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Old Jan 15, 2003, 10:42 AM
Designer/Builder
Jim Young's Avatar
Brighton, MI USA
Joined Jun 2000
1,790 Posts
DH-88 Comet Plans

Inspired by the EAM ARF DH-88 Comet, I thought some of you builders out there might be interested in a built up Comet. I talked with Keith Shaw at the November EFO meeting and got some input from him and have been playing around with this design.

Here's the specs:

Wing Span : 50"
Length: 36"
Wing Area: 300 squares
Airfoil: Clark-Y
Power: 2 x SP400 on 8 cells (800mAhr or CP1300)

I drew it from a set of 3-views and enlarged the wing tip to 150% of the scale size. It will have ~3 degrees of washout to tame tip stalls. Construction is basic 1/16" balsa and some ply. The wing will be fully sheeted with 1/8" spar/sheer web.

-Jim Young
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Old Jan 15, 2003, 10:47 AM
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Jim Young's Avatar
Brighton, MI USA
Joined Jun 2000
1,790 Posts
Fuse plans....
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Old Jan 15, 2003, 10:47 AM
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Jim Young's Avatar
Brighton, MI USA
Joined Jun 2000
1,790 Posts
Wing plan...
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Old Jan 15, 2003, 11:57 AM
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Herb's Avatar
Irvine, Calif USA
Joined Feb 1999
12,165 Posts
Very nice Jim! The microsport was my first rc plane, what a handful ...
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Old Jan 17, 2003, 08:49 AM
Designer/Builder
Jim Young's Avatar
Brighton, MI USA
Joined Jun 2000
1,790 Posts
Herb,

Do you still have your Microsport? I went through 3 of them before I figured out that I had a cracked cap in my receiver. I'd get half way into a flight and then no control, snap, spin, crash. The post mortum would alway show no problem with the radio. Once I figured out the radio, it was a real blast. It's definitely not a beginners plane, and neither will this Comet. See the "Lunch with Keith" column this month.

-Jim
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Old Jan 18, 2003, 12:59 PM
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Herb's Avatar
Irvine, Calif USA
Joined Feb 1999
12,165 Posts
Jim, No I don't have the Microsport any more , can you imagine what it was like as the first rc plane ever (never flown rc gas in my life)? Too bad I did not take a picture of mine... But I did get it to fly and I learned a few lessons from it, the first one was that I should learn to fly first on a $20 foam slope plane...

Believe it or not I have been toying with the idea of building another one... Here's the link by the way for others to look at Jim's Microsport:

http://members.aol.com/KMyersEFO/microspt.htm
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Last edited by Herb; Nov 20, 2003 at 01:08 PM.
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Old Nov 06, 2003, 11:32 AM
Designer/Builder
Jim Young's Avatar
Brighton, MI USA
Joined Jun 2000
1,790 Posts
Laser cut parts

Hi,

Well the Comet went through a lot of revisions on paper this Summer. Many thanks to Keith Shaw for his input. The results I think will build into a light, nice flying model. I have had several "short kits" laser cut and I am in the middle of building the prototype. The prototype hasn't flown yet, but I thought I'd start posting some construction pictures.

Here are the laser cut parts. Basically you get the wing ribs, spars, fuse formers, and tail feathers. This takes care of most of the tough stuff.

-Jim
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Last edited by Jim Young; Nov 06, 2003 at 11:34 AM.
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Old Nov 06, 2003, 11:41 AM
Designer/Builder
Jim Young's Avatar
Brighton, MI USA
Joined Jun 2000
1,790 Posts
Wing Construction

The wing is fully sheeted and uses an 1/8" full depth balsa spar. All ribs are 1/16" balsa and there is an 1/8" sq. balsa rear spar.

I'm using an aluminum tube with music wire epoxied into the ends for aileron torque rods. With this set up I can use one servo and keep the control hookup simple. The holes for the tubes were laser cut into the ribs and it just slid in with no trimming necessary!

Here is the wing before the top sheeting is applied:

-Jim
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Old Nov 06, 2003, 01:32 PM
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hemna's Avatar
Cool, CA
Joined Feb 2003
415 Posts
nice looking kit. A friend of mine and I were going to build a couple DH-88's over the winter. really kewl planes. I love planes of that era.
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Old Nov 07, 2003, 11:19 AM
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Jim Young's Avatar
Brighton, MI USA
Joined Jun 2000
1,790 Posts
More Wing pictures

Here, one half is done and the second half is being built on to the first. Two 1/64" ply joiners connect the two halfs.

-Jim
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Old Nov 07, 2003, 11:22 AM
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Jim Young's Avatar
Brighton, MI USA
Joined Jun 2000
1,790 Posts
Tail feathers

The tail is pretty simple, just 1/8" sheet.
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Old Nov 08, 2003, 01:06 PM
What was that???
Gravitysux's Avatar
Colorado
Joined Oct 2002
72 Posts
Hi Jim!
So is this something you intend to offer as a kit? I'd be interested if you are!

Ray
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Old Nov 10, 2003, 02:42 PM
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Jim Young's Avatar
Brighton, MI USA
Joined Jun 2000
1,790 Posts
kit

Hi Ray,

I hope to offer a short kit in the future. I've been keeping this one close to my vest because it hasn't flown yet. Once I get the prototype flying, I'm looking at a construction article and some kits.

-Jim

More pictures...
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Old Nov 20, 2003, 11:14 AM
Designer/Builder
Jim Young's Avatar
Brighton, MI USA
Joined Jun 2000
1,790 Posts
More pictures...

Here the fuse is basically done and the tail and turtle deck sheeting are in place.

-Jim
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Old Nov 20, 2003, 01:03 PM
What was that???
Gravitysux's Avatar
Colorado
Joined Oct 2002
72 Posts
Looking good Jim!

Go ahead, try my patience! Actually I have enough projects for now but that won't last!

Ray
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