Dynamic Soaring

[AS]

Ran across this link showing a RC glider being flown at 548mph (882km/h)! The video is dizzying to watch and one can barely follow the glider going through 120g turns. Would be cool if we could replicate this in a more survivable way for the pilot and glider. I know it has been done in the past but it hasn't really caught on.

Uli
'AS'

https://newatlas.com/aircraft/dynamic-soaring-speed-record-spencer-lisenby/?fbclid=IwAR2BMi71yqDna3HeeiiCLdNKVXN7yaFG_Ttt8Drj Pd1EwS9GFD9L0d7ow-w&sara_ecid=nl_upd_1jtzCCtmxpVo9GAZr2b4X8GquyeAc9&nlid=v2wrsmaf

[john firth]

On Monday, February 1, 2021 at 11:10:41 AM UTC-5, AS wrote:
> Ran across this link showing a RC glider being flown at 548mph (882km/h)! The video is dizzying to watch and one can barely follow the glider going through 120g turns. Would be cool if we could replicate this in a more survivable way for the pilot and glider. I know it has been done in the past but it hasn't really caught on.
>
> Uli
> 'AS'
>
> https://newatlas.com/aircraft/dynamic-soaring-speed-record-spencer-lisenby/?fbclid=IwAR2BMi71yqDna3HeeiiCLdNKVXN7yaFG_Ttt8Drj Pd1EwS9GFD9L0d7ow-w&sara_ecid=nl_upd_1jtzCCtmxpVo9GAZr2b4X8GquyeAc9&nlid=v2wrsmaf
120 G s! look at the aspect ratio ; take out the 1 and it could be real or a misprint. As for the speed claim,
based on a radar gun measurement, I will wait for the FAI to approve this claim.

John F

[Eric Greenwell[_4_]]

john firth wrote on 2/1/2021 9:24 AM:
> On Monday, February 1, 2021 at 11:10:41 AM UTC-5, AS wrote:
>> Ran across this link showing a RC glider being flown at 548mph (882km/h)! The video is dizzying to watch and one can barely follow the glider going through 120g turns. Would be cool if we could replicate this in a more survivable way for the pilot and glider. I know it has been done in the past but it hasn't really caught on.
>>
>> Uli
>> 'AS'
>>
>> https://newatlas.com/aircraft/dynamic-soaring-speed-record-spencer-lisenby/?fbclid=IwAR2BMi71yqDna3HeeiiCLdNKVXN7yaFG_Ttt8Drj Pd1EwS9GFD9L0d7ow-w&sara_ecid=nl_upd_1jtzCCtmxpVo9GAZr2b4X8GquyeAc9&nlid=v2wrsmaf
> 120 G s! look at the aspect ratio ; take out the 1 and it could be real or a misprint. As for the speed claim,
> based on a radar gun measurement, I will wait for the FAI to approve this claim.
>
> John F
>
My RC model glider friends tell me the wings are single panel, almost solid carbon fiber. It's
not a one-off, either, many similar gliders.

--
Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
- "A Guide to Self-Launching Sailplane Operation"
https://sites.google.com/site/motorgliders/publications/download-the-guide-1

[Mike Carris[_2_]]

On Monday, February 1, 2021 at 10:34:54 AM UTC-7, Eric Greenwell wrote:
> john firth wrote on 2/1/2021 9:24 AM:
> > On Monday, February 1, 2021 at 11:10:41 AM UTC-5, AS wrote:
> >> Ran across this link showing a RC glider being flown at 548mph (882km/h)! The video is dizzying to watch and one can barely follow the glider going through 120g turns. Would be cool if we could replicate this in a more survivable way for the pilot and glider. I know it has been done in the past but it hasn't really caught on.
> >>
> >> Uli
> >> 'AS'
> >>
> >> https://newatlas.com/aircraft/dynamic-soaring-speed-record-spencer-lisenby/?fbclid=IwAR2BMi71yqDna3HeeiiCLdNKVXN7yaFG_Ttt8Drj Pd1EwS9GFD9L0d7ow-w&sara_ecid=nl_upd_1jtzCCtmxpVo9GAZr2b4X8GquyeAc9&nlid=v2wrsmaf
> > 120 G s! look at the aspect ratio ; take out the 1 and it could be real or a misprint. As for the speed claim,
> > based on a radar gun measurement, I will wait for the FAI to approve this claim.
> >
> > John F
> >
> My RC model glider friends tell me the wings are single panel, almost solid carbon fiber. It's
> not a one-off, either, many similar gliders.
>
> --
> Eric Greenwell - Washington State, USA (change ".netto" to ".us" to email me)
> - "A Guide to Self-Launching Sailplane Operation"
> https://sites.google.com/site/motorgliders/publications/download-the-guide-1


Actually the wing skins are solid carbon with no core material and vary between 2 and 3 mm thick and are thicker at the tip to handle the turbulence.

[[email protected]]

The 120G figure is mostly correct. I say mostly because tye sensors used maxed out at 120G so it would have been more. Unbelievable but true!

Here’s a great video lecture of the guy behind this project. It is from 2017 when the record was “merely” 515mph or so. He is continually making progress and setting new records.

https://youtu.be/nv7-YM4wno8

[john firth]

On Wednesday, February 3, 2021 at 12:24:10 AM UTC-5, wrote:
> The 120G figure is mostly correct. I say mostly because tye sensors used maxed out at 120G so it would have been more. Unbelievable but true!
>
> Here’s a great video lecture of the guy behind this project. It is from 2017 when the record was “merely” 515mph or so. He is continually making progress and setting new records.
>
> https://youtu.be/nv7-YM4wno8
I withdraw my skeptical comm ents; after watching the video, I see that the design approach has been highly professional.
JMF