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F86 "Gamma" Build

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robk28/12/2019 20:04:03
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120 forum posts
167 photos

Thanks Martin and Andy. My pal Graham has sent me an interesting image reproduced here which clarifies this issue. The Sabre had ailerons that reached the tips and ones that didn't, depending on the variant. My chosen aircraft is 86F entering service in October 1953. The 86F had both aileron configurations so it could have been either Im going with what I have built and what is on the plan and what works best for a slope soarer. Phew!.

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robk29/12/2019 22:36:14
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120 forum posts
167 photos

By the way Martin - I cant see a hatch. How do you fit and turn off and on your flight battery?

Martin Gay29/12/2019 23:37:42
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385 forum posts
254 photos

I use a magnetic switch. Connect the battery then fit the wing. Use the mag switch between flights and disconnect the battery at the end of the day when the wing is removed!

robk30/12/2019 18:32:37
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120 forum posts
167 photos

Thanks Martin - I hadnt heard about those until now! Inspired by your solution I have figured out a way to do it without the hatch so watch this space.

Peter Garsden30/12/2019 19:46:27
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1723 forum posts
1297 photos

I am a big magnetic switch fan having crashed both my Hawk and JP with scale type switches operated with wire. You can get them from either T9 Hobbysport **LINK** or Pico Switches **LINK**

Martin Gay03/01/2020 18:59:52
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385 forum posts
254 photos

"Gamma" build is now complete - awaiting the maiden flight!

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Martin Gay03/01/2020 19:01:23
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385 forum posts
254 photos

More photos:

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Martin Gay03/01/2020 19:03:11
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385 forum posts
254 photos

Undersides showing the "hidden" linkages on the "Gamma" build compared to the prototype where the linkages hang out in the breeze!

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robk03/01/2020 19:29:06
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120 forum posts
167 photos

Looks great Martin - those hidden linkages are excellent.

Edited By robk on 03/01/2020 19:29:22

Martin Gay03/01/2020 19:38:06
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385 forum posts
254 photos

Close up of the top hinged/bottom actuated aileron linkage:

20200103_193401.jpg

Edited By Martin Gay on 03/01/2020 19:39:19

Martin Gay03/01/2020 19:40:24
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385 forum posts
254 photos

Bottom hinged/top actuated flap linkage:

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Phil Cooke03/01/2020 19:58:48
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2546 forum posts
1795 photos

Excellent stuff guys, the finished Gamma Build looks superb! Do you have an AUW for comparison to the prototype?

Martin Gay03/01/2020 20:25:00
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385 forum posts
254 photos

It weighs in about 3.5lbs which is 8 ounces lighter than the prototype!

John H. Rood04/01/2020 16:29:09
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268 forum posts
387 photos

Fantastic job! These are truly great days in PSS model design and construction.

p.s. Gotta love that shade of yellow... so reminiscent of the great old primer applied to aircraft structures back in the right and proper days. BUT I DIGRESS!

smile

Peter Garsden03/04/2020 15:56:57
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1723 forum posts
1297 photos

Martin, did I read correctly that on the Gamma Build you altered the Centre of Gravity from 168mm behind the leading edge to 172mm? I am at the stage of balancing. I think you said that this C of G suited your style of flying better?

Martin Gay03/04/2020 23:23:21
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385 forum posts
254 photos

Peter,

Yes. I moved the CG back as ypu mentioned. When I measured the tailplane/wing incidence angle I found it to be 0:0 as best I could measure.

This gave a me a much better feel on the sticks, but I like a more neutral feel to my models.

You can always move the CG forward for the maiden flight!

Peter Garsden04/04/2020 19:01:51
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1723 forum posts
1297 photos

Thanks Martin. As you can see from my blog, I am finished and ready to maiden. It has turned out, however a tad heavy at 4.5lbs. Just trying to work out the wing loading, so what is the wing surface area please for calculation purposes. I note that mine is 8oz heavier than the prototype. It will however fly faster in a high wind (he said??)

Edited By Peter Garsden on 04/04/2020 19:02:24

Martyn K19/04/2020 15:27:07
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5078 forum posts
3678 photos

Hi Martin

Can you drop me an email please, I have lost your email address

M@czd.org.uk

Thanks

Martyn

Dallas Crisp23/04/2020 00:36:47
8 forum posts

Hi Martin

Your building blog has been of great help, however I am in need of a little advice. As my F-86 will soon be ready for covering I have decided to go with glass cloth, could you please tell me the date of the RCM&E that contained that article. Also I have never used or heard of a magnetic switch, Peter has given a link for these so I will give one a go. Any advice on using or installing one, would be appreciated. I believe that you have set up your F-86 with 0 incidence on your wing and tailplane, have you been able to test fly your plane with these settings?

Looking forward to joining in on one of your PSS events next year, will hopefully bring along my F-86. Thank you for your advice and time, Dallas Crisp Brisbane Australia.

Martin Gay23/04/2020 09:04:17
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385 forum posts
254 photos

Hi Dallas,

I'm glad the blog was of some help.

To answer your questions:

There was an article on how to fibreglass in the 2019 Special Edition of RCM&E - this is the most recent one. If you have any questions about the various techniques please feel free to ask as there is a wealth of experience on this site. However, you will get lots of apparently contradictory answers, as we all have our own methods. For instance, I prefer to fill the weave of the cloth with "diamond hard" varnish whilst others add another layer of resin!

On the prototype, and Gamma build Sabres, I have used this magnetic switch from Hyperflight:

**LINK**

I have hot glued it to the inside of the fuselage and connect it up before fitting the wing. When I remove the wing again I disconnect it as it will slowly drain the rx battery if left connected - please don't ask how I know!

The wing/tail incidence was measured after I had got the model flying just the way I liked. Being all an moving tail made life very easy with respect to trimming. The CG on the plan makes the model safe to fly, but slightly nose heavy for my preferred flying style which is why I moved it back to 172mm from the back of F4. It could go back a bit more, but I recommend starting at the plan position.

We all look forward to seeing you at one of the PSS events in UK. If you cannot bring a model with you, don't worry as I will be happy to set up the buddy box - I have both Mode 1 and Mode 2 available.

Martin.

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