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SFS 31 Milan

Fans and Thermals.
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Noël Rumers
Posts: 281
Joined: 20 Mar 2015, 10:29
Location: Hoboken Antwerp

Re: SFS 31 Milan

Post by Noël Rumers »

Hi Cliff,
To which scale will the the Blanik/Vivat be? I look forward to see the design!
I have been working on mine last year November too. It had to be in the air somewhere...
Years ago I did cut the polyurethane foam blocks to size... never got to the point to start gluing them together due to other projects.
Last year I had to reorganize the space I have so, this was the time to sort things out. I also did find mistakes in the shape that had to be solved.
All blocks are at the highest point painted black so I can sand to that line to get the right shape in the end.
The scale of mine is 1/2.75. The fuselage shall be in two parts as well as each wing. The hinges for the elevator are milled by CNC to fold up like the real plane, both the Blanik and the Vivat. Will be for next year...
I have lots of detailed info on both planes as well. We had two Vivats in Belgium flying. One had be written off due to a forced landing on a lake in the south of Belgium. It had been salvaged from a depth of 10 m. I have the main landing wheel and e few other part of it at home. The fuselage welded construction, not often seen from a plane, is fully measured as well as other things.
See the drawings as well…
Noël
Attachments
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Vivat_WCA_Storry_156.JPG
Vivat_WCA_Storry_190.JPG
Vivat_WCA_Storry_198.JPG

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Noël Rumers
Posts: 281
Joined: 20 Mar 2015, 10:29
Location: Hoboken Antwerp

Re: SFS 31 Milan

Post by Noël Rumers »

...the Milan again...
The landing gear had a weak spot. The bold that was used to arrange for the pulling in and holding it into place both in and out was the problem.
After some study of the system A new part had to be made. This already was OK for Milan 1 but not on the second one. So back to the cellar to make the part.
The gap between both sides of the brass retracting arm was 30 mm. With the guiding block being only 10 mm this was asking for trouble with a harder landing. So the new block supports the bold over the full width of the gap. All is strong now and a nice job done again.
Noël
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Noël Rumers
Posts: 281
Joined: 20 Mar 2015, 10:29
Location: Hoboken Antwerp

Re: SFS 31 Milan

Post by Noël Rumers »

First I did want to reinforce the firewall to the sides of the fuselage a bit more. Had to do this also on Milan 1. Glass fibre cloth and epoxy did the job with some thinkened epoxy to fill the corners and round the sharp edges a bit. The fuselage inside was painted and the fuselage sides at the point where the radio and other stuff was installed had to be closed. Most of the time the fuselage is always too small to work with both hand in... so I left these parts open to the very end.
A template was made and a reinforcement spar installed to give the 0.6 mm ply some more stable setting.
Noël
Attachments
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Cliff Evans
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Joined: 29 Dec 2019, 15:13
Location: Bristol
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Re: SFS 31 Milan

Post by Cliff Evans »

The Vivat is 1/3 scale will email the plans for you to look at.
https://lasercutsailplanes.co.uk
https://patteaklegliders.co.uk

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Noël Rumers
Posts: 281
Joined: 20 Mar 2015, 10:29
Location: Hoboken Antwerp

Re: SFS 31 Milan

Post by Noël Rumers »

OK Cliff,
I look forward to see them. Maybe better a bit smaller, but the engine I had in mind was the ZG62. Now we have other options too. Also electric is better now than in the old days, when I was planning the Vivat.
Still, bigger plane, fly better! ;)

Noël
Attachments
Vivat_LNO003.JPG
Vivat_LNO004.JPG
Vivat_LNO009.JPG
Vivat_LNO011.JPG
Vivat_LNO015.JPG
Vivat_LNO016.JPG

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Noël Rumers
Posts: 281
Joined: 20 Mar 2015, 10:29
Location: Hoboken Antwerp

Re: SFS 31 Milan

Post by Noël Rumers »

...and the Blanik...
This one was owned by a good friend. He was serviced and after it got back the wing tips were changed.
A storry with a strom and things on the road... But still a one off! and easier to build I recon.
See also the wings TE. I was able to measure the wing. At mid wing, the start of the aileron, the wing TE was 40 mm up from the straight line.
The LE however was straight!
Wing at rood 4°, at mid wing 1.5° and at the tip 1°. Wing rood to mid wing, is the Naca 63²A-615 and at the tip the Naca 63²A-612. Being 15% and 12% thick.
Noël
Attachments
Blanik_real_wing001.JPG
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