Extra 300 Electric Conversion

Thinking what can I do with this now redundant 63mm 192kv motor sitting unused in the drawer. i need something to wrap around it. So here goes......The selected model is designed specifically for "gas" engines in the 30 - 40cc range but conversion should not be to much effort. :whistle:

Mounting the X plate on to some spare DLE stand-offs. Then create a firewall drilling template. The stand-offs are loosely fitted but the machine screws will be "Loctited" when final alignment has been confirmed.

Engine box had to be modified with some cut-outs to allow for the large flat washers that even out the load when the machine screws are tightened up. Image 1

Lite-ply needed to make up some spacers for the prop drive to cowl clearance. Image 2

Speed controller in place. (Since then I have moved it underneath for better air flow and the space is most likely needed for the receiver batteries) Image 3

Checking prop drive face with cowl. Image 4

What make of Extra is that Phil??

Photo shows new location of ESC. Image 1.

Image 2. Initial trial fit of 2 x 6 cell 5000 mah batteries to pre-check C of G before proceeding with planning adding the ancillaries. Even with these packs wieghing at 1600 grams it appears to want a 150 grams more up front to give a little nose-down on balance. Receiver packs then! The 6374 192 kv motor weighs in at 920g which is 200g less than the DLE engine.

I was hoping to use 2 x 5 cell 5000 mah 30C packs but they would not be heavy enough. Worry about that later . May stick with packs I have already rather than splash out more cash for even more batteries.

Top hatch now glued in position. Image 3. The engine box will be glassed later.

Receiver located and servos connected to verify travel. Image 4.

What is it? Pilot RC Extra 300 24%

Chris73 wrote: What make of Extra is that Phil??

Waiting on seeing Jon to try some props so I can measure amps and thrust. A nice light prop in the 21x 12 range I think, maybe, possibly, don't know. Tried a Biela 18x8W and the motor didn't even know it had a prop...:lol:

It'll be interesting to see how that compares to my EF 78" Extra Phil, must be a similar size?

JonTappin wrote: It'll be interesting to see how that compares to my EF 78" Extra Phil, must be a similar size?

Ah Yes. Your EF. What prop and cell count are you using?

PhilF51 wrote: ]

Ah Yes. Your EF. What prop and cell count are you using?

APC 20 x 10 and 10s 5000mah

I read up details on the EF Extra. Recommend an Xpwr 40cc Electric Motor on 10 cells with 22 inch Beech e-prop. Hacker would be A60 series. These motors use 8mm shafts - not sure about adaptor sizes though.

This afternoon before darkness fell, been trying to get the thing balanced (155mm back from leading edge or 20mm back from wing tube). I can get some slight nose down with those 2 x 6 cell packs when the batteries are just forward of the wing tube. Allowing for a 200 gram Lipo receiver pack behind the wing tube it "should" be about right.

In case Jon's props are not for 10mm shafts I have located an Xoar Beech - E 21 x 10 at Probuild , so going to try that initially in conjunction with my clamp meter. Flying weight according to my wife's digital scales is 6.5kg

Could be a maiden soon.........