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Simon's Grumpy Tigercub

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Simon Feather21/02/2018 19:30:20
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242 forum posts
178 photos

I've been ill, it seems for ages, so I've not done anything much recently. Power pills from the doc have meant I'm now much better, so been having a look to see where I got to. Prolonged absence from my subterranean workshop seems to have introduced a wonderful S-bend into the trailing edge of my unfinished wing, so I've stripped and re-made the TE.

I've just started now on the ailerons and flaps; one disadvantage of making GT bigger is that the standard aileron stock that I had was completely the wrong size (not wide enough, but also a little too tall at the thick end), and in any case I want to try to save weight where I can, so I've made a start on built-up flaps and ailerons. 1/16" sheet top and bottom, and simple triangular ribs, should be lighter than the TE stock. So progress has resumed, but it's half term here this week so although I can do a bit tonight that is probably that now until Sunday!

Peter Miller22/02/2018 08:22:54
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11211 forum posts
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10 articles

Glad to see you back. It is a swine when one is laid low and can't work on onesmodel.

Simon Feather22/02/2018 09:44:41
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242 forum posts
178 photos

here we go, pics of the flaps under construction: using the same technique I used for the ailerons on my KF3 which worked well - control horns are shaped from glass fibre sheet sandwiched between two of the simple triangular ribs. Ailerons ditto.

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TE is tapered down so that when the top sheet goes on, it ends up just a fraction more than 1/16" thick.

Edited By Simon Feather on 22/02/2018 09:46:43

Simon Feather01/07/2020 18:20:55
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242 forum posts
178 photos

Well, wasn't it a long time ago I last posted on here...

I hit a snag with the fit of the nacelles to the wing, so the build stalled, and then... other priorities happened as they do.

The recent lockdown prompted me to get the GTC back on the bench again, and things have progressed. Not as quickly as I'd like, because I'm neither retired nor furloughed, and work has actually been busier, so time is limited. But some progress has been made as can be seen from the pictures below.

As a reminder, this is Peter's Grumpy Tiger Cub, but enlarged to 70" wingspan.

I have put aileron servos in the wings as I always do, and added flaps. Power is 2x OS 52 Surpass - I have acquired two new-in-box never seen fuel engines for this. What a treat to fire those up for running in! Both started on the first turn of the starter.

Ignition uses a Hobbyking glow starter in the central wing section (the type that fires up the plug for 15s after you press the button), with a three way switch to control which engine the electons get sent to. 500mAh 2s Lipo provides a huge number of starts on a charge!

Covering is a mix of Hobbyking and Easycoat. Not so impressed by the Easycoat personally, I found it too easy for the glue layer to delaminate from the film, and the glue is coloured and stains the wood. Markings are vinyl cut on a Silhoutte cutter, more to be added yet...

Not done the canopy yet - once I've test flown it, I'll make a plug and vacform one.

Engines are run in, hopefully doing engine matching and ground tests later this week or sometime next week and maiden.

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Edited By Simon Feather on 01/07/2020 18:21:13

Peter Miller01/07/2020 18:24:26
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11211 forum posts
1321 photos
10 articles

That is going to be very impressive

Simon Feather04/07/2020 17:33:48
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242 forum posts
178 photos

Two engines running.... Start of ground tests.. Sounds awesome!

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Ron Gray04/07/2020 17:43:47
2233 forum posts
978 photos

That is nice Simon, reminds me that I need to get building my one!

Levanter04/07/2020 18:11:52
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883 forum posts
437 photos

And me blush

Mine got stuck forming the second flap and when I found that I had made the nacelles so that I needed custom tanks or accept a very low capacity. Mine will run on 2 OS26 FS engines so probably I don't need much.

Because I live right next to a harbour and miles away from an airfield I have taken to building some boats. Also a flying boat to keep my hand in.

Very nice work Simon

Levanter

Edited By Levanter on 04/07/2020 18:12:40

Ron Gray04/07/2020 22:02:23
2233 forum posts
978 photos

I've redesigned Peter's excellent plans to allow for round cowls (baking tins) plus some other bits, but the plans, together with the 2 x ASP 30 FS engines are gathering dust at the moment! Shame on me.

Ace04/07/2020 22:11:05
324 forum posts
23 photos

Very nice Simon I do like a nice twin.

Like others I to have a half cut plan that needs finishing - embarrassed

Peter Miller05/07/2020 08:15:33
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11211 forum posts
1321 photos
10 articles

I shall look forward to seeing all these eventually

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