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First generation acrowot tail fin

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Morgs21/01/2020 17:44:36
19 forum posts
5 photos

Hi all can anyone help me, I've completely snapped off my tail fin on my acrowot there is no damage to fin but where the fuselage tappers down to fin needs replacing both sides. So need plenty of advice from the experts please on the best way to repair it please.

Ronaldo21/01/2020 18:05:16
253 forum posts
17 photos

Would be helpful if you could post a photo of the damage Mark.

bert baker21/01/2020 18:26:24
1580 forum posts
324 photos

Clean it up as best as possibly and glue it back on

kc21/01/2020 19:30:29
6419 forum posts
173 photos

Presumably this is the kit built 57 inch balsa version? Those of us canny enough always draw around every component in the kit onto a bit of lining or wallpaper before starting construction. Then every component can be made again or even a complete model. So someone will have every component drawing for this popular model. But just gluing the remains back together with some slight reinforcemment may work well enough.

At the top of this page you will find 'Features' then' Building technique ' then Don't Bin it Fix it' which is Peter Millers guide to fixing broken models. This covers reinforcing the broken parts.

Bruce Collinson21/01/2020 19:35:02
511 forum posts

Keep it light.


Morgs21/01/2020 23:04:20
19 forum posts
5 photos

Thanks for your responses tried to upload photos but can't work it out, fin is complete just needs gluing back on and a repair to one side of the rear fuselage.

Morgs21/01/2020 23:13:44
19 forum posts
5 photos

Thanks kc found the Peter Miller guide I'm on it yes

Morgs22/01/2020 07:58:54
19 forum posts
5 photos

20200121_181503.jpg20200121_181456.jpgfinally worked out how to upload pics lol, would thick ca sort it.

Jon - Laser Engines22/01/2020 08:17:18
5418 forum posts
263 photos

I would probably glue it straight back on with some epoxy and then sort out the missing parts after that.

Peter Miller22/01/2020 08:19:17
10948 forum posts
1272 photos
10 articles

You can use thick CA but I would reccomend Aliphatic resin glue. THis is more gap filling. IT is also much harder that PVA when set

I would also get some1/4 (6mm) dowel and insert a couple of pegs in the base of the fin and drill matching holes in the tailplane.

This would add reinforcement in the event of a future tumble.

David Davis22/01/2020 08:23:24
3680 forum posts
688 photos

I agree with Jon. Glue it back in place with epoxy then find some light balsa block, cut it roughly to size, glue the block into position and shape it to the fuselage contours. The covering looks like Cub Yellow to me.

Nigel R22/01/2020 09:29:26
3737 forum posts
585 photos

I would use epoxy to stick the fin on. Then some soft block to fill the missing area on the one side of the fuselage.

Morgs22/01/2020 10:47:58
19 forum posts
5 photos

Thanks everyone.

alex nicol22/01/2020 10:55:11
359 forum posts
15 photos

Agree with above, epoxy the fin back on and make sure it is straight. If you have the other broken bits glue them back in and it'll be fine. Alternately if you don't have the broken bits make a rectangular block from some very soft 1/2inch balsa sheet, carve and sand it to fit and you'll be good to go. (speak to clubmates somebody will more than likely have a bit of scrap balsa that'll do the job and should be able to give you a steer)

kc22/01/2020 11:10:03
6419 forum posts
173 photos

I see that in the original Acrowot instructions there should be a hinge on the rudder very near to and slightly above the rudder horn. There seems to be no sign of it in your photo. Make sure you replace this hinge - perhaps choosing a nearby alternative position to avoid digging out the old hinge if it ever existed.  No sign of it being pinned unlike the other hinges which are clearly pinned.

Edited By kc on 22/01/2020 11:12:02

Martin Harris22/01/2020 11:25:34
9262 forum posts
245 photos

Don't forget to re-check the C of G before flying - additional weight added while repairing/modifying at the tail can shift the C of G significantly.

Morgs22/01/2020 13:22:52
19 forum posts
5 photos

thanks all, where is the C & G on the Acrowot.

kc22/01/2020 13:33:01
6419 forum posts
173 photos

These sort of repairs are so much easier if you collect all the bits of balsa .......with the missing bit it will just glue in and look almost like new. Without it's quite a lot more work. Easier to look around for the missing curved bit!

Without the hinge by the rudder horn any blow to the rudder or even using the rudder in the air will tend to pull the fin to one side. With a hinge in the fuselage itself it will help a lot.

Cof G in the origiinal 57 inch is shown as three and a quarter inch back -plus or minus one quarter inch- measured from bulkhead ( dowel hole bit)   Thats 82.55mm plus/minus 6.35mm I think.  


Edited By kc on 22/01/2020 13:43:48

Morgs22/01/2020 13:55:32
19 forum posts
5 photos

20200122_134950.jpg20200122_134858.jpgWill put in that hinge when I repair it, also got missing piece but some of it missing.20200122_134909.jpg

Bob Cotsford22/01/2020 16:20:55
8389 forum posts
463 photos

that will glue back together easily enough, then a dash of filler before patching the covering if you want it to look posh. As kc said, it really does need that missing bottom hinge fitting.

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