By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by CML

Rob's F-86F NASA 228 research aircraft build

All Topics | Latest Posts

Search for:  in Thread Title in  
robk26/01/2020 17:42:31
avatar
120 forum posts
167 photos

Had a couple of weeks off the Sabre putting a Wild Thing together - done now and just waiting for a nice wind at the Orme or similar. So back to this one. Time to do the tail assembly and control system. Started with an easy bit, assembling the tail surfaces. I just got some 12mm thick medium balsa rather than gluing two 6mm sheets together.

img_1758.jpeg

Edited By robk on 26/01/2020 17:43:00

robk02/02/2020 17:33:39
avatar
120 forum posts
167 photos

I have had a bit more workshop time this weekend. I marked up the tail surfaces ready for planing and sanding. Done now and these lines really helped. img_1765.jpeg

robk02/02/2020 17:38:26
avatar
120 forum posts
167 photos

 

I have also installed the all-moving stabiliser control runs and the servo mount. I am not going to have a rudder servo - its a scale aircraft for me not an aerobatic one. I thought I might be able to fit a torsion rod but the stabiliser control system is in the way so it would have been a pretty obvious snake or wire loop system which is a bit early 20C for a jet! We will see if it flys ok. Fingers crossed.

img_1763.jpeg

img_1768.jpeg

img_1767.jpeg

 

 

 

Edited By robk on 02/02/2020 17:41:08

Edited By robk on 02/02/2020 17:44:23

robk02/02/2020 17:46:50
avatar
120 forum posts
167 photos

Constructed the cockpit area (after joining the halves together). I glued in the fin first, making sure the elevator control runs freely. I trimmed the canopy first to see how it would fit and tried it in place as I built up the fuselage.

img_1771.jpeg

Phil Cooke02/02/2020 19:50:14
avatar
2588 forum posts
1824 photos

Looking good Rob - a major milestone to get the two halves joined and the fus fully planked!!

McG 696902/02/2020 20:04:36
avatar
3241 forum posts
1229 photos

Phil 's right here, Rob.

Great progress indeed, but your fuse doesn't really look as 'fat' as my Dog's one... wink

Keep going, young man.

Cheers

Chris

robk07/02/2020 18:25:45
avatar
120 forum posts
167 photos

Thanks guys.

Did a bit more this week getting the stabiliser right. I made mine out of 12mm thick balsa, shaped and sanded it then carefully measured where the piano wire rods would fit using the plan and the semi-complete fuselage. I cut grooves in the top of the stabiliser and epoxied in snug fitting aluminium tubes (I couldn't get brass the right size) holding the stabiliser at the correct angle with some tape and pins. Once set I removed them and put more epoxy in with thin balsa covers on top. Sanded these so they are flush and refitted the stabilisers. They are just about tight enough to not come off in flight but still removable for finishing etc. Good design Martin and Gordon.

img_1777.jpeg

img_1779.jpeg

Edited By robk on 07/02/2020 18:26:29

robk12/02/2020 15:42:00
avatar
120 forum posts
167 photos

Fitted the wing by rounding off the fuselage planking and a bit of judicious sanding. Inserted the dowels at the front to get a fixed location then discovered I didn't have any captive nuts to fit my SLEC M5 wing bolts at the rear (I like these ones as they break on a heavy landing rather than the wing mounting). But I taped it in place so I could continue whilst they come in the post. Before finishing the underside planking I glued in 100gm of lead into the nose (the Gamma needed 110gm so I can add a bit more either in the battery box or in the nose later). Looks like I'm close in these pictures but I know its still miles away...

img_1789.jpeg

img_1792.jpeg

Edited By robk on 12/02/2020 15:43:04

robk12/02/2020 15:45:33
avatar
120 forum posts
167 photos

Also better introduce my pilot courtesy of Freewing and €5 plus postage from Utrecht. He's the right size but will need a bit of surgery to fit in... Thanks for the recommendation Chris.

img_1788.jpeg

img_1790.jpeg

Edited By robk on 12/02/2020 15:47:09

robk18/02/2020 18:21:44
avatar
120 forum posts
167 photos

Carrying on. I pinned some thin balsa fillets onto the fuselage so I could trim and fill it so it fits the top of the wing closely.

img_1798.jpeg

img_1799.jpeg

Fitting soft balsa below the wing to continue the fuselage profile.

img_1801.jpeg

img_1816.jpeg

 

 

