SHORT BROS NIMBUS SCALE 1:3.5

Let us all watch your new project progress.
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Jilles
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Joined: 22 Mar 2015, 10:27
Location: Australia
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Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Jilles » 27 Aug 2019, 05:03

Wings are all painted and gear installed. Today the model was assembled in full and the nose ballast measured.
I used a bucket of water connected to a temporary eye-bolt in the nose cone
Also used a luggage scale, these are accurate within 50 grams
the scale showed 2.16 kg, the bucket with water and eye bolt 2.19 kg, the difference being the eye-bolt the scale does not measure.
I had temporary bolts in the wing stubs were the C.O.G should be and the glider was carried on those bolts by strings.
Because the pick up points are so low and the actual structural C.O.G on top of that, a stable attitude could not be reached.
It either moved forward or rearward when the required load was reached. A way to overcome this is to measure the model up side down, but I did not do this today.
With an estimated additional weight of 150 grams of fuselage paint the total flying weight will be 12 kg. This was my target so I am happy. with that.
I will now pour the lead weight into a plaster mold what will be shown on a future post.
The plan is to have the fixed nose weight at 1.9 kg so I can make final adjustments as required later and allow for additional weight to epoxy and finish the nose cone to the fuselage.
.
Attachments
W69.jpg
balanced with bucket of water
W70.jpg
W71.jpg
luggage scale attached
W72.jpg
W73.jpg
W74.jpg

Jilles
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Joined: 22 Mar 2015, 10:27
Location: Australia
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Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Jilles » 28 Aug 2019, 06:48

A plaster mold was made with a 3D printed part with the contour of the inside of the 3D printed nose cone
This mold was made some month ago so it could dry out properly. I am told that when you pour liquid lead in a moist mold things can get interesting.
Cooked the lead and poured. the surface is a bit rough but that works for me. Gives a good hold of the epoxy used to fit the weight in the nose cone.
Wednesday day morning is one of my flying days. I took the Nimbus to the field for a show and tell and got proper pictures because at home there is not much space. It was also a transport test to see if all works fine in the little truck.
Attachments
F02.jpg
F03.jpg
F04.jpg
F01.jpg
F05.jpg
F06.jpg
F07.jpg
F08.jpg

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Peter Balcombe
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Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Peter Balcombe » 28 Aug 2019, 08:53

Very nice Jilles.
We all look forward to hearing about the maiden flight which cannot be too far away now :)

Jilles
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Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Jilles » 03 Sep 2019, 06:47

Nose cone with ballast was fitted to the fuselage.Epoxy and four M4 bolts do hold it to the fuse. Also two layers of glass was added over the joint line. Plastered builder bog around it and sanded into shape. The fuselage is now covered with a layer of spray putty and primer. Waiting a day to let is cure than do the final sanding. I use automotive acrylic paint in spray cans. For the once a year I do some painting it is not economical to invest in a compressor and spray gun. Not to mention the cleaning of the equipment required so it will work the next time.
Attachments
20190903_100731.jpg
20190903_100738.jpg
20190903_151755.jpg
20190903_151812.jpg

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Cliff Evans
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Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Cliff Evans » 03 Sep 2019, 07:46

Looks great Jilles. Looking forward to the flight.

Jilles
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Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Jilles » 07 Sep 2019, 02:52

Spray painted the top of the fuselage white, had an extensive masking exercise and sprayed the bottom red.
The masking was done three days after spraying the white otherwise the masking tape may pull the fresh white paint off.
Got some 6 mm wide black pin stripe tape to trim the joint line between red and white. I had 4 mm in mind but it comes in 3 or 6 mm so used 6 mm.
For the size of the model in the end it worked out better then 4 mm.
The color scheme is close to the original as it flew in the early seventies. The name Short Nimbus was painted on in the 1950's and not on the later paint job but I liked it, so used for the later version. Saves questions at the field what the model actually is.
Got some stickers made by my local supplier and the result is on the attached pictures
The last things to do are now fitting the main and tail skid, wheel and rudder. Then installing the electronic gear and do a final balance
Maiden flight is scheduled for the 28th of September.
Attachments
F09.jpg
masked for red paint
F10.jpg
F11.jpg
F12.jpg
F13.jpg
F14.jpg
F15.jpg

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Cliff Evans
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Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Cliff Evans » 07 Sep 2019, 07:44

WOW! As usual Jilles superb!!!!

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VinceC
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Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by VinceC » 07 Sep 2019, 08:13

Beautiful Jilles. What a remarkable transformation

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Peter Balcombe
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Location: Clevedon, North Somerset, U.K.

Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Peter Balcombe » 07 Sep 2019, 13:59

Very nice work as usual Jilles.

Sean Fitzgibbon
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Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Sean Fitzgibbon » 07 Sep 2019, 18:44

Superb project, impressive in every aspect!

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