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Mick Reeves Gangster 63 Lite

First RC kit build - for classic pattern aerobatics

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Jonathan M05/09/2020 23:44:32
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814 forum posts
316 photos

One question for the gallery before I sign-off the nose/tank area (which will of course all be fuel-proofed with finishing-resin before final sheeting over):

The cutout in the second former behind the bulkhead is the perfect size to fit the supplied fuel tank, but this doesn't allow for swaddling the tank in foam to help prevent the fuel frothing from transferred vibration. What should I do? Keep it as it is with the tank suspended snugly by the former at the back end and the silicone-sealed neck at the engine bulkhead - or, to allow encasing it in foam, enlarge the former cutout and position the tank slightly further back with just the fuel lines etc protruding?

question

Jon

cymaz06/09/2020 10:18:38
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9317 forum posts
1211 photos

I would embed in foam and hot glue some to the face of the tank.

Andy Stephenson06/09/2020 10:33:19
214 forum posts
29 photos

Jonathan,

It's interesting to see how others tackle the same project. I found the trick of getting the fuel tank pipes past the nose-leg wire was to back off the tank by fitting the inner of an insulating tape reel as a spacer. The hole in F1 was made bigger and it was glued in. The bung of the tank fitted perfectly into the spacer. This pushed the tank far enough back whilst still holding it securely as to allow enough clearance to get the silicone pipes to get past the nose-leg. I still had to splay the brass tubes from the tank slightly. I fitted a larger tank than suggested so I had to enlarge the hole in F2 to get it to fit so there wasn't room for padding which, in any case, doesn't seem necessary.

I originally mounted standard size tail servos at the back of the fuz but when I came to check the CoG is seemed too tail heavy so I changed them to mini servos. Now having flown it I am going to put the standard size ones back in one at a time as I now think it's a bit nose heavy.

Andy.

Jonathan M06/09/2020 11:09:33
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814 forum posts
316 photos

Thanks guys. If I went down the foam route, rather than the 'hard' mount as existing, then:

(1) Surely encasing the whole tank won't be necessary - just where its supported at the bulkhead and the former at the back (with its cutout suitably enlarged)?

(2) The tank would have to be moved back a bit (else the copper pipes snug against the nose-leg would still transmit vibes) and have longer silicone pipes projecting through smaller holes (in a new piece of blanking ply) into the engine space.

With either option (hard or foam mount) I'd still like to be able to remove the tank for any future troubleshooting or repairs.

Andy - interesting how you fine-tuned things due to your bigger engine.  With my mid-weight Irvine 46 I'm mindful of keeping the CG back around 3.75" from the LE to start with.  At this stage I've already started making up solid 1/4" tails and will be adding more structure to the rear of the fuselage, and the battery and receiver will go as far back above the wing-mount bulkhead area as possible.

Edited By Jonathan M on 06/09/2020 11:16:26

Andy Stephenson06/09/2020 12:28:29
214 forum posts
29 photos

Jonathan,

I think you will find that the Irvine.46 is actually heavier than the .53 as they are based on the same castings. The .53 is bored out more to accommodate the larger displacement.

Andy.

PS

I just checked there's only 5g in it but the .53 is lighter.

Edited By Andy Stephenson on 06/09/2020 12:31:05

Nigel R07/09/2020 10:25:06
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4070 forum posts
694 photos

A loop of tape around the tank makes a reasonable handle to pull the tank backward out through a wing saddle.

I'd encase the whole tank. Then push the whole lot into place in one go. As cymaz say, hot glue some foam to the tank.

Personally I like SLEC maxi tanks. They make good use of space, are shorter than a standard bottle & bung type tank and the connection points are set back into the body of the tank a little, which can make routing the tubes a bit simpler. Plus, the flat front means the tape loop trick is easy.

Jonathan M07/09/2020 12:09:56
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814 forum posts
316 photos

Thanks Andy, and Nigel too - good to see you back on this thread!

Good tip re the pull-tape, and on the advisability of encasing the whole tank. I'll now go down the whole foam swaddling route, and move the tank back half an inch so only the tubing protrudes into the tank-bay. Will make up a slightly recessed cover to blank the enlarged neck hole in the bulkhead, then route the tubing through a new small, silicone-sealed hole clear of the nose-leg. I can see it now.

Cheers, Jon

Jonathan M16/09/2020 22:21:10
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814 forum posts
316 photos

Not much making progress to report in the last week, but today took the opportunity to run up the Irvine 46 with a11x6 prop on the bench and also an alternative suitable engine, the OS Max 46FX, with the same prop. The OS is being used in the Boomerang trainer but I wanted to compare the two power-plants: the OS pulled well topping out at 10,700rpm but the Irvine went the extra distance and really pulled getting up 11,800rpm! So sticking with this as my original choice for the Gangster.

Jonathan M16/09/2020 22:24:37
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814 forum posts
316 photos

PS: Re the fuel tank, given the very limited space and my wish to not increase the already large former opening so as to encase the supplied 12oz tank in foam, I've just ordered the 10oz version - should still have more than enough juice capacity for 12 minute flights, plus a couple of minutes reserve, which is more than enough.

Edited By Jonathan M on 16/09/2020 22:25:40

Nigel R17/09/2020 08:01:50
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4070 forum posts
694 photos

The Irvine silencer, does it have a baffle?

I found my predecessor OS - the SF - would do about 10k7 on an 11x6 APC, with the standard baffled silencer, but without the baffle it will turn at 11k5.

The baffle makes a reasonable difference to noise, predictably.

Jonathan M17/09/2020 08:06:07
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814 forum posts
316 photos

Good point, I don't know, will check the Irvine silencer. Its not the original and is an ill fit without a gasket as it leaks visibly.

Jonathan M18/09/2020 08:56:46
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814 forum posts
316 photos

The OS has a baffled silencer, the Irvine doesn't - hence as you helpfully point out the difference in top RPM.

We don't have noise restrictions at the field, but I'm inclined to order a baffled silencer for the Irvine from Just Engines.

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