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Old Jul 12, 2005, 10:55 PM
Kickin It Ol'Skool
lensrc's Avatar
Kansas City area
Joined Nov 2001
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New Feature for LensRc Motors

Well, I have been up late for a few nights working on this. I have needed to do this for a long time, and finally found the time to get it started. I managed to get some tooling made to punch cooling holes in the stock GB cans, and will be offering this on my motors as a no-cost option on most, but will be standard for the 8t motor. I hope it will allow the use of the 8t on tractor setups, with the same performance as in pusher.



I also have another little "experiment" in the works that I have seen suggested in these forums a few times. I followed up the hole punching tooling with a set of tools to punch "louvers" ajacent to the holes for "active cooling". Will be testing this over the next week or two, and will also offer it as an option if it proves to be benificial. As you can see in the demo pic, it definately moves air through the motor. What I need to find out is if it provides enough extra cooling to push the motors further. Stay tuned!







I tried to take a pic using smoke, but it just would not show well enough, so I had to use flame.......
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Old Jul 12, 2005, 11:07 PM
↓↘→ + (punch)
theKM's Avatar
central PA.
Joined Sep 2004
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excellent! that's exactly the result I was looking for when I pinged you for cooling holes!

...how about double punch the holes to elongate them, and then the louver punch?... just that there's a little room in front of the louvered hole that could help drive air through it... or... if there's room in front of the stator, punch the rear of the louver hole in from the front, so it's more properly "ducted" from the front of the hole to the back. Methinks that it may better form the low pressure area at the start of the hole before the back of the scoop sweeps over it.

...either way, lookin good!
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Old Jul 12, 2005, 11:10 PM
↓↘→ + (punch)
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central PA.
Joined Sep 2004
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...now you'll have to ask people if they want left or right hand rotation
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Old Jul 12, 2005, 11:11 PM
Good Better Best quest.
olmod's Avatar
Australia, VIC, Cranbourne East
Joined Apr 2004
10,346 Posts
hehehe

Now thats cooking with gas but seriously anything to keep the copper cooler can only be a benefit, as copper increases with temperature so does its resistance therefore lower temps' = efficiency.
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Old Jul 12, 2005, 11:11 PM
↓↘→ + (punch)
theKM's Avatar
central PA.
Joined Sep 2004
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just thinking about the times that I've really pushed the 17t... I reckon this will have excellent practical results in flight, and certainly help keep the magnets cool.
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Old Jul 12, 2005, 11:15 PM
Lawn darts, anyone?
Long Island, NY U.S.A.
Joined Oct 2003
647 Posts
Len,

Your flame demo sure looks like a convincing Proof of Concept demo.
Congrats for the innovation, which should yield higher performance.
Looking forward to your test results. /jb/
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Old Jul 12, 2005, 11:21 PM
Kickin It Ol'Skool
lensrc's Avatar
Kansas City area
Joined Nov 2001
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Quote:
Originally Posted by theKM
excellent! that's exactly the result I was looking for when I pinged you for cooling holes!

...how about double punch the holes to elongate them, and then the louver punch?... just that there's a little room in front of the louvered hole that could help drive air through it... or... if there's room in front of the stator, punch the rear of the louver hole in from the front, so it's more properly "ducted" from the front of the hole to the back. Methinks that it may better form the low pressure area at the start of the hole before the back of the scoop sweeps over it.

...either way, lookin good!

The longer hole might be worth looking at, but there is no room for a secondary opposit louver inside the can. Once I get a hole design that seems to work best, I will look at having the tooling combined and made by the machine shop. That is, if I can afford it! If not, I have a friend with a larger lathe with a few more options to get a better set of tools made. I do have to be able to do this in a timely fashion! You know what they say,
"Time is Money!"

Len
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Old Jul 12, 2005, 11:25 PM
Kickin It Ol'Skool
lensrc's Avatar
Kansas City area
Joined Nov 2001
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Quote:
Originally Posted by jbatch
Len,

Your flame demo sure looks like a convincing Proof of Concept demo.
Congrats for the innovation, which should yield higher performance.
Looking forward to your test results. /jb/

It is cool, aint it?

Len
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Old Jul 13, 2005, 12:04 AM
Flying motor mount master
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San Jose, California, United States
Joined Oct 2004
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Len-

What kind of stats you have on the 8T??

fb
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Old Jul 13, 2005, 12:04 AM
INDORUS EXPARAMINTO
SPEED-E-FLYER's Avatar
Springfield, Missouri, United States
Joined Jul 2002
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That is just Too Cool
Looking forward to the results

Larry
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Old Jul 13, 2005, 12:11 AM
Kickin It Ol'Skool
lensrc's Avatar
Kansas City area
Joined Nov 2001
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Quote:
Originally Posted by fly_boy99
Len-

What kind of stats you have on the 8T??

fb
GWS 4x2.5 Direct Drive Prop
on 3S1P Lipo Battery:
26,000 RPM 61 MPH Pitch Speed
10 Amps 105 Watts
11.5 Ounces of Thrust


GWS 3x3 Direct Drive Prop
on 3S1P Lipo Battery:
29,000 RPM 82 MPH Pitch Speed
8.5 Amps 89 Watts
7.5 Ounces of Thrust


GWS 4.5x3 Direct Drive prop
on 2S1P Lipo Battery:
17,900 RPM 50 MPH Pitch Speed
8 Amps 53 Watts
8 Ounces of Thrust

I am flying the 2S setup now on my FJ1 pusher jet. I think I am ready to jump up to the 3S and 4x2.5.....

I havn't tried it yet, but Everyday Flyer, fellow zoner, is flying one on 3s and 4x4, on a MSW. Sounds scary to me......

Len
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Old Jul 13, 2005, 09:21 AM
homo ludens modellisticus
Ron van Sommeren's Avatar
near Nijmegen, Netherlands
Joined Feb 2001
10,147 Posts
Quote:
Originally Posted by lensrc
... What I need to find out is if it provides enough extra cooling to push the motors further. Stay tuned!...
It's a good idea anyway, the louvres will also make the can stiffer.
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Old Jul 13, 2005, 09:31 AM
Kickin It Ol'Skool
lensrc's Avatar
Kansas City area
Joined Nov 2001
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That is a good point, Ron. Had not thought of that, but it is true.

Len
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Old Jul 13, 2005, 09:53 AM
Southern Pride
everydayflyer's Avatar
Haralson County GA. USA
Joined Oct 2004
34,361 Posts
I havn't tried it yet, but Everyday Flyer, fellow zoner, is flying one on 3s and 4x4, on a MSW. Sounds scary to me......

Len
____________________________________________
Not scary ,frightening. Seriously it is a blast once you get over the shakes. I built a Speed Wing 400 ,put a Mega on it got it up to approximately 120 MPH and used it as a trainer for my Mini Speed Wing 250

This thing is wicked. I just kept adding prop and electrons until I could barely keep up with it.

Added: Please note that this is over 100 watts and while I have had no problems with heat one must use extreme care. I limit static runs to one 5 sec. one on a cold motor. In pusher mode this motor has an unlimited amount of cooling air available in flight.

Charles
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Last edited by everydayflyer; Jul 13, 2005 at 12:19 PM.
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Old Jul 13, 2005, 09:54 AM
Southern Pride
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Haralson County GA. USA
Joined Oct 2004
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Deleted dupe
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