investigating Gear limit speed

[AeriaGloria]

   Hello I know the gear out limit speed is 160

kmh from various manuals and documentation. One publically available source is the Cold War Air Musuems Mi-24 user manual obtained for public use by FOIA, it is technically for Mi-24D but has addendums for differences to V/P models, and states gear limit speed as 86 KIAS. Which is 159.2 kmh indicated air speed. https://mudspikefiles.s3.dualstack.us-east-1.amazonaws.com/original/3X/7/a/7ab064a7f951b9f0325354f257f5e58c571936d6.pdf

    I have a feeling it’s on a list to eventually be modeled, but just putting it here since no one seems to have mentioned it before. Can’t wait to see all the surprise and stuck gears from people used to lowering or raising the gear at 260 kmh

[randomTOTEN]

I didn't know there was a gear speed until this post. Thanks!

[AeriaGloria]

6 hours ago, randomTOTEN said:

I didn't know there was a gear speed until this post. Thanks!

People go like “it’s a helicopter!” Or “later models had fixed gear!” But those later models didn’t have hydraulic retraction mechanisms, or gear doors that act as basically air brakes that hydraulics needs to open and close mid flight. 
 

In the manuals. It’s procedure to retract gear at 70-80 kmh, but you can’t accelerate at full speed from that speed and stay under 160 kmh by time gear is fully up, you have to be in considerable deep climb. It’ll add some management that many people don’t bother with. I know many people just decide to have gear down the entire flight, and this won’t effect them at all

[rcjonessnp175]

100 percent would like this

[randomTOTEN]

4 hours ago, AeriaGloria said:

I know many people just decide to have gear down the entire flight, and this won’t effect them at all

Is there even a VLE? My opinion is if it's got a VLO 160 KmIAS then that's what it's got, and that's what I'd like to have...

[AeriaGloria]

7 hours ago, randomTOTEN said:

Is there even a VLE? My opinion is if it's got a VLO 160 KmIAS then that's what it's got, and that's what I'd like to have...

Cold War air Musuem manual I referenced say “VLE, max speed gear extended.”

 

My export manual for Mi-35P says. “Landing gear extension and retraction is prohibited at speeds greater then 160 kmh.” 
 

One clearly referenced VLE, the other seems to reference VLO. Perhaps they are the same for this helicopter? 

Edited April 16, 2022 by AeriaGloria

[DeMonteur]

I would trust the export manual for Mi35P. It is prohibited to operate the gear over 160km/h but there is no limit for maximum speed when the gear is extended.

Edited April 6, 2023 by DeMonteur

[admiki]

On 4/16/2022 at 12:22 PM, AeriaGloria said:

My export manual for Mi-35P says. “Landing gear extension and retraction is prohibited at speeds greater then 160 kmh.” 

1 hour ago, DeMonteur said:

I would trust the export manual for Mi35P. It is prohibited to operate the gear over 160km/h but there is no limit for maximum speed when the gear is extended.

 

Isn't Mi-35 with fixed landing gear? Speed limit is gear well doors, not the gear itself

[DeMonteur]

10 hours ago, admiki said:

Isn't Mi-35 with fixed landing gear? Speed limit is gear well doors, not the gear itself

No. Mi-35 is just export marking of Mi-24V and it have retractable landing gear. Have plenty to see it RL in operation

About the speed limit: I heard something like this when 24 guys explaining me why gear operation is prohibited above 160km/h but it have been a while and it is not aircraft I fly...

Edited April 7, 2023 by DeMonteur

[AeriaGloria]

Mi-35: export Mi-24V

Mi-35P: export Mi-24P 

Mi-35M: 2006-2019 produced modernization 

Mi-35P Phoenix: 2019 replacement of Mi-35M and optional upgrade, with MAWS, original wing and retractable gear new AP and electronic systems. 

Edited April 6, 2023 by AeriaGloria

[admiki]

10 hours ago, DeMonteur said:

No. Mi-35 is just export marking of Mi-24V and it have retractable landing gear. Have plenty to see it RL in operation

About the speed limit: I heard something like this when 24 guys explaining me why gear operation is prohibited above 160km/h but it have been a while and it is not aircraft I fly...

 

7 hours ago, AeriaGloria said:

Mi-35: export Mi-24V

Mi-35P: export Mi-24P 

Mi-35M: 2006-2019 produced modernization 

Mi-35P Phoenix: 2019 replacement of Mi-35M and optional upgrade, with MAWS, original wing and retractable gear new AP and electronic systems. 

 

It's not that simple. Serbia bought 11 Mi-35P's from Cyprus, all of them fixed gear and short wing. AFAIK, wast majority of 35's are fixed gear.

[AeriaGloria]

7 minutes ago, admiki said:

It's not that simple. Serbia bought 11 Mi-35P's from Cyprus, all of them fixed gear and short wing. AFAIK, wast majority of 35's are fixed gear.

I wouldn’t say vast majority, it is hard to tell how many Mi-35M had been made. It and the Mi-35P operated by Cyprus/Serbia should be the only ones with fixed gear. I think 1,500 Mi-24V were made and over 600 24P. I believe anything outside the Warsaw Pact was given the 35 designation? 

[DeMonteur]

On 4/7/2023 at 8:46 AM, AeriaGloria said:

I wouldn’t say vast majority, it is hard to tell how many Mi-35M had been made. It and the Mi-35P operated by Cyprus/Serbia should be the only ones with fixed gear. I think 1,500 Mi-24V were made and over 600 24P. I believe anything outside the Warsaw Pact was given the 35 designation? 

That could be true. Czech republic had plenty of Mi-24D/DU and they get anoter bunch of Mi-24V designated as Mi-35 in 2005.

Russian designation system is pure chaoss but interesting to study.

Edited April 10, 2023 by DeMonteur