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Penrose Pegasus

Let us all watch your new project progress.
AdamChambers
Posts: 23
Joined: 09 Jun 2023, 17:50
Location: Southampton

Re: Penrose Pegasus

Post by AdamChambers »

Well many apologies for such a long delay in updating this build.

Life threw me a massive curve ball and everything took a back seat .

The penrose is finished awaiting a decent easterly for its maiden. Cant say I remotely enjoyed building the wing tips which are fragile up until the last glue joint is made on the sheeting. I used 1/64 ply and learnt a lot about how to use it covering the tapered wings. I soak it for 24 hours and let it dry on the wing before trimming and gluing. A very slow process.

I have since spoken to Barry A who resides on here and he cleverly went with 1/16 balsa on his, covering with oratex and doing a faux wood effect painting which would have worked a lot better.

No airbrakes at all but given its a wardbrobe of a fuselage and undercambered , I doubt it will require much to slow he to landing pace.

Wing centre remains attached to the fuselage. BQ pine profile section to struts with soft steel tabs inserted. Wing tip is held up and in place with a simple steel tang, the plan shows a steel staple . The join is then taped with a 3/8th strip of covered ply and then blenderm. Diacov and water based varnish to seal the wood stain and covering.

AUW is about 5kg, and required 100g lead , not forgetting the electrics up front.
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Cliff Evans
Posts: 1029
Joined: 29 Dec 2019, 15:13
Location: Bristol
Contact:

Re: Penrose Pegasus

Post by Cliff Evans »

Very nice!
https://lasercutsailplanes.co.uk
https://patteaklegliders.co.uk
AdamChambers
Posts: 23
Joined: 09 Jun 2023, 17:50
Location: Southampton

Re: Penrose Pegasus

Post by AdamChambers »

Well she flies and boy does she fly well.

With the visuual appearance of a wardrobe , I expected a barge of a model but instead she is incredibly nimble and aerobatic, yes aerobatic.

I can fly in 8 mph up to 15 mph and she is a real pleasure to fly, thermals very well and cruises all day without fuss. Landings are a bit more involved as there are no airbrakes or flaps but you learn to scrub speed off on approach and slide her along. I may add up ailerons .

My 3 cell set up for power is perfect. One lazy evening flight had me reaching for the motor and she arose at 45 degrees at half power. I reckon im on 40-50w/lb.
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Cliff Evans
Posts: 1029
Joined: 29 Dec 2019, 15:13
Location: Bristol
Contact:

Re: Penrose Pegasus

Post by Cliff Evans »

Well done Adam.
https://lasercutsailplanes.co.uk
https://patteaklegliders.co.uk
Mike F
Posts: 112
Joined: 18 Mar 2015, 14:08
Location: Gloucestershire

Re: Penrose Pegasus

Post by Mike F »

Sounds perfect. Well done Alan!
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