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Re: Breguet Fauvette

Posted: 01 Feb 2019, 18:41
by StephenB
A little bit more progress, the ply formers are all cut and I started to cut the corresponding 1/16" balsa formers indivdually before realisng it was a mugs game, so glued the ply direct to a sheet of balsa and then clamped them up to dry overnight:

IMG_1723.JPG
IMG_1725.JPG

I then produced a spliced join on the spruce longerons, not easy on 1/8" x 1/4" material, something a bandsaw probably would have handled better than my Dremel. In the end I found the best and most accurate method was to use the coarse side of my perma-grit to bevel each piece. PVA and clamped overnight:

IMG_1724.JPG

Then on to cutting out the ribs for the ruddervators, I was surprised how tiny they looked - I think these will be quite delicate when finished with just a balsa leading edge and spruce trailing edge to add:

IMG_1727.JPG

Re: Breguet Fauvette

Posted: 01 Feb 2019, 22:29
by Peter Balcombe
Going ok then Stephen.
I used a razor saw to cut the strips for my splices, but whatever method works for you.

Re: Breguet Fauvette

Posted: 02 Feb 2019, 09:38
by John Vella
Stephen, I agree that the razor saw is a good way of cutting strip wood splices. I have a series of fine to coarse blades for different materials. I have found the painful lesson in the damage these blades can do to fingers if you lose control. Regards John.

Re: Breguet Fauvette

Posted: 02 Feb 2019, 11:55
by B Sharp
I tend to agree with all the comments as I have yet to find the perfect splicing method. Its impossible to get a good splice cut with my Dremmel jig saw or even with my razor saws. Also the longer the splice the harder it becomes.
My fall back method is to roughly angle cut the spars with the Dremmel then after clamping one cut on top of the other sand them together with my perma-grit block. This is not perfect but does give a fairly good fit.
Brian.

Re: Breguet Fauvette

Posted: 02 Feb 2019, 11:59
by chris williams
60 grit disc on a disc sander works wonders...

Re: Breguet Fauvette

Posted: 02 Feb 2019, 19:41
by SP250
Have used my router mounted upside down in the workmate and screwed temporary angle iron fence at the required taper angle to the top.
Works for me, just mind your fingers though.

John M

Re: Breguet Fauvette

Posted: 04 Feb 2019, 18:18
by StephenB
A bit more progress, the tailplane ribs were produced using the sandwich method so should soon be able to put the empennage together:

TP Ribs (1).jpg

Now gettiing close to assembling/glueing the fuselage together, I tried a dry fit on the jig to make sure everything went together or needed some final fettling:

Dry Jig (1).jpg

I might have erred in producing former supports that are too simplistic, I have marked the datum line on all the formers which gives me a horizontal reference point but I'm finding it a lot of faff to measure up from each side to level them, unclamping and re-clamping is not the most precise method of adjustment. I notice that others have produced T shaped supports with a horizonal bar extending outside of the former. I have thought of making a new set of supports but I'd like to avoid that if possible so I'll have another jiggle around tomorrow and see if I can crack it with the set up I have.

On a more positive note, I went shopping this morning and came back with a piece of plasterboard ideally sized at 2M x 600mm for building the wing on. I say wing as there is only one on the plan, any suggestions for the easiest/quickest method of producing the second one?

Re: Breguet Fauvette

Posted: 04 Feb 2019, 18:28
by Peter Balcombe
Stephen,
Also possible to trace the important lines on the rear of the plan sheet if you temporarily tape the plan to a large window/patio door pane (printed side to glass).
The rear illumination then shows up all of the print on the reverse side ;)

Re: Breguet Fauvette

Posted: 04 Feb 2019, 22:24
by RobbieB
StephenB wrote:
04 Feb 2019, 18:18
'.................I might have erred in producing former supports that are too simplistic, I have marked the datum line on all the formers which gives me a horizontal reference point but I'm finding it a lot of faff to measure up from each side to level them, unclamping and re-clamping is not the most precise method of adjustment. I notice that others have produced T shaped supports with a horizonal bar extending outside of the former. I have thought of making a new set of supports but I'd like to avoid that if possible so I'll have another jiggle around tomorrow and see if I can crack it with the set up I have.

On a more positive note, I went shopping this morning and came back with a piece of plasterboard ideally sized at 2M x 600mm for building the wing on. I say wing as there is only one on the plan, any suggestions for the easiest/quickest method of producing the second one?'
Stephen,

The jig adaptor plates are ok, just need a bit of fine tuning and a better way of clamping the formers to them.
Make sure each plate is in contact with the jig base once secured to the ali angle - that way they can't rock from side to side.

Also, I never found those spring clamps, even heavy duty ones really satisfactory for this job - proper mini g-clamps are much better, done up really tight and preferably one each side when you are at the early stages of construction when you are struggling getting longerons to fit.
skylark_jig.jpg

Re: Breguet Fauvette

Posted: 05 Feb 2019, 07:27
by StephenB
Robbie, thanks for the comment and the photo.

I know what you mean about the spring clamps - I'm reluctant to go to anything bigger as they will crush the balsa on my ply/balsa laminate formers, getting G-clamps in might be problematical as the gap between my formers is quite narrow compared to your fuselage (65mm at worst). Although I notice on yours you haven't clamped each former??