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Author Topic: Frank's EP Supersportster re-build  (Read 195 times)

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Offline Frank v B

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Frank's EP Supersportster re-build
« on: November 03, 2018, 08:54:57 pm »
An old electric plane magically fell into my car.  Have decided to re-build it.

How it was- it had a geared brushed motor, the red covering was bleached almost white by the sun, the tires were foam but disintegrating.... perfect for a re-build.

Project definition: am going to recover it, install a Rimfire 42-50-600 (Power 32 equiv.), maybe add retracts since I have two pairs of salvaged electric retracts.

Just in case you are wondering why the massive power.  Converting a brushed motor airplane to a brushless power system creates a balance problem.  Brushed motor conversions always come out tail heavy.  Nothing better than increasing the motor size.  On 3 S it would be 375 watts, on 4 cells it would be 500 watts and on 5 cells 650 watts.  Lots of opportunities to fine tune the power equation.  It was originally designed for about 180 watts.

Will strip the covering from the wing so I can add the retracts and re-inforce the wing.

Stay tuned.


Frank
« Last Edit: November 03, 2018, 09:01:14 pm by Frank v B »


"Never trade luck for skill"

Offline Frank v B

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Re: Frank's EP Supersportster re-build
« Reply #1 on: November 05, 2018, 10:31:04 pm »
Keep going.....

- stripped all the covering off the fuselage, wings and stab.
- re-built the nose and made a new firewall.  The distance was easy to calculate- I put the back of the prop in the same place as the old brushed motor.
- drilled the shaft hole and installed the motor.
- stripped the wing and cut the starboard (right) wing bottom open to fit the retracts.  Method- open up the hole in one wing half, install the bracing, install the retracts, make sure they work, cover the opening, make the wheel well.  Then if everything works... duplicate the same mistakes on the port side and install it the same way. :)

Note: I went to the centre rib because I want the bracing to get to the centre so I can fibreglass it for strength.

Frank

"Never trade luck for skill"

Offline Frank v B

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Re: Frank's EP Supersportster re-build
« Reply #2 on: November 05, 2018, 11:01:34 pm »
Starting the cowl

To make a cowl removable, there must be a ply back plate to it.  The magnets and registration pins will be drilled into this ring.

- Took a random piece of balsa wood (3/32) larger than the cowl diameter and cut a hole with a Dremel sanding drum until it fit around the X mount, wires and vent holes.
- turned the plane upside down while holding the piece of balsa in place.  Ran a pen around it to roughly mark the perimeter of the fuselage/firewall.

This piece of balsa will be used as a template to cut out the plywood ring.

The outside diameter does not need to be accurate because it is easier to sand when the whole cowl is ready to be sanded to shape.
"Never trade luck for skill"

Offline Andy Hoffer

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Re: Frank's EP Supersportster re-build
« Reply #3 on: November 06, 2018, 09:45:55 am »
Starting the cowl

To make a cowl removable, there must be a ply back plate to it.  The magnets and registration pins will be drilled into this ring.

- Took a random piece of balsa wood (3/32) larger than the cowl diameter and cut a hole with a Dremel sanding drum until it fit around the X mount, wires and vent holes.
- turned the plane upside down while holding the piece of balsa in place.  Ran a pen around it to roughly mark the perimeter of the fuselage/firewall.

This piece of balsa will be used as a template to cut out the plywood ring.

The outside diameter does not need to be accurate because it is easier to sand when the whole cowl is ready to be sanded to shape.

Very cool Frank!   You can also do this by spreading cheese or peanut butter on the back plate where you want to remove material and leave it out for a mouse to gnaw on.  This method will give much more entertaining photos.  You could even try a time lapse movie series!!   :D  Andy

Offline Frank v B

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Re: Frank's EP Supersportster re-build
« Reply #4 on: November 06, 2018, 09:12:11 pm »
Andy,

re: your "...and leave it out for a mouse to gnaw on."

Like this??


Frank (Who else?)
"Never trade luck for skill"

Offline Andy Hoffer

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Re: Frank's EP Supersportster re-build
« Reply #5 on: November 06, 2018, 09:24:05 pm »
Andy,

re: your "...and leave it out for a mouse to gnaw on."

Like this??


Frank (Who else?)

Perfect!  Aside from a modest focus issue on the first photo, your images are getting better and better all the time!  You are a good student!!  8)  Andy

Offline Frank v B

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Re: Frank's EP Supersportster re-build
« Reply #6 on: November 06, 2018, 09:27:26 pm »
Andy,

re:  "Aside from a modest focus issue on the first photo"

It will automatically be in focus after one beer. ;D  You have obviously been abstaining.

Thanks, Teach.
« Last Edit: November 06, 2018, 09:31:06 pm by Frank v B »
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Offline piker

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Re: Frank's EP Supersportster re-build
« Reply #7 on: November 07, 2018, 11:23:56 am »
I'm no photographer, but I'd not call that a "modest focus issue"   :o

But I like the art work.

Robert

Offline Frank v B

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  • Started Flying RC: 1989
Re: Frank's EP Supersportster re-build
« Reply #8 on: November 10, 2018, 10:38:31 pm »
Making the cowl out of balsa.

- took the 1/16" plywood ring made in the earlier Mickey Mouse photos and made registration pins.  Drilled 3 holes through the ring and inserted dowels.  Then glued balsa onto them and tri-stock in side the corners.
- held the cowl onto the fuselage and planed the cowl to a rough shape with a razor plane
- did some hand-sanding.

Next step- fill the gaps in the firewall and the joint between the firewall and the cowl.  Will fill this with balsa filler.  To make sure the filler doesn't stick the cowl to the fuselage, I have inserted a sheet of waxed paper.  See last photo.
"Never trade luck for skill"