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RCM&E at 60: Kakadu, the first free plan

Plan from vol. 1, issue 1, p47

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RCM&E 60th Anniversary Fly-in 2020

RCM&E 60th Anniversary Fly-in 2020

Put 12th 13th Sept in your diary!

Dad_flyer17/05/2020 21:35:05
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286 forum posts
309 photos

Is all piano wire supposed to bend, or is some tempered differently? I have a piece of 16SWG which I have tried to use for two different things. Both required bends all the way back on itself. It is very stiff to start bending and then broke. Another piece of 16SWG was fine.

This is the second item to bend, the tail skid.

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And trial fit

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It is probably more weight than necessary for a skid, and at the wrong end of the model. I shall not glue it in before I have tested the balance.

Bob Cotsford18/05/2020 09:58:20
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8393 forum posts
463 photos

I've got some threaded pushrods which are particularly brittle and are impossible to bend, which makes them pretty much useless as pushrods. Sometimes the wire we can get does seem to have too much temper but more often it's like overcooked noodles. When I were a lad piano wire that we got seemed more predictable smile d

Dad_flyer18/05/2020 13:18:52
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286 forum posts
309 photos

So I need to sort the piano wire like selecting balsa soft, medium , hard cheeky.

Dad_flyer22/05/2020 08:47:34
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286 forum posts
309 photos

Got round to putting the fairing back on for the tail last night.

Infill in the base first.

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Dad_flyer23/05/2020 16:18:00
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286 forum posts
309 photos

Time for the firewall. My slow Epoxy tubes are rather empty, so I did it by weight. Looking very picturesque.

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Dad_flyer23/05/2020 18:59:52
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286 forum posts
309 photos

The firewall and side pieces as above.

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And glued in place.

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Dwain Dibley.23/05/2020 22:12:54
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1410 forum posts
1405 photos

Hello D.F.

Just read thru and thoroughly enjoyed your build. Very neat work and some nice subtle changes too.

If you don't want a heavy tail skid, just make 1/8th ply one.

Keep up the good work.

D.D.

Dad_flyer23/05/2020 22:22:40
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286 forum posts
309 photos

Thanks DD. I have been following your Mr Mulligan. I am so much slower on this build than you are! I need to crack on to get it finished in anniversary May.

I did a quick balance check with motor but no battery and it was nose heavy, I think that was with the skid in. Anyway the battery servo etc are all in front of CG. We shall see what happens with covered wings.

Dad_flyer24/05/2020 17:32:19
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286 forum posts
309 photos

With the motor fitted, a piece of cardboard fitted for the hole in the cowl.

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A circle on a curved plane makes an oval.

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Then transfer this to the formed balsa cowl.

img_20200524_171626101~2.jpg

Who can spot the mistake? blush crying blush

Dad_flyer24/05/2020 17:52:25
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286 forum posts
309 photos

Whilst you ponder my embarrassing error, I have also tested the power. E-calc said that this motor (1000kv) on 2s (mid charge) with a 9x6 should give 5900rpm at 55W and 440g thrust. AUW looks to be a little under 1lb, so that would be ok. Well below the motor rating, but it is a motor I had and ground clearance is only enough for a 9" prop. As long as the reality is not too far off this prediction...

I did not put the power meter on as it is all so far below battery, ESC and motor spec. Got 5900rpm on a storage charge battery, just as calculated, so that is good smiley.

Dad_flyer24/05/2020 22:17:52
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286 forum posts
309 photos

I put the card template outside the 1/8"thick cowl. It is a lot further round so the hole was too high up. That only meant that I had to make it longer by opening it out more at the bottom. It still looks OK.

img_20200524_180449395~2.jpg

Now to screw it on and trim the sides flush.

Dwain Dibley.24/05/2020 23:28:06
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1410 forum posts
1405 photos

I was looking for something really bad there, no wonder I didn't see..........LOL.

It was an easy fix and just a simple error, we have all done that.............more than once !!

Plus you can now get to the motor mount screws....wink

D.D.

Dad_flyer24/05/2020 23:41:24
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286 forum posts
309 photos

No not really bad. Just rather dumb laugh. I was surprised actually how much difference it made.

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