SHORT BROS NIMBUS SCALE 1:3.5

Let us all watch your new project progress.
Post Reply
Jilles
Posts: 168
Joined: 22 Mar 2015, 10:27
Location: Australia
Contact:

Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Jilles » 11 Sep 2019, 03:12

The Nimbus was taken to the field today to get rigging experience on the field and do a range test.
I have a 16 channel Taranis TX. Two 8 channel receivers are fitted. Two 3S-2200 Lipos for power supply with individual power supplies for redundancy.
Both elevator halves have their own servo and channel divided over the two RX's, an other redundancy measure. Same for the ailerons.
In total 10 channels are used. Also on board a high precision Vario/altimeter from Taranus.
All my vario's are programmed that they beep when flying in lift. In normal sink no sound is emitted. Only when experiencing excessive sink a constant low pitch tone is heard.
Apart from adding approximate 150-200 grams in the nose and coming up with some cover strips over the wing-fuselage joints all is ready to fly
These cover strips are shown on pictures of the prototype so will be to scale. Much better than tape that rips of the paint after a while
The flying weight will be 11.9 kg so just under my goal of 12 kg max.
Attached some pictures of the occasion today. For a change I am in one of the pictures to give an idea of size. It won't happen to again.
This concludes this built thread with only more thread to come after the 28th with either the good or bad news.
Attachments
20190911_090050.jpg
20190911_090116.jpg
20190911_090125.jpg
20190911_090138.jpg
20190911_090209.jpg

User avatar
Cliff Evans
Posts: 1761
Joined: 13 Mar 2015, 10:32
Location: Bristol
Contact:

Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Cliff Evans » 11 Sep 2019, 08:12

Looks great Jilles. As do you. Looking forward to the flight.

User avatar
VinceC
Site Admin
Posts: 669
Joined: 22 Feb 2015, 11:45
Contact:

Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by VinceC » 11 Sep 2019, 08:49

Wow! 8-) 8-) 8-)

patte de loup
Posts: 18
Joined: 18 Mar 2015, 21:11
Location: Strasbourg ( FRANCE )
Contact:

Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by patte de loup » 11 Sep 2019, 15:38

Ouah !!! congratulations for this homebuild.
Should be on the top with pilotes Inside ;)
Looking forward to seeing pics of her in the sky :)
Pat'

Jilles
Posts: 168
Joined: 22 Mar 2015, 10:27
Location: Australia
Contact:

Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Jilles » 28 Sep 2019, 07:45

Today was the maiden flight of the Nimbus. It was inspected by an MAAA inspector, what is here in Australia required for over 7 kg models. all was approved and signed off. Wind was light but in variable directions and a bit bumpy. The maiden flight went well with a model still in one piece after landing.
The tow was easy, but is went a bit out of hand after I thought it was released( see reason on end of this story). got control back and it flew hands free without any trim changes
The elevator was a bit sensitive but improved after switching to half rate. I think adding bit of differential would bring this under control.
I tried some slow flying and it tends to tip stall. This was expected so I switched on some reflex that i had already programmed in , both ailerons up by 2 mm, This improved things in the slow flying mode. I will use this in future during landings. Deploying the air brakes resulted in the nose going down a bit, this is what I prefer so that is no issue. The model did not show any vices so I am happy with the result and will sleep very well tonight.
When I inspected the tow loop it was broken. So I thought I had released but it did not, The reason for some free of charge aerobatics when it broke.
It seems that the release servo stalls under heavy load even with a 16kg/cm servo. For this reason a second flight was not performed, Need to get this right first. there are two video's on You tube not edited at this stage, ask for Nimbus glider maiden in the search engine or use the following links

https://youtu.be/Oc1W3pKkO_0

https://youtu.be/GyzRjSsNBUk

User avatar
Cliff Evans
Posts: 1761
Joined: 13 Mar 2015, 10:32
Location: Bristol
Contact:

Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Cliff Evans » 28 Sep 2019, 08:09

Congratulations Jilles. looks good in the air. Another success. Well done.

Sean Fitzgibbon
Posts: 76
Joined: 11 Oct 2017, 18:53
Location: Mitcheldean

Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Sean Fitzgibbon » 28 Sep 2019, 08:51

Congratulations!
I've followed this build with great interest, a challenging subject to say the least! Superb craftsmanship from design through construction and ultimately a fantastic maiden flight.

User avatar
Peter Balcombe
Posts: 921
Joined: 18 Mar 2015, 10:13
Location: Clevedon, North Somerset, U.K.

Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Peter Balcombe » 28 Sep 2019, 09:19

Very well done Jilles.
A lovely model & good to see a successful maiden flight.
What’s next? :)

Jilles
Posts: 168
Joined: 22 Mar 2015, 10:27
Location: Australia
Contact:

Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Jilles » 28 Sep 2019, 10:40

What is next, well I did start scale motor glider some three years ago but lost interest. Bullt an ASW15 and Nimbus instead. Now I did restart the motor glider. It is a German design called Krahe or Crow in English. Some details attached. It has a pusher prop in an open frame fuselage. the construction is done for say 70% It will be electric driven.
I did not start a build thread on this one and have not a complete drawing set ready for others to use. Could do this afterwards if there is any interest.
Working on a Computer design for Cliff Evans. It will have working Fowler flaps. Not sure if Cliff wants the model name to be broadcast at the moment so be patient.
Attachments
crow-1.pdf
computer model 3D view
(41.01 KiB) Downloaded 8 times
2235880061_3cb62021d2.jpg
sheim03_motorkraehe.jpg

User avatar
Barry_Cole
Posts: 1281
Joined: 10 Mar 2015, 09:30
Location: Hampshire UK

Re: SHORT BROS NIMBUS SCALE 1:3.5

Post by Barry_Cole » 28 Sep 2019, 12:17

I think someone was building a model like that motor glider, some years back.

Anyone remember who it was????

BC

Post Reply