Discussion in 'Aircraft Design / Aerodynamics / New Technology' started by rtfm, Aug 6, 2019.
Some specs for the Hirth F23. But ye gads - check those prices. Here in OZ we need to add 25%
I would shop around- world wide if needed to find a fair price.
Been finalising my CAD files and working out (1) what wood I need and (2) how to actually construct what I've drawn. Here are the sheets I'll need for the fuselage. The blue sheets are 3mm, the yellow, 1.5mm
Just an observation... thin strips of thin ply aren't very stiff when you bend them parallel to the surface grain. It looks like your using a whole lotta ply to add very little strength or stiffness.
Ha ha. The ply "strips" are exactly as wide as the 19mm x 19mm Hoop Pine (our version of Spruce) and their job is to position the backing Hoop Pine. Makes actual construction a breeze, because there is absolutely no measuring. And the fillets at the joins act to encapsulate the cnc cut corner reinforcing pieces. Everything bonded with t88
I know your going to glue the ply to square sticks. I'm just saying those thin strips won't add much strength of stiffness. ...maybe I'm just not seeing how it all goes together yet.
I think what he was saying is that they are there simply as alignment guides for the square sticks, and not intended to increase stiffness.
To me seems a lot of wasted wood when cutting out those voids. Why not just use the fillets?
Because for the price of a little plywood you get a perfectly aligned fuselage.
Like the clecos on the Ranger, perfect/simple alignment is a good thing. But why carry your alignment fixture with you the rest of your life? ...and smearing that much glue during it's very limited open time is going to be a challenge.
But I don't know what rtfm has in mind, he's probably worked all of that out.
Hi. I've worked with t88 quite a lot. Plenty of time. Of course, one wouldn't bond the entire side at once. Outsiders first, then the inside pieces in two passes.
I worked out the weight of the templates. I can't remember exactly what they weighed, but it wasn't very much.
As for all the unused bits... I plan to use those areas to cut out a few other parts also, like parts of the tail feathers and the aft fuse. Also to cut some unrelated projects, like a cover for my 3d printer, and some stuff for my wife. Not a lot of wood going to waste.
I'm back from my business travels. Only to discover that one of the 3D Printed parts for my Lowrider2 CNC router doesn't fit. Bugger. And to compound things, I have bought a new Duet3d WiFi board for the 3D printer, and can't get it to work. Long story short: 3D printer buggered, CNC router waiting for parts. AAAAARGH! Can't stand it.
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