Originally Posted by ambientech View Post
The only motors I have killed have been during a KE spin. The Hacker A50 motors have a concentric bearing so no way to knock magnets off but I still don't do them.
Dont say that I was doing them with the 71 and 89
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Old Jul 11, 2011, 08:08 PM
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Ping's Avatar
Indianapolis
Joined Aug 2004
481 Posts
Here is a good site with info on magnets. http://www.kjmagnetics.com/blog.asp?...dymium-magnets this chart shows temps on the various grades
http://www.kjmagnetics.com/specs.asp

This all assumes scorpion is using the n50eh grade magnet that they claim. I've stuck to the 160 rule in all my scorps and never had a non bearing failure. I fly them mostly in large helis where cooling becomes a big deal.

The blueing damage is probably just the surface metal the magnets are plated with.
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Old Jul 11, 2011, 08:16 PM
You're good!
Safety Hawk's Avatar
United States, VA, White Stone
Joined Jun 2005
6,894 Posts
Quote:
Originally Posted by Ping View Post
Here is a good site with info on magnets. http://www.kjmagnetics.com/blog.asp?...dymium-magnets this chart shows temps on the various grades
http://www.kjmagnetics.com/specs.asp

This all assumes scorpion is using the n50eh grade magnet that they claim. I've stuck to the 160 rule in all my scorps and never had a non bearing failure. I fly them mostly in large helis where cooling becomes a big deal.

The blueing damage is probably just the surface metal the magnets are plated with.
A motor in a helicopter doesn't have to handle the gyroscopic precession of a plane since it only has a pinion.
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Old Jul 12, 2011, 12:14 AM
Yeeah buddy!
PinkYakRC's Avatar
Northern Colorado
Joined May 2010
2,451 Posts
Just wondering,

have any of you hurt a servo from dragging the rudder on the ground?
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Old Jul 12, 2011, 12:20 AM
I fly, therefore, I crash!!!
SteveT.'s Avatar
San Jose, CA
Joined Jan 2008
27,187 Posts
Quote:
Originally Posted by PinkYakRC View Post
Just wondering,

have any of you hurt a servo from dragging the rudder on the ground?
No....but I wish I could.... (drag the rudder on the ground that is... )

SteveT
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Old Jul 12, 2011, 07:58 AM
nsg
Registered User
Yardley, PA
Joined Sep 2006
4,162 Posts
For those of us running a Hacker A50-14L (or another ~300kV motor) on 8 cells.. what props do you use?
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Old Jul 12, 2011, 08:01 AM
OOPS
Manta1's Avatar
USA, GA, Cochran
Joined Jun 2008
20,170 Posts
I'm running a 20x8 carbon prop on my motrolfly
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Old Jul 12, 2011, 08:13 AM
nsg
Registered User
Yardley, PA
Joined Sep 2006
4,162 Posts
Manta - that's on 4325-310, right?
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Old Jul 12, 2011, 08:46 AM
ADC Vinyl
Fliprob17's Avatar
SoCal-Rancho Santa Marg.
Joined Mar 2007
5,229 Posts
ADC Fuse Bags

If anyone is interested we are now making Fuse Bags to match the Wing Bags we have been making for the last few years. The size we have up on the SITE now is adjustable from the 62" Osiris to the 72" Extra.

Rob
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Old Jul 12, 2011, 08:48 AM
ADC Vinyl
Fliprob17's Avatar
SoCal-Rancho Santa Marg.
Joined Mar 2007
5,229 Posts
Quote:
Originally Posted by nsg View Post
For those of us running a Hacker A50-14L (or another ~300kV motor) on 8 cells.. what props do you use?
18x8 gave me about 2300watts on 40C packs
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Old Jul 12, 2011, 09:54 AM
Go Fly Yourself...!!
xxD-Manxx's Avatar
United States, WA, Bonney Lake
Joined Oct 2004
1,544 Posts
Quote:
Originally Posted by Fliprob17 View Post
If anyone is interested we are now making Fuse Bags to match the Wing Bags we have been making for the last few years. The size we have up on the SITE now is adjustable from the 62" Osiris to the 72" Extra.

Rob
Rob Great idea!
It would be nice to carry both Fuse and wings in each had to and from the Van.

How is the Fuse Bag fastened?
by Velcro or some other way?

It would suck to have the fuse drop out the bottom of the bag in route to and from the field.

You know... if the carry straps wrapped around the bottom of the bag and the bag opening at the top... I'd hit the buy button and order one for my 72" Extra330sc today!

D-Man
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Old Jul 12, 2011, 10:25 AM
Long Duck Dong
Choppedlow's Avatar
Yuma, Arzmexico
Joined Aug 2010
51 Posts
Those bags are a great idea!
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Old Jul 12, 2011, 12:42 PM
You're good!
Safety Hawk's Avatar
United States, VA, White Stone
Joined Jun 2005
6,894 Posts
Nice! You can throw it over your shoulder like a pocketbook..........uh...I mean Man Bag.
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