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Phil's F-86 Sabre build thread

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Phil Cooke17/02/2020 18:14:12
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2586 forum posts
1824 photos

Hi Andy

You dont need to add the elevator actuator at this stage, it drops into the grooves formed by the 2 halves coming together later... I'd have to re-read Martins blog but maybe he was talking about the snakes being fitted ahead of the joining?

Andrew Edmead17/02/2020 18:28:10
57 forum posts
50 photos

Below is From Martins blog.

Before joining the two fuselage halves, be sure to add the wing bolt plates and the assembled battery box, along with the tailplane bellcrank assembly. The rear slot for the actuating rod is not machined into F15 as not everyone will choose to use the SLEC item. Cut the rear slots into F15 to suit your bellcrank. Dry assemble the sides until you are happy with the fit.

Phil Cooke17/02/2020 18:34:39
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'If you have not yet planked the bottom of the fuselage, you can access the dowel holes in F4 with a short pencil or a small dowel with the end inked' - whoops! - I glued this sheeting on last night!

I was keen to see how much of the bottom fuselage could be sheeted as apposed to full planking...not too much is the answer! - the compound curvature of the nose meant i couldn't quite finish the job as expected - it was tight and needed a load of pins to get it to form as shown, even after a lick of ammonia softened it up a little...

lower sheet 1.jpg

I'll think I've still got to add 3 planks each side...

lower sheet 2.jpg

As an escape, I made up the tailplanes. I'm going to glue my tails on, so was keen to create some nice box channels for the steel rods to sit in (will be epoxied later) and this 3 way laminate approach guarantees accuracy. 3/16th, 1/8th, 3/16th balsa laminates.

tails 1.jpg

Martin Gay17/02/2020 20:44:07
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396 forum posts
255 photos

Phil,

I think you have enough access to still mark the dowel positions from in front of F4.

Martin.

Phil Cooke17/02/2020 21:14:24
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2586 forum posts
1824 photos

yes I think I might just get in there if thats the best way to do it the job - I'll keep those gaps open then until the wing is fitted.

Phil Cooke17/02/2020 23:43:30
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2586 forum posts
1824 photos

Some more sheeting added to the rear lower fuselage, again leaving ~ 3 short tapered planks needed each side around the curvy corner. And the tailplanes, now laminated with their little tips added.

fus rear sheet.jpg

Dallas Crisp18/02/2020 05:47:02
10 forum posts

Hi Phil

Looks like your lower main wing spar is laminated, I am about to construct mine. Cannot see in your thread what you used, could you please give some recommendation. I have never been able to obtain spruce around the local hobby shops. Thanks.

Phil Cooke18/02/2020 08:42:41
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2586 forum posts
1824 photos

Hiya Dallas,

If you are glassing your wings then spruce really isn't essential - hard balsa would be fine - the final assembly with all the shear webbing front and back is very robust. I didnt have any spruce of the right dimension either - good on width but not deep enough for the pre-cut rib slots. So I laminated what I had with balsa to achieve the depth. The top spar was just balsa, cut from hard sheet.

Balsa would be fine top and bottom if you cant get hold of any spruce or alike.

Phil Cooke21/02/2020 22:38:41
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2586 forum posts
1824 photos

Still finishing the fuselage planking here and about to make up the tailplane rods...

team sabre 3 view copy.jpg

I've spent an evening sizing and scaling some of the decals for my Yugoslavian aerobatic scheme - and with all the data to hand I've just sent Callie at Callie Graphics an email for a quotation. Excellent service as always she has quoted within 24 hrs meaning I've now placed my order for some gloss vinyl roundels, stars and registration codes. Another weight off the mind... still plenty to do!

Callie has a few sets of Sabre decals already within her 'off the shelf' range - but will also make up any bespoke decals to any scale - well worth a look if you're thinking of self adhesive vinyl as opposed to paint!

info@callie-graphics.com

roundel.jpg

 

Edited By Phil Cooke on 21/02/2020 22:41:22

dirk tinck22/02/2020 00:58:05
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623 forum posts
857 photos

That's going to be the cherry on the cake Phil !I might consider it too...If i don't do paint masks...

Are you considering a cockpit frame ?

Cheers , Dirk

Phil Cooke22/02/2020 08:29:58
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2586 forum posts
1824 photos

Hiya Dirk - yeah Callies work is really good, I'm looking forward to seeing these unusual roundels when they are complete!

