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Flyer's F86 Sabre

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dirk tinck29/12/2019 22:53:13
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578 forum posts
810 photos

Will be following Ade,my brakes are as good as ready !Took me 2 weeks tough... Good luck !

McG 696930/12/2019 17:55:55
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3152 forum posts
1194 photos

... "building properly in February", Ade?

I do realize it's not a F1 GP, but my best guess is you will be painting the 'conservatory' in Gold again... devil

Cheers

Chris

Flyer30/12/2019 19:12:51
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594 forum posts
104 photos
Posted by McG 6969 on 30/12/2019 17:55:55:

... "building properly in February", Ade?

I do realize it's not a F1 GP, but my best guess is you will be painting the 'conservatory' in Gold again... devil

Cheers

Chris

Busy couple of weeks ahead Chris, so I thought I can sort out the 3d printed air brakes, so that when I'm building they should just slot in. I've also 'negotiated a two week period in Feb that I need to be home from work...…….' Building will commence at a rapid rate then, helped I must say, by the efforts of the lads. Will be making a 'special' canopy plug in the next few weeks, in between work.

Cheers

Ade

McG 696930/12/2019 19:44:55
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3152 forum posts
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Enjoy your spare time then,Ade. yes

... and don't forget to show us that 'special' canopy plug then...

Cheers

Chris

Flyer08/02/2020 20:41:23
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594 forum posts
104 photos

why 3?FINALLY !

Laid down plans this afternoon and have made a start. Have also been trying out new 3D printer to fill the cockpits !

Hope to join fuselage of number one next weekend. Started with the fuselage as I have been dreading the planking, and have never built a model like this before. Thanks to the other bloggs, and by studying the plans, it's actually quite straightforward.

Few pics to date.

Cheers

Adelaying out

Flyer15/02/2020 14:17:51
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594 forum posts
104 photos

sabre airbrake deployed.jpgOk, now trying to work out the deployment of the airbrake. I made a mock up to prove that I've got the general idea. Not sure why the picture does not show correctly, but blames new iPhone!

 

The prototype is way out is shape over the shape shown on the plan, but this exercise was to establish the angles of the hinging. The opening mechanism should be a type of lever, from central, carbon push rod, transferred thro bell crank to 3mm pushrod and clevis.

sabre air brake prototype.jpg

Edited By Flyer on 15/02/2020 14:18:28

Flyer25/02/2020 21:03:04
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594 forum posts
104 photos

If I wanted to plank...…..... I'd have taken up boat building !!!! angry

But almost progress

Pics soon

After I've found a few kg of filler ...…...

cheers

Ade

Martin Gay25/02/2020 21:35:43
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381 forum posts
254 photos

It will get easier on the second Sabre.

"Practice makes perfect!"

Flyer25/02/2020 21:43:24
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594 forum posts
104 photos
Posted by Martin Gay on 25/02/2020 21:35:43:

It will get easier on the second Sabre.

"Practice makes perfect!"

Thanks Martin, hoping to lay the second ( and longer) one down on Sunday. Hope to debut working airbrakes in situ too. Am I correct in noting that if I use a rudder, that the mechanism could be inline with the tail controls?

Is it a case of clever bending of control rods around said elevator?

Cheers

Ade

Martin Gay25/02/2020 23:11:17
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381 forum posts
254 photos

Chris Barlow, and others, has made a hidden rudder linkage. Check out his build blog.

The prototype used a snake whilst the Gamma used a closed loop system.

Flyer02/03/2020 07:32:21
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594 forum posts
104 photos

A little more done on fuselage one. Finally bought myself a cheap Balsa Stripper. Why had I not bought one years ago I do not know. This has made planking a lot lot easier, and has made it almost bearable!

balsa stripper.jpg

So, I now have two halves; tonight I will remove the second half off the building board to see if they line up. Hopefully I've built matching halves blush. Learning new skills all the time; I had thought that you cant teach old dogs new tricks............ I just perfect the ones I know!.

planking !!.jpg

Cheers

Ade

McG 696902/03/2020 18:38:59
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3152 forum posts
1194 photos

... oooh, Ade. surprise

I can't imagine you building all those years without a Master Airscrew balsa stripper.

By the way, it's not a "cheap" tool, but 'elementary', my Dear Flyer.

