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P47 - Electric Conversion.

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Happy Days:
Any progress on the P47 yet Dave?

L. Keith

davegrennan:
Hi LK,

Did you see the progress in my post from May 22nd?  I'd be very interested in your opinion on some of the issues I raised in that post.  Been a busy bot in work since then.  Hopefully more progress later in the week.

Cheers...
Dave.

Happy Days:
Hi Dave,
it all looks pretty good to me. The only “points of difference” that I can think of are………..

On the firewall:……… the ESC seems to be held in place by a single oversized washer. I’d probably remove the screw, drill a hole on the opposite side of the ESC and secure the ESC with a strong cable tie. (Don’t want the ESC shaking loose after a heavy landing )
And while talking about that area of the plane,….I suggest you’ll need another ‘airflow’ hole in the firewall to allow a good volume of cooling air to exhaust from the cowling into the fuse. The cooling air will likely need somewhere to exit from the fuselage as well. :wink:

Now you may already know this, in which case please forgive me mentioning it, but the firewall will have been built not at 90 degrees to the fuselage. This is done to produce a Thrust Angle. (Normally a few degrees towards the right hand side of the fuse, hence it’s called the Right Thrust angle.  It’s important therefore that your motor stand off rods are all  exactly  the same length to enable the motor shaft to be at the correct axial angle to the fuse. But like I say, you may already know this.

In terms of the rudder pull - pull system. Whenever I’ve found such cables rubbing I’ve used the little plastic ink tube found inside cheap ball point pens to run the cables through. These ink tubes are just the right size and are made of quite tough plastic. Bit messy flushing the ink out of them though! :(

Like I said Dave these points are not criticisms, just points of difference. “Horses for Courses” sort of thing. :D

Good Luck with the rest of the build :clap:
L.Keith

davegrennan:
Hi Keith,

Thanks for the feedback.  Yes the washer on the ESC is only temporary, a couple of cable ties will be employed.  Good point re airflow, I'll make some more holes.

Regarding the right thrust, the odd thing is it doesn't look like there is any by default.  The standoffs were machined up on my lathe and are all the same to 1/100mm.  I might need to knock a small bit off two of them if there is no right thrust by default. I'll have to get  the t-square out to check.

Thanks for the idea re the sleeve for the pushrods, sounds like a champion idea.

Hopefully some more progress this weekend.  In fact I don't see why I can't finish it.  I do plan to do a bit of airbrushing.  At some point I might even redo the covering as it's a little bit tatty.  That's another day's work.

Cheers.....
Dave.

Happy Days:
Hmmm,…regarding the Right Thrust Dave, :?: …..

If the firewall is at 90 degrees to the longitudinal axis of the fuse then I’d say there is a fair bet that this particular model doesn’t need any Right thrust. (Not every model does)

I think if I were in your shoes, and the motor mounts are to within 1/100mm (pretty tight tolerance that :clap:  ) then I’d finish the model ‘as is’ and see how it flys.
 Normally any lack of Right Thrust, (or down thrust, left thrust, or up thrust) becomes apparent when power is increases or decreased from level trimmed flight.

L. Keith

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