As for the canopy frame - I have so nearly sent you a mail asking for one of your frames on 2 evening updates now, but I'm trying to avoid giving us both the extra work!! I'm going to resist - on the Hurricane and the A-4 I was able to make a little framework ridge with the airbrush and tape - with a grey or green coat first (to get the colour on the inside) and then a few top coats upto a double thick tape mask you can easily achieve the 0.5mm ridge with paint. I'm going to keep it simple and go that way again I think, but many thanks for the kind offer of making one for me!

Phil Cooke22/02/2020 23:24:38
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2586 forum posts
1824 photos

A minor milestone - planking finally completed on the bottom fuselage surfaces rear of the wing. I'm leaving the small gap ahead of the wing to aid fitting the wing dowels one day soon!

planking 6.jpg

I've cut and made up the laminated fin panels tonight too.

Dallas Crisp25/02/2020 07:41:08
10 forum posts

Hi Phil

I was going to use Hitec HS-85MG+ servos for my ailerons and elevator, ( which I have four of) but I noticed you are using HS-65MG+.

Could you please advise as I am not sure what to use, again thank you for your time.

Phil Cooke25/02/2020 12:33:10
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2586 forum posts
1824 photos

Hiya Dallas,

I think the 85MG+ is a sound choice for this model so keep going with your planned installation!

I will be fitting an 85MG+ on my elevator for the increased torque, as I've also done on the twin drop tank release (might be overkill here but when I was building it ad-hoc I wasn't sure how smooth the final operation would be and chose the bigger servo for a confident release)

I've found the 65MG+s are more than adequate when using one per flying surface on the ailerons of PSS models of this sort of size, they are a little smaller and only half the weight of the 85MG but still give a 2kg pull - so this is all good - and well proven on the 2018 mass build Hurricane.

Peter Garsden25/02/2020 13:53:03
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1727 forum posts
1297 photos

Hiya Dallas servo choice is very subjective. I am also using the 85mg for elevator for exactly the same reason as Phil. Rudder can be a much cheaper servo as the torque is less. I am using a £10 KST servo. I would not use the Hitec 85MG for ailerons because it is a bit heavy to put near the wing tips I am using 2 Emax metal geared servos which are vew cheap and reliable also about 5 pounds. If you are doing torque rods then OK but a bit overkill 65mg would be a better choice. For flaps I have gone for Savox 255mg £16 and 3.7kg of torque. Just what you need for the force required when trying to slow it down at 40mph. Other servos will do but this is my choice.

Martin Gay25/02/2020 14:35:38
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396 forum posts
255 photos

Hi Dallas,

The prototype, and the Gamma build, used a standard sized servo on the elevator and 2.3kg pull micro servos (Turnigy TGY-9018MG) on the rest of the surfaces.

Martin.

Edited By Martin Gay on 25/02/2020 14:35:55

Dallas Crisp25/02/2020 22:25:00
10 forum posts

Hi

Thanks for all the info and input, much appreciated. PSS building is relatively new to me. Looking forward to the fly in on the 13th. Hope the corona virus does not impact on peoples travel plans. My wife and I are in our late sixties and will be travelling up from Australia. Again thanks.

Phil Cooke29/02/2020 09:13:00
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2586 forum posts
1824 photos

Before I can complete the top planking its time to build up the tail actuator and fit a pushrod and servo to suit.

I've gone for a centrally mounted servo positioned slightly rear of that shown on the plan - at a depth where the central wing pushrods will all clear whilst still allowing access to the battery box. With the fus inverted a reinforced plate sits between the flats on F4 and F6.

ele servo 1.jpg

On the other side the joint is then bolstered with triangular section.

ele servo 2.jpg

Edited By Phil Cooke on 29/02/2020 09:33:34

McG 696929/02/2020 09:45:48
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3228 forum posts
1223 photos

Very neat once more, Phil,

I'm close to that stage as well, but I'm now considering the use of a Corona 238MG for the elevator.

Are you using the SLEC bellcrank as per Martin's drawing?

Cheers

Chris

Phil Cooke29/02/2020 10:24:01
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2586 forum posts
1824 photos

yep, the unit exactly as shown on the plan... I picked one up at the last trade show of the season!

Edited By Phil Cooke on 29/02/2020 10:24:13

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