PDA

View Full Version : Mi-17 Toppled on ground


NightStalker55
10th Feb 2023, 12:15
What possibilities are there (less Dynamic Rollover) where Mi-17 helicopter can topple on ground at full RPM ?

sandiego89
10th Feb 2023, 19:00
Several H-60s and a MH-53 were rolled over in a sudden thunderstorm in Norfolk, Virginia, USA recently. The MH-53 is sizable piece of machinery.

https://www.wavy.com/news/local-news/strong-thunderstorms-impact-hampton-roads-parts-of-obx-tuesday/

SATCOS WHIPPING BOY
10th Feb 2023, 20:10
By trying to hover-taxi whilst tethered in the manner of the Seaking at Boscombe some time ago.

sycamore
10th Feb 2023, 21:44
SWB..Got a reference/report for that...?

H Peacock
10th Feb 2023, 21:51
By trying to hover-taxi whilst tethered in the manner of the Seaking at Boscombe some time ago.

Ah, the TPs that tried to lift the full-size globe!!

Cornish Jack
11th Feb 2023, 09:15
Rusty memory, but I don't recall a deliberate attempt to taxy. We did 'have a moment' doing low speed power checks with the 'fifth wheel' Bedford lorry and Steve R's 'methods' experiment !

unmanned_droid
11th Feb 2023, 10:50
I should think the main possibilities are -

External forces such as weather (as already stated)
Poorly damped vehicle-ground interaction - perhaps a failed main landing gear shock strut could cause a divergent vibration condition at some critical rotor speed - I think low RPM would be critical - lower frequency higher amplitude
High payload weight poorly loaded perhaps again linked to a strut failure might create a high enough lean angle
Combinations of the above
Other things that I don't know about!

SATCOS WHIPPING BOY
13th Feb 2023, 00:08
SWB..Got a reference/report for that...?
brief report here: https://aviation-safety.net/wikibase/71524

HTH