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!

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.

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.

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.  
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.

Lathe is the correct way to do this.  Great Planes spinners with the alum backplates are pretty easy to work on and stay true.