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F86 "Gamma" Build

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John H. Rood25/09/2019 02:33:40
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215 forum posts
313 photos

About that Titebond “Quick & Thick”: The fine print says it is NOT for structural applications.

Phil Beard25/09/2019 10:38:53
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50 forum posts
67 photos

John,

Try Deluxe Materials Genuine Aliphatic Resin, I've been using that for building balsa models for years now.

All the Best

Phil Beard

Bob Jennings 104/10/2019 10:11:40
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148 forum posts
242 photos

Bringing any more kits to the Orme next weekend? Bought my additional wood in readiness!

Martin Gay04/10/2019 10:25:48
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198 forum posts
220 photos

I plan to deliver a number of kits to the Orme and hope to have a couple of spare ones - just in case!

Bob Jennings 104/10/2019 11:17:04
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148 forum posts
242 photos

Must clear the Nimrod off the bench first though!

Edited By Bob Jennings 1 on 04/10/2019 11:17:40

Martin Gay04/10/2019 13:03:25
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198 forum posts
220 photos

You still have a week to finish it!

Peter Garsden06/10/2019 20:22:58
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1605 forum posts
1184 photos

Just checking you are bringing plans Mark 2 to the correct scale Martin?

I am deep in Jet Provost land at the moment. I am not sure the jets I am making out of balsa will propel it to twice the speed of sound. I have so much scrap wood, I could probably install a log burner.

If anyone wants some left over 3/8, I can bring my spares with me to the Orme if anyone wants it?

Martin Gay06/10/2019 20:51:09
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198 forum posts
220 photos

Hi Pete,

I will be bringing plans to replace the undersized version 15 plans for all those that have requested them to be delivered to the Orme.

For those that will not be attending the replacements will be in the post this week.

Martin.

Martin Gay09/10/2019 10:59:48
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198 forum posts
220 photos

All,

During the Gamma build, it was noticed that the plan shows the tailplanes are made from 2 laminations of 1/8" balsa sheet.

THIS IS INCORRECT! it should be from two laminations of 1/4" as per the cross section.

Martin

Andy Blackburn13/10/2019 15:15:43
509 forum posts
487 photos
1 articles

Martin - in order to save the rest of us doing some experimentation, can you please tell us a) how wide your planks were (10mm?) and b) whether you'd use different width planks if you built another one?

Edited By Andy Blackburn on 13/10/2019 15:16:09

Martin Gay13/10/2019 17:07:54
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198 forum posts
220 photos

Hi Andy,

I cut all my planks to 1/4" wide for both Sabres which seemed to work well.

Martin.

Phil Beard13/10/2019 18:20:10
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50 forum posts
67 photos

Martin,

I bought some 48 inch long sheeting on advice from the group so that I can go from end to end, I take it the 1/4 inch planking still works for that also.

All the Best

Phil Beard

Martin Gay13/10/2019 20:04:11
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198 forum posts
220 photos

Phil,

The Gamma build used 48" long balsa cut to 1/4" wide strips. It was easier, and looked neater, than the shorter planks on the prototype model.

Edited By Martin Gay on 13/10/2019 20:04:33

Austin Massey17/10/2019 22:51:44
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1 forum posts
1 photos

Hi Martin, thanks for the build info. I would still be sat staring at the plans without it. My method of keeping the jig true and steady is to glue it to a piece of worktop. This frees up my building board for the fuselage (a bit of multi-tasking coming up). I've started early because I'm an old Duffer who takes his time. I've shaped the wing skins and marked them up. Time to start gluing.

I tried to add a photo but failed..... so much to learn...

Austin

Peter Garsden18/10/2019 09:09:49
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1605 forum posts
1184 photos

I've just been musing about planking (note the spelling), and have realised that in reality I am due another lost foam fibreglass fuselage, but it is too late now as I have bought the kit of parts, so if anyone wants a kit of parts, I am prepared to have a crack at it. Let me know. You can have it for the same cost as I paid, less the cost of the plan which I think is £10 which obviously I need. I think this really lends itself to a fibreglass fuselage.

Actually delete that as I realise I need the parts for the wing, so will have to keep thinking..hmmm.... will see how many parts I will be wasting - actually I can use the formers for inside the fuselage instead - brilliant...yes..hmm..(can hear cogs whirring...)..yes indeed, I think we have a plan Holmes....

Edited By Peter Garsden on 18/10/2019 09:12:40

Martin Gay18/10/2019 10:54:08
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198 forum posts
220 photos

Hi Pete,

You could frame up the fuselage sides and then add foam blocks. These could be hollowed out from the inside and fibreglassed on the outside.

Once cured, melt the remaining foam out.

I look forward to hearing how it all goes but don't forget the model was designed to use a 3mm balsa skin.

Peter Garsden22/10/2019 20:21:06
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1605 forum posts
1184 photos

Thanks Martin, having done this before a few times, I think that this will only work as a true lost foam fuselage. I will cut out the foam from top and bottom and left and right with a hot wire then sand it to shape. I won't need all the formers, probably just front and back. One has to put the formers in from inside out which is difficult, but in reality, with fibreglass they are not really needed as the structure is itself strong enough. I will use carbon and kevlar to strengthen high stressed areas.

You will see what I mean when I start my blog. I am sure I have seen fibreglass fuselage versions of the Sabre before,and it will be as strong as a brick ****house

Martin Gay22/10/2019 21:51:41
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198 forum posts
220 photos

If you are going that route Peter, are you going to take an extra mould of the back ends and use them to make the speed brakes? wink 2

Peter Garsden23/10/2019 20:45:37
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1605 forum posts
1184 photos

Speed brakes.....mm....looked at them and have no idea how I would operate them. Will think about it.

Flyer23/10/2019 21:17:24
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552 forum posts
82 photos
Posted by Peter Garsden on 23/10/2019 20:45:37:

Speed brakes.....mm....looked at them and have no idea how I would operate them. Will think about it.

Trying to work on that at the moment Peter; watch this space!

Ade

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