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-   Alternative Engines (https://vansairforce.net/community/forumdisplay.php?f=22)
-   -   RV9 200HP Yamaha Sidewinder (https://vansairforce.net/community/showthread.php?t=207338)

Teal 06-19-2022 02:18 PM
Quote:
Originally Posted by blaplante (Post 1614832)
Is the reduction drive from Yamaha? Is it designed for the thrust load?
The reduction drive is SkyTrax specifically desgned for this engine. Yes, designed for much more thrust than this.

Teal 06-19-2022 02:34 PM
Quote:
Originally Posted by Ironflight (Post 1614820)
Keep up the reports! I have flown other aircraft with the Yamaha engines, and have wondered when someone would try one on an RV….so it will be great to hear your experiences. As has been pointed out, watch those TAS Vne numbers….and have a blast!
The VNE numbers published by VANS are in indicated airspeeds. I am surprised that I am getting so many comments from current RV aircraft owners that are saying watch the TAS VNE numbers. I do appreciate the concern for my safety and helping me look out but I am aware of the 210 MPH indicated air speed VNE of the aircraft. The goal is to utilize high altitude thin air to achieve 210 plus MPH true airspeed but indicated airspeed will be less than than 180MPH. I conservatively drew a red line on my airspeed indicator at 180MPH. My last flight at 15kft I was indicating 161MPH but true air speed was a bit over 200.

Teal 06-19-2022 02:41 PM
Quote:
Originally Posted by DanH (Post 1614836)
Yes, "Nytro" gearbox

Teal 06-19-2022 02:44 PM
At current HP levels (205hp) at 2000MSL. I can achieve 194mph IAS at wot straight and level flight.

SPX 06-19-2022 02:44 PM
Quote:
Originally Posted by Teal (Post 1614841)
The VNE numbers published by VANS are in indicated airspeeds. I am surprised that I am getting so many comments from current RV aircraft owners that are saying watch the TAS VNE numbers. I do appreciate the concern for my safety and helping me look out but I am aware of the 210 MPH indicated air speed VNE of the aircraft. The goal is to utilize high altitude thin air to achieve 210 plus MPH true airspeed but indicated airspeed will be less than than 180MPH. I conservatively drew a red line on my airspeed indicator at 180MPH. My last flight at 15kft I was indicating 161MPH but true air speed was a bit over 200.
The Vne numbers provided by Vans are IAS or TAS, whichever is the most limiting

Teal 06-19-2022 02:47 PM
Quote:
Originally Posted by Dad's RV-10 (Post 1614806)
Your first Dropbox link is broken:

Attachment 27212

Attachment 27213

Attachment 27214
https://www.dropbox.com/s/oclb67lz8l...65905.jpg?dl=0

Teal 06-19-2022 02:56 PM
Quote:
Originally Posted by SPX (Post 1614844)
The Vne numbers provided by Vans are IAS or TAS, whichever is the most limiting
Please educate me.
Where is that published by VANS?
True airspeed can greatly differ from indicated airspeeds at higher altitudes where turbo aircraft air capable.

SPX 06-19-2022 03:01 PM
Quote:
Originally Posted by Teal (Post 1614847)
Please educate me.
Where is that published by VANS?
True airspeed can greatly differ from indicated airspeeds at higher altitudes where turbo aircraft air capable.
Page 3 directly mentioned Vne being TAS, but this entire PDF is applicable.
Sorry to be the one to give the bad news.

https://www.vansaircraft.com/wp-cont...1/hp_limts.pdf

SPX 06-19-2022 03:07 PM
Quote:
Originally Posted by Teal (Post 1614847)
Please educate me.
Where is that published by VANS?
True airspeed can greatly differ from indicated airspeeds at higher altitudes where turbo aircraft air capable.

You can also learn more in this thread: Vne: Indicated -v- True Airspeed

Quote:
True airspeed can greatly differ from indicated airspeeds at higher altitudes where turbo aircraft air capable.
And that is exactly why Vne is TAS based.

titanhank 06-19-2022 03:31 PM
I would love to see a low pass video of this engine. I bet she sounds wicked when wound up. Keep up the good work.


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