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Author Topic: Davis DA-5A  (Read 874 times)
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bgrove
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« on: February 18, 2020, 07:20:22 PM »

I'm going to build this fun little peanut of the Davis DA-5A.

Wings already turned out nicely   Smiley
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bgrove
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« Reply #1 on: February 20, 2020, 02:11:00 PM »

Starting on the fuselage.
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bgrove
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« Reply #2 on: February 21, 2020, 03:38:16 PM »

Progress on the fuselage.  Nothing glued or squared up yet.
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bgrove
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« Reply #3 on: February 24, 2020, 07:19:52 PM »

I made some great progress this last weekend.  Ended up on a hunt for landing gear wire   Sad  stocked up once I found it.
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bgrove
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« Reply #4 on: February 24, 2020, 07:21:18 PM »

A couple more shots.  I like my new way of attaching the detachable nose piece.
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OZPAF
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« Reply #5 on: February 24, 2020, 09:36:05 PM »

Do you sleep Brian? Fast progress and it looks interesting - although a lot simpler than your F1 racers.

Happy building
John
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bgrove
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« Reply #6 on: February 25, 2020, 02:49:14 PM »

John, I get to build for about 1 - 1.5 hours a night after work before dinner.  That is when we have nothing else planned.

I like this simple build.  It's like a building 'sorbet'.

I got the front of the fuselage looking better and now I'm working on the canopy top.

I still have to figure out how to attach the V-Tail.  The plans are light on detail there.

Brad
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bgrove
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« Reply #7 on: March 02, 2020, 04:50:56 PM »

It's almost time to start covering  Smiley  This weekend, I found some Isaki in my supply of colors I like.

I finally figured out the V-tail.  I will cover it separately before attaching it.  The same is true for the canopy top.  I also am planning to use a previously turned spinner I never used.  I can't find a picture of this plane with matching spinners, so this should be just fine.

Brad
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bgrove
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« Reply #8 on: March 05, 2020, 02:56:02 PM »

I made good progress the last couple of days - thanks to the Corona virus!!  I got a cold - little cough and sniffles, so I need to work from home  Smiley  which also gives me time to break away and do a bit of building.

I started to cover the plane.  Got some advice last night from my son who has artistic ability and I liked his suggestions.  I'm home again today, so more progress soon.

Brad
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rgroener
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« Reply #9 on: March 10, 2020, 02:46:47 AM »

Brad, thats a neat little plane. A DA-5 was on the cover of the Kitplane magazine some time ago. I was wondering how to trim a plane with a V-tail... never tried it. I will follow your build to see how it is done.

Roman
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THB
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« Reply #10 on: March 10, 2020, 05:30:25 AM »

Nice build - I have built a couple of DA-2As with v-tails - they trim out ok with some trial and error!
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Tim
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bgrove
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« Reply #11 on: March 10, 2020, 12:22:24 PM »

I have this plane almost completed  Smiley

Covering completed with only minor wrinkles here and there.  Two coats of Eze Dope at about 20 to 1 (water/dope).  I then applied the stripes with UHU blue glue stick, then one coat of 20:1 EZE dope.

I cut and attached the canopy last night and continued to adjust my spinner mount.  I was waiting to attach the wings until I had the canopy attached.  I thought it would be easier to attach the canopy without having to work around the wings - and it was much easier.  So up next is mounting the wings, wheels and attaching the spinner.

Brad

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OZPAF
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« Reply #12 on: March 11, 2020, 12:30:49 AM »

Very colourful Brad! Do you know how much it weighs?

John
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rgroener
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« Reply #13 on: March 11, 2020, 09:55:17 AM »

Nice snout, I like the last picture. Nice colours too...
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« Reply #14 on: March 11, 2020, 03:52:56 PM »

Re: Trimming a V-tail model

I built this peanut TX-Air TX-1 from Larry Kruse plans.  Trimming was straightforward.  After establishing a starting CG, the v-tail unit was tack glued to the fuselage at the leading edge and shims added under the trailing edge to set the glide trim. 

The v-tail was built and covered as a separate unit, and as long as everything is free of warps and not glued to the fuselage askew, trimming should not be a big deal.

Best,

Scot Dobberfuhl
Forest Grove, OR
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bgrove
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« Reply #15 on: March 12, 2020, 01:46:03 PM »

I attached the wings and back wheels last night.  It is tail heavy.  I'm thinking I can sneak some lead weight into the front chin air intake to hide it.  The CG is not shown on the plans, so I'll have to play this that.  Current weight is ~ 25grams.

Just a few more details and it will be done.

Thanks for the trimming tips Scot.  Of course I've already glued the tail on   Angry  But I can always cut that lose for adjustments.

Question:  does anyone have a good technique for doping thin tail surfaces and not having the two side stick together in the middle?  Can you dope only one side at a time and not warp the structure?  I find I have to use a pin to snag and lift the tissue to separate the top/bottom.

Brad
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TheLurker
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« Reply #16 on: March 13, 2020, 03:16:19 AM »

Quote from: bgrove
Question:  does anyone have a good technique for doping thin tail surfaces and not having the two side stick together in the middle?
Hmm.  A technique, I refuse to categorise it as good, which I use for EzeDoped tails is to do one side and rest it on supports with the doped side down until the slack is taken up a bit.  When a good deal of the slack has been taken up but before* it tightens up completely do the other side and then pin to the board with the second side facing down.  If you're using EzeDope the stand-offs need to be a minimum of 1/8" because the tissue can go really baggy.  Holding the tail so that the tissue is vertical when you apply the dope also seems to minimize the tendency of the surfaces to stick together.   I have never tried this with "grown-up" dope but I'd think you'd stand a reasonable chance of it working.



*This is why I wouldn't describe the technique as "good".  It requires a measure of judgement rather than being a simple "Do a, b then c." procedure and sometimes you'll still stuff it up and have to start again.
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Jack Plane
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« Reply #17 on: March 13, 2020, 07:26:59 AM »

Perhaps just let the first side dry/tighten a bit (rather than pin it down unnecessarily), then brush the dope onto the second side using only very light tangential strokes?
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bgrove
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« Reply #18 on: March 13, 2020, 05:10:07 PM »

Thank you for the ideas.  I will definitely give doping one side, let it tighten up, then the other a try.

The Davis DA-5A is done!!  Final weight after balancing is 27 grams.   

I finalized mounting the wheel retainers. Applied the 'step area' on the wing and applied the experimental stickers.  I might add exhaust stacks, or not and just move on.

I wonder what will catch my interest for my next build??

Brad
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RolandD6
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« Reply #19 on: March 13, 2020, 05:32:45 PM »

A nice colour scheme and a neat covering job. Well done.

Paul
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bgrove
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« Reply #20 on: March 13, 2020, 07:42:38 PM »

Thank you Paul  Smiley

Quick question.  What are those 'rods' on the tops of the V-Tail and what is their purpose?

I think they look cool, but there has to be a reason.

Brad
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Indoorflyer
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« Reply #21 on: March 13, 2020, 10:40:32 PM »

They are mass balances on the flying tail surfaces.  The longer rods extended forward, allow smaller weights to be used
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OZPAF
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« Reply #22 on: March 15, 2020, 11:17:35 PM »

I agree with Paul Brad. You are raising your standard with each build.

John
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