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Old Feb 02, 2016, 03:45 PM
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RCM 1/2A Basic Trainer - Electric Conversion

I plan to build one of these from Outerzone plans

Looks like a nice design, 38" span should go well with electric power
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Last edited by victapilot; Feb 02, 2016 at 03:57 PM.
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Old Feb 02, 2016, 03:55 PM
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Wing

I'm making the wing with ailerons. Original plane has rudder/elevator only.

Instead of 2 large spars, I'm using three 1/8" x 1/8" spruce spars, one upper, 2 lower.

The leading edge is a 1/8"x1/8" spruce stick laid at 45 deg. I will sheet in between the front upper and lower spars to the leading edge to create D box structure. The back of the D is vertical 1/16" sheet balsa web.

This has worked well for me in the past to create a light and stable structure.

Ribs are 1/16" balsa. The plan calls for 3/32", but I find that I can use less with electric power
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Old Feb 02, 2016, 06:31 PM
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Looking good, vic.

Interesting about the leading edge. I've been working on a Guillows Piper Tomahawk (for years), and the leading edge was a 1/2" x 1/2" balsa stick. The instructions said to sand it into a LE....which I tried with not much success. Until I got one of these...man, if you're building balsa this thing is awesome. you can do larger or smaller diameter leading edges, and it has a V-shape in the center for control surfaces. Didn't take long at all, and the LE on the Tomahawk rocks.
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Old Feb 02, 2016, 06:52 PM
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i need to get one of those things!
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Old Feb 02, 2016, 08:57 PM
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Oh yeah, I highly recommend it. Not to be a shill for Great Planes, but check out these pics. The first shows roughly how much was removed....more than half the stick thereabouts. In the pic of the wing, you can see the seam from the flash, but it's very smooth...you can't feel it. And it doesn't take long to do it, and really not much stress...just let it do it's thing. You need a roll of sticky sandpaper to use with it, which can be pretty handy itself. You can put a strip on a piece of spruce or a dowel and reach into tight spots to sand.
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Old Feb 03, 2016, 06:43 AM
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Thanks for the tip! I have a couple of ply gadgets that were included in kits. Should be easy, I overlap the 1/8" spruce with 1/16" balsa sheet. Only the balsa gets sanded round.
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Old Feb 03, 2016, 08:24 AM
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Pics when ya get there....I wanna see how you do the LE.
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Old Feb 03, 2016, 09:45 AM
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My Buddy built one of these. A great flying plane.

Jim
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Old Feb 03, 2016, 10:43 AM
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Quote:
Originally Posted by whowhatwhere View Post
Pics when ya get there....I wanna see how you do the LE.
I'm waiting for the glue to dry on the left wing, so here's what I have.

The bottom part of the D needs to be added, I'll soak 1/16" balsa in water and pull it around using a lot of rubber bands. Using aliphatic Titebond 2.

Sanding gets out most of the imperfections, then light weight filler. Hey, that's what Monokote is for - hiding defects!!

The servo slot is installed, the wing is thick enough to mount the HXT900 servo upright. (when looking at the wing inverted )

The wing weighs 30g at this point, without the aileron.
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Old Feb 03, 2016, 12:14 PM
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That's a nice sanding gadget, could you tell me the product name?
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Old Feb 04, 2016, 11:10 AM
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Quote:
Originally Posted by High_Start View Post
That's a nice sanding gadget, could you tell me the product name?
Great Planes Contour Sander (11").

Searching for it on the web I see it offered as low as $8, with $2 shipping. But typically around $10 or so. You'll need a roll of sticky sandpaper, which as I said is pretty handy as well.
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Old Feb 04, 2016, 11:13 AM
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Quote:
Originally Posted by victapilot View Post
I'm waiting for the glue to dry on the left wing, so here's what I have.

The bottom part of the D needs to be added, I'll soak 1/16" balsa in water and pull it around using a lot of rubber bands. Using aliphatic Titebond 2.

Sanding gets out most of the imperfections, then light weight filler. Hey, that's what Monokote is for - hiding defects!!

The servo slot is installed, the wing is thick enough to mount the HXT900 servo upright. (when looking at the wing inverted )

The wing weighs 30g at this point, without the aileron.
Looking really good. I should've soaked some of my sheeting for the Tomahawk as you did, but a little late for that.

I still recommend the contour sander...you get *perfect* LE sanding results using it.
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Old Feb 04, 2016, 11:43 AM
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Ahh great, thanks a lot. Nice build by the way. Seems like a lot of people still know the art of balsa .
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Old Feb 07, 2016, 01:50 PM
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Both wings are assembled. Added some carbon tow to the bottom struts. Need to sheet the bottom LE and the center to 3rd rib
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Old Feb 08, 2016, 10:25 AM
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Looks awesome. I typically use a dremel to turn the triangular braces into gussets to reduce weight with no reduction in strength. I love gussets...they work really well and look *so* cool.
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