A bit like playing Fantasy GP without proper 'octopi'... wink

Cheers

Chris

Flyer23/03/2020 07:54:54
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594 forum posts
104 photos

Yesterday I managed to finally cut out the additional formers and lay down the keel of the second airframe.

Used my new scroll saw for the first time; does that make me a 'real' modeler now? Or do I have to design and build first?

Anyway, stay safe lads, and see you all on the hill when conditions allow.

cheers

Ade2 seater laydown 002.jpg

2 seater laydown 001.jpg

Edited By Flyer on 23/03/2020 07:55:25

Flyer06/04/2020 09:15:21
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594 forum posts
104 photos

Well, spent the weekend trying to get a workable solution to the air brakes. It's not perfect, but I've worked out a solution, that should do the job. Just need to 3D print a connector to link the brake actuator to the brake, but that will not take long. The brake is held on the hinge bracket by a 2mm rod, which itself goes through a hole in the additional liteply bulkhead. The bracket itself will be bolted to that bulkhead, so could be removed if necessary. Once this is in position, I will glue balsa onto the brake to enable final sanding.

sabre air brake 1 001.jpg

sabre air brake 1 003.jpg

Also, I'm trying to establish the maximum width of the canopy please. I have the height and length, but am struggling with the width.

Cheers

Ade

McG 696906/04/2020 19:52:10
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3152 forum posts
1194 photos

Hi Ade,

I remembered your question when I was at La Grotte today, so if it can help you, the width of my canopy at the maximum width - ie. about 10 > 15mm behind the point where the full size canopy slides back - is 84mm.

Hope this helps

Cheers & keep safe

Chris

Flyer06/04/2020 20:35:36
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594 forum posts
104 photos
Posted by McG 6969 on 06/04/2020 19:52:10:

Hi Ade,

I remembered your question when I was at La Grotte today, so if it can help you, the width of my canopy at the maximum width - ie. about 10 > 15mm behind the point where the full size canopy slides back - is 84mm.

Hope this helps

Cheers & keep safe

Chris

Thanks Chris, that helps me immensely. I hope to have two canopy plugs ready within a week!

cheers

Ade

Flyer10/04/2020 08:06:33
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594 forum posts
104 photos

Well, after putting it off for many days, I've finally made up the tail plane actuator. It was actually not as bad as I had thought, and many thanks to those of you that have given guidance. All I have to make now is the second set, but that's today's job.

One question I have is regarding the tailplanes. Are you gluing this on permanently, or are the piano wire supports held by friction in tubes set into the tail planes?

Finally, I've now glued up my blank for the canopy plug. The canopy itself is close to 19 inches, and I'm making the plug out of mdf. I find that this gives a good plug, and will handle the pressure of being moulded without distorting. The final finish on it is P38 body filler, which when polished with wax, allows a good release of the PETG once pulled.

I'll be shaping the blank over next few days; pics to follow.

Cheers

Ade

canopy blank.jpg

McG 696910/04/2020 08:51:07
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3152 forum posts
1194 photos

Hi Ade,

I remember reading some builders kept the tailplanes on just by friction with only a spot of Pritt, while others are gluing them at the very end of the build - ie. after glassing and painting.

As I have no dihedral with my Dog, I think I will glue them at the end.

Maybe some Sabre guru can jump in to help?

Cheers

Chris

Martin Gay10/04/2020 09:34:30
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381 forum posts
254 photos

I don't glue the tailplanes on. I have yet to lose one in flight. It also makes storage easier.

Flyer20/04/2020 08:14:02
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594 forum posts
104 photos

004.jpgAirbrake mechanism2.jpgCheers Martin, I'll give that a go.

I've struggled to get a working solution for the air brakes. I was going to use a connector to join both brakes together, but, on reflection, I think I'll use individual min servos, as it will have less slop in the system, and also allow a little bit of adjustment on each airbrake. I will now have an access hatch under the fuselage, 'just in case'. There are hand holes in the formers, which are approximately where I need the mechanism to go. I've 3D printed some plastic 'bearings' to give smooth operation of the brakes. The servo will pull the linkage to open the brakes, and push to close. I attach a few pictures that hopefully show the detail. The hinge line is not vertical, which does give a small droop on opening, however, I'm not sure if it's enough. Balsa will now be added to the profile on the outer face to blend in with the fuselage. A thin balsa 'box' will be added inside to clean up the install, and this will be fitted before joining the two halves.

Airbrake mechanism1.jpg

cheers, Ade

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