stunthanger.com
Electric Stunt => Gettin all AMP'ed up! => Topic started by: Dennis Adamisin on May 12, 2012, 08:01:21 AM
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Frank Imbriaco took the lead on this, he asked me to get involved when Tru-Turn had some questions about our LH props.
Anyhow, Tru Turn is now able to produce their Turbo Cool spinners for LH rotation props. To do this they have to reverse the shape of the fan vanes in the backplate so they work with opposite rotation.
From the emails I exchanged with Tru Turn (Bob Obenberger) It seems clear that we MUST be very clear with them about what we want them to do. Bob suggested that we specify that we are using a LH rotation prop on the front of the airplane. Make the effort to be clear!
If you call it a pusher prop you are likely to get a spinner with the prop slots cut backward so it works on the back of the airplane!
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Dennis,
Like this?
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One more bit of info. If you are front mounted, the TT "ELECTRIC ADAPTER KIT" may not work out. Seems as though it was designed for the "X Mounts" that are typically included with motors that are intended to be rear mounted.
As Dennis said, the standard issue Turbo spinners are set up for tractor props .
Currently, TT( ROMCO MANUFUCTURING) is busy with large contract work(GE,etc.) and it'll likely take awhile to get special orders completed for custom U/C electric applications.
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Hi Denny
In your opinion is the additional cooling from this setup worth the additional cost of the spinner? By the way has TT given you any cost estimates for the new backplate and spinner combo? Being retired I have become very cost concious.
andy
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Hi Denny
In your opinion is the additional cooling from this setup worth the additional cost of the spinner? By the way has TT given you any cost estimates for the new backplate and spinner combo? Being retired I have become very cost concious.
andy
Hi Andy
There are lots of ways to get air to the motor. Indeed, a properly sized (or slightly oversize) motor does not generate a lot of heat to begin with. I think the TurboCool would help if all else failed - if there was no other way to get a good cooling air stream to the motor. I have had luck simply cutting the nose of a normal plastic spinner and using it for ram air to the motor. (see pix). My brother did a real nice job slotting a plastic spinner enabling it to pump air into the front of the motor. Personally I have much more trouble creating good air exits!
One "accidental" feature is that the TurboCool design removes a sizable piece of the shell - it should be LIGHTER!
As for prices & such, Tru Turn has pricing for TurboCool on their website. I do not know if they will upcharge for the LH rotation (Frank???) since it is simple(?) mirroring of their existing NC program.
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That depends on the size of the spinner. Mine are 2" spinners and the cost $40 each. Its $9 extra for the spinner cutout and the Turbo Cool cutout each. Yours will cost more than mine cause I live three miles from there and I pay cash. But it does make a difference for motors that doesn't have a direct flow of air to the motor.
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I've been using one of these Tru-Turn spinners for quite a few months now (just after they were released) and it seems to work well.
My motor runs cool but of course it is hard to tell if it runs cooler with this spinner. ;D
When I bought mine they were only making them in the normal silver color, but I painted mine to match the plane.
PS: Mine is for a pusher prop and with the narrow slots for the APC.
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Dennis
I liked the way to opened up the from of the plastic spinner. I would like to use that idea on the Continental. Did you do it on a lathe? Let me know how you did it. My lathe is still on the garage floor, but Larry Renger's is up and working.
Andy
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Lathe is the correct way to do this. Great Planes spinners with the alum backplates are pretty easy to work on and stay true.
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I just tried out a 2.5" turbo cool spinner, and it lowered the motor temp by about 10 degrees (F) compared to a standard TT spinner. Mine is used on a 64oz Legacy with an E-flite Power 25. With all the custom machining charges, this is a rather expensive spinner, and I am not sure its cooling effect was worth either the expense or the wait time (3 weeks in my case), but like all TT spinners, it is a work of art.
Bob