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Re: SHORT BROS NIMBUS SCALE 1:3.5

Posted: 11 Sep 2019, 15:38
by patte de loup
Ouah !!! congratulations for this homebuild.
Should be on the top with pilotes Inside ;)
Looking forward to seeing pics of her in the sky :)
Pat'

Re: SHORT BROS NIMBUS SCALE 1:3.5

Posted: 28 Sep 2019, 07:45
by Jilles
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




Re: SHORT BROS NIMBUS SCALE 1:3.5

Posted: 28 Sep 2019, 08:51
by Sean Fitzgibbon
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.

Re: SHORT BROS NIMBUS SCALE 1:3.5

Posted: 28 Sep 2019, 09:19
by Peter Balcombe
Very well done Jilles.
A lovely model & good to see a successful maiden flight.
What’s next? :)

Re: SHORT BROS NIMBUS SCALE 1:3.5

Posted: 28 Sep 2019, 10:40
by Jilles
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.

Re: SHORT BROS NIMBUS SCALE 1:3.5

Posted: 28 Sep 2019, 12:17
by Barry_Cole
I think someone was building a model like that motor glider, some years back.

Anyone remember who it was????

BC

Re: SHORT BROS NIMBUS SCALE 1:3.5

Posted: 28 Sep 2019, 15:55
by VinceC
Ian Davis has something similar