Edited By robk on 18/02/2020 18:22:13

robk02/03/2020 18:11:58
avatar
120 forum posts
167 photos

Sorting out the cockpit. I made a cardboard template for the section in front of the windscreen then made it up from thin ply bent around a pop bottle. The cockpit fittings are just balsa offcuts. Im not sure if you can see I have made an instrument panel up from my battery condition LED meter with a few scale dials added. Its stand-off scale!

img_1819.jpeg

img_1820.jpeg

Phil Cooke02/03/2020 19:51:10
avatar
2588 forum posts
1824 photos

some excellent progress with the build here Rob - the belly pan and cockpit layout look really good! thumbs up

robk07/03/2020 15:58:34
avatar
120 forum posts
167 photos

Thanks Phil...

I have inserted some hardwood into the control surfaces so I can screw the control horns directly into them rather than having a retaining plate on the top of the surface (I always get the bolt holes wrong anyway!)

img_2017.jpeg

As a delay before getting onto the scary bit (glassing!) I finished off the airfix model - already proven to be of use in getting some of the difficult profiles right(ish).

img_2015.jpeg

And finally my first stab at a trial glassing. I did an elevator bottom surface. I had a good tutorial from my friend Nick so the process went ok, but... I may have got the mix wrong as its been a couple of hours and it hasn't set yet. Leave it overnight and fingers crossed. Watch this space.

img_2027.jpeg

dirk tinck07/03/2020 22:18:13
avatar
627 forum posts
860 photos

Hi Rob,

A possible cause of your resin not drying is that the two components are not mixed around enough. It's a common mistake to use the resin out of the mixing cup.The parts that ''hang on the walls'' are never mixed well.It's better to pour eveything in a second cup and use that to work with.Especially when you're low on resin and want the last bit out of the cup and scrape everything out,you're using the parts that are not mixed. Again IMO...

Good luck !

Dirk .

robk08/03/2020 14:25:28
avatar
120 forum posts
167 photos

Thanks Dirk. It dried overnight fine - just a bit slow so I've moved onto the rest of the elevator, control surfaces and the wing. Im not using a mixing cup as the resin I am using is mixed by weight on 0.1g scales. You are right about getting everything mixed up properly though.

robk15/03/2020 18:31:50
avatar
120 forum posts
167 photos

Been busy glassing. In the swing of it now and have done the wing both sides, the tailplane, all the control surfaces, and the bottom of the fuselage - just the sides to go. Mostly ok with a very small number of bubbles here and there. I have used a scalpel to cut these out and re-glassed those bits.

img_2028.jpeg

img_2048.jpeg

Chris Barlow15/03/2020 20:06:57
avatar
1904 forum posts
1308 photos

How are you finding the peel ply Rob? The Sabre was the first model I've used it on and have found it leaves a very nice finish, plus it's oddly satisfying to peel off!

robk22/03/2020 18:57:48
avatar
120 forum posts
167 photos

My feelings exactly Chris - it is not difficult or expensive to use. I guess I will know how good the surface is when I start sanding... Nearly done with the glassing now anyway. For obvious reasons having a bit more time to spend in the workshop right now...

img_2069.jpeg

robk29/03/2020 13:26:36
avatar
120 forum posts
167 photos

So here is the Sabre now fully glassed - feels like a milestone. I was worried about this process but it was not as tough as I thought. That said, my finish is no doubt not as good as some would accept - stand off scale!

img_2081.jpeg

Edited By robk on 29/03/2020 13:35:51

robk29/03/2020 13:28:00
avatar
120 forum posts
167 photos

I also have fixed the flaps and ailerons in place. Glued in place with cyano and then small holes drilled for glued in pegs made from tooth picks.

img_2080.jpeg

Edited By robk on 29/03/2020 13:36:28

All Topics | Latest Posts

Please login to post a reply.

Latest Forum Posts
Support Our Partners
Sussex Model Centre
Slec
CML
electricwingman 2017
Sarik
Advertise With Us
Latest "For Sale" Ads
Has home isolation prompted you to start trad' building?
Q: The effects of Coronavirus

 Yes - for the first time
 Yes - but Ive bashed balsa before
 No - Ive existing projects on the bench
 No - Im strictly an ARTF person

Latest Reviews
Digital Back Issues

RCM&E Digital Back Issues

Contact us

Contact us

Magazine Locator

Want the latest issue of RCM&E? Use our magazine locator link to find your nearest stockist!

Find RCM&E!