Michael Barclay

My next build will possibly be the Grumman Duck, But it might be a while before I get on with it, as I am thinking of moving.

The 3 mm looks good and easier to bend for complex shapes but I wonder if the weight saving is lost on the extra framework needed to keep it rigid. I will get some and try it.

I use a 6mm depron spar but only as a spacer between upper and lower surface of wings.

I haven't tried it Eric, but will probably do so. Thing is I still have 10 full sheets of 6 mm depron which suits my method of ribless construction. Guess when I eventually run out, I will try it. Does B&Q look alike take grp cloth and epoxy covering? I do like to cover my models. I have seen it, and it seems very pliable, whereas the original stuff is rigid, which again suits my construction system. But that's the nice thing about foam, there is lots to experiment with.

Sorry I don't do build photos Martin, I am always too absorbed with the construction. It's all 6mm Depron. The wing is built in a jig ( it's not folded but built up,) and has just one 2mm ply rib with a small block of hardwood to take the 2.5mm wheel strut. It's covered in one layer of 50 gram cloth with two layers at the wing joints. I think it might be called a stressed wing construction, and it makes very strong wings. All of my builds utilize this method, and II was at one time thinking of doing a video on YouTube but when Depron was discontinued there didn't seem much point.

50 inch span Depron JU87. All covered in 50gram grp cloth and west system epoxy. Scratch build from scaled up 3 view on Wikipedia, and lots of photos. Started out in white winter camo, didn't like it, so changed to two-tone green camo. Didn't like that so added desert camo which I quite like. 1300 grams flying weight. 35/36 900 kv motor.2200 3cell lipo.

Thanks Eric.Mike.

Hello Eric. Looks really nice. You say that you used depron and foamboard. Just wondering which parts are depron and which are foamboard.

I did think that neutral position would be correct, but still wondering if neutral flaps should be included in wing area calculations?

I am just completing my scratch build 50 inch (1.27 m) JU87, and I am considering flap and aileron settings in relation to the aerofoil section, and whether they should be set in line with the lower surface or upper surface as shown in A or B in my rough sketch, or at some point in between. The flaps are fixed to save weight, but adjustable, being mounted on aluminium brackets. The wing cubic load when the flaps and ailerons are included in the wing area is 12, but 15 if excluded, so having them contribute to the wing area would be quite nice. I will publish photos of the finished model, probably at the weekend. I imagine there will be quite a few different opinions on this so will get the popcorn out. Thanks in advance for your replies.

That's a shame, Eric. Looks like it belongs on water. I built a Heinkel HE5 in Depron which flies beautifully off grass, but I did glass it, and will fly off water when the field floods. Best of luck. It’s still a nice build.

Lovely job Eric. Have you flown it off water?

It's possible to build from many materials. Just think outside the box and be prepared to experiment and sometimes fail.

Hi Sheepish. I wish I was so prolific!