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Author Topic: The Next Step  (Read 1290 times)

Offline Tom Dugan

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The Next Step
« on: October 04, 2007, 07:37:44 PM »
I'm looking for all the advice I can get to complete my Pathfinder.  I have attached pictures so all can see where I am at.  I could easily cover the wings, prime, then paint.  But, Ive put a lot of time into this plane and want it to look as good as I can possibly make it.  I'm sure as I finish it I will make mistakes and have flaws in the finish.  These are issues that only time and experience will make better.  What I'm after is your recommended procedures/steps for a quality finish.  At this point do I use carbon fiber, cover the fuselage with silkspan, use sanding sealer, and etc.

I am not after a show finish.  I do want to make the most of completing this plane and learn all I possibly can.  You're probably thinking that there are lots of threads on finishing a plane.  It is true that there are and at the same time it is also the problem for someone with my level of building experience...Which method do I use...so many ways...so confusing.  I have impressed myself with what I've done so far.  It has been an exercise in patience but I'm committed to make a nice and presentable plane.  It would be nice if it flys well too.  With your experienced advice I can have it all.

Here is what Ive done so far.  The only change from the plans was to cut lightening holes in the fuse aft of the wing, then covered that section with 1/64th ply.  Other than that the plane is per plan.  As seen in the pictures it currently weighs 37oz with a proven Brodak 40 as planned power.  The tank is a 4.5 oz wedge uniflow on tounge muffler pressure.  Tom Morris 3" bellcrank with CF rod as push rods.  The flaps and elevator are taper sanded 1/4" at root to 1/8" on outer edge.  Since Ive used dope years ago, I would like to use dope with either a silk or polyspan covering.

Hopefully, this thread will serve other newbies as I hope it will me.

Thanks in advance....Thomas

Offline Tom Dugan

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Re: The Next Step
« Reply #1 on: October 04, 2007, 07:40:25 PM »
Additional photos

Offline Tom Dugan

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Re: The Next Step
« Reply #2 on: October 04, 2007, 07:43:31 PM »
One more

Offline John Miller

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Re: The Next Step
« Reply #3 on: October 04, 2007, 09:50:57 PM »
Lookin' good so far Tom.

May I suggest a few procedures.

I would do a lot more sanding before I started covering. Let's start with the stab first. We've had the best performance with Pathfinders when we airfoiled the stab. Blunt as you have it, will work, but may not have the groove we like to see.

The fuse looks like it could use some sanding, to soften up the angles.

So far, all the Pathfinders I've built from the kit, have balanced with no additional trim weight, or has needed some tail weight. I'll be interested to see how yours trims out. Using the method you have is a good one, and strong to boot though.

Whatever method you decide to use to cover, do it when you've finished the final sanding. Silk, Silkspan, or Polyspan are all good ways to cover for a paint finish. There are other methods, of course, but from your post, I suspect a painted finish is what you would most like.

If the wing and stab are not already glued in place,  I would cover them before installing them. In any case, even if they are glued into place, start with about 3 coats of thinned dope, wherever the covering will touch the frame work. Do the same to the fuselage. Cover the fuselage with medium silkspan, or silk. With the 3 coats of dope already on the framework, you can use thinned dope, about 60 to 70 percent thinner to attach the moistened silk or silkspan. Poly span is attached dry, and best used on the flying surfaces.

Some like to use Nitrate dope for the first stages of attaching and filling the covering. Others like to start with Butyrate from the beginning. I prefer the latter, as I like the protection from fuel leaks underr the covering.

No matter which way you go, remember this. Butyrate will go over Nitrate fine, but the other way around will cause so many problems, it makes my head ache.

From this point on, there are so many ways to go. You need to decide if you want an all dope finish, or an auto finish, or,,,,,

If your Pathfinder is straight, and it looks like it is, you'll like the way it flies. I think you're wise to not try a super finish. It might make you afraid to really fly the plane because you fell in love with the finish.

Best of luck.
Getting a line on life. AMA 1601

Offline Bill Little

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Re: The Next Step
« Reply #4 on: October 05, 2007, 05:27:03 PM »
Hi Tom,

Tell me when you want to bring it over, and we can go from there..............
Big Bear <><

Aberdeen, NC

James Hylton Motorsports/NASCAR/ARCA

AMA 95351 (got one of my old numbers back! ;D )

Trying to get by

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