Back to flight, the tale of a wrecked Isaacs Fury

[OZPAF]

I didn't apply any dope, Anyun - left it as it was and from memory there was no sign of the glass weave. It just felt and looked like a stiffer form of tissue.

Unfortunately I've lost my original small sample but it wouldn't take that long to do another sample and weigh it.

John

[Anyun]

To continue the Isaacs Fury saga, now that the plane is getting closer to roll-out it's painfully obvious that the poor thing doesn't have anything to roll on yet. So, time to wheel in some wheels.

The tyre was made from laminated balsa and turned (mis)using a drill as a lathe. The centre was cut out and the inner edge then sanded by hand to get a nicely rounded balsa ring. The central part was made from blue foam, also formed using the drill.

The wheels ended up a bit heavier than i had hoped, about 0.5 grams each. The balsa used was harder than necessary, I could well have used some lighter stuff and saved a bit of weight.

The first photo shows the parts making up a wheel. In the second photo, one wheel has the outer and the other the inner side up.

[Anyun]

Here is the model with the wheels added. The wheels are connected on a 0.5 mm piano wire axle, which rotates inside a scale fake wheel axle made of a grass stem.

[Anyun]

I didn't apply any dope, Anyun - left it as it was and from memory there was no sign of the glass weave. It just felt and looked like a stiffer form of tissue.

I think that the stiffness might make it better than the paper I used, which isn't as rigid as I would like. The drafting vellum was better in that respect, but had its own set of problems...

[Anyun]

and continuing with the Isaacs Fury, next step was to add some wings. A biplane just isn't a biplane proper without its lower wings. The lower wings were attached to the upper wing with a carbon fibre strut, ensuring proper dihedral and alignment. The strut was then clad with balsa and the other strut members (made of balsa with inserted carbon studs) added.

[OZPAF]

A bit more info on tissue/glass composite.
 
I found my original sample and discovered that i didn't use epoxy on the glass. I then made 2 small samples - one withe glass attached to the tissue with spray contact and the other attached with epoxy.

I made the mistake of wetting out the glass cloth over the tissue. i should have added the epoxy to the cloth separately, and then applied the slightly wet glass to the tissue. Consequently this sample turned out too heavy and the epoxy changed the colour of the tissue.
The weave didn't show but the tissue was almost transparent.

Weight was 117g/m2 - way too heavy.

The second sample - cloth attached with spray contact, felt like a very strong tissue. There was no weave pattern showing and the colour was unaltered.

Weight was 24.3gms/m2

John

[Anyun]

Interesting, the cloth attached with spray glue might well be worth a try. The weight is excellent and not having to mess around with epoxy is definitely a plus!
Thanks for the research! /Andrea

[Anyun]

Time for Mr Pilot's weigh-in. A tad heavier than ideal at 0.57g, but acceptable.

Congratulations Mr Pilot, you are now hired for a permanent position as test pilot at the Pea & Nutty Aircraft Factory!

[Anyun]

A bit of background info on Mr Pilot: His progenitor was a clay bust, from which a silicone mold was made. In that mold, Mr Pilot was created from a combination of white glue and small pieces of toilet tissue.

The mold makes it fairly easy to make clones. That has in fact already been done in the form of Mr Pilot's twin brother, Monsieur l'Aviateur, who flies a Sopwith Strutter for l'Armee de l'Air. By the way, M. l'Aviateur prefers the French term  papier-maché rather than toilet paper when discussing his constituents.

The first photo show the process to make a mold, the bust rests on a soft clay bed onto which the silicone is poured. The second photo shows M. l'Aviateur in his Sopwith Strutter.

[Raggedflyer]

The second sample - cloth attached with spray contact, felt like a very strong tissue. There was no weave pattern showing and the colour was unaltered.

Weight was 24.3gms/m2


Extrapolating may offer a third version laminated as tissue/cloth/tissue to be say 40-50g/m2 ?

[OZPAF]

Extrapolating may offer a third version laminated as tissue/cloth/tissue to be say 40-50g/m2 ?

Which would put in the same area as straight lightweight paper . More experimentation is needed and if I do so I will put it up on it's own page.

John

[Raggedflyer]

https://hpa.aeromodelling.gr/index.php?topic=266.msg2516;topicseen#:~:text=Which%20would%20put%20in%20the%20same%20area%20as%20straight%20lightweight%20paper%20.%20More%20experimentation%20is%20needed%20and%20if%20I%20do%20so%20I%20will%20put%20it%20up%20on%20it's%20own%20page.,


That would be an interesting new topic to me for a couple of reasons...

I tried to configure a lightweight sheet covering to clad the top side of laser cut mimalist wings (2mm depron) previously but without success.

Secondly, wondering if a tissue/cloth/tissue ply could then itself be laminated as a 2ply for structural formers or spars.

[Raggedflyer]

That would be an interesting new topic to me for a couple of reasons...

I tried to configure a lightweight sheet covering to clad the top side of laser cut mimalist wings (2mm depron) previously but without success.

Secondly, wondering if a tissue/cloth/tissue ply could then itself be laminated as a 2ply for structural formers or spars.
[/quote]

[OZPAF]

Secondly, wondering if a tissue/cloth/tissue ply could then itself be laminated as a 2ply for structural formers or spars

I suspect that it would not match conventional balsa VG shear webs on a strength/weight basis, but I'll have a look in a separate thread as this is moving too far off Anyun's thread.

John

[Anyun]

The Fury (re)build is nearing its end. On of the more finicky details was the elevator control cables. They pass through the stabilizer, necessitating some kind of hemming. I cut it out from ordinary paper using a sharp knife and a magnifying glass. The hemming was glued to the covering and the covering then cut open inside the hole of the paper hemming.

I should also mention an unfortunate accident, where a drop of cyano glue was deposited just where it shouldn't be by a careless modeller. I (a.k.a. the careless modeller) was able to hide the resulting smudge somewhat with paint, but it still looks rather untidy...