21 Jun 2025, 15:16 [ UTC - 5; DST ]
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Post subject: Re: C421 converted to single PT6  Posted: 05 Apr 2024, 02:32 |
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Joined: 06/17/14
Posts: 5908
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Location: KJYO
Aircraft: C-182, GA-7
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Username Protected wrote: Not to one up the "lookit muh twin itza tbm killer now" theme but lookit this real multi to SETP ...
I have ridden in this airplane after the conversion from the conversion That is cooler than a SETP 421 AND a Royal Turbine Duke combined! https://en.m.wikipedia.org/wiki/Pratt_%26_Whitney_T34
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Post subject: Re: C421 converted to single PT6 Posted: 05 Apr 2024, 09:11 |
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Joined: 04/24/10
Posts: 8901
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Username Protected wrote: Not to one up the "lookit muh twin itza tbm killer now" theme but lookit this real multi to SETP ...
I have ridden in this airplane after the conversion from the conversion I guess they found some confidence... Speaking of testbeds...remember that 727 with the unducted fan on one side?
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Post subject: Re: C421 converted to single PT6 Posted: 05 Apr 2024, 13:21 |
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Joined: 08/24/13
Posts: 9784
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Company: Aviation Tools / CCX
Location: KSMQ New Jersey
Aircraft: TBM700C2
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Username Protected wrote: https://www.youtube.com/watch?v=s0ZX69NvpN4 That 757 was a testbed for some of my equipment Honeywell was buying a few years ago. Never got to fly on it but did some ground testing at PHX.
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Post subject: Re: C421 converted to single PT6 Posted: 07 Apr 2024, 22:35 |
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Joined: 10/31/11
Posts: 1129
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Company: B777, 767, 757, 727, MD11, S80
Location: Colorado Springs
Aircraft: Thrush S2R, AC500B,
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Username Protected wrote: I guess then an Allison powered Bonanza is kinda silly too. Yep. Nuthin' dumber than a turbine Bo.
Anyone know the range allowing a 45 minute reserve?
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Post subject: Re: C421 converted to single PT6 Posted: 19 Nov 2024, 00:43 |
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Joined: 11/15/17
Posts: 1109
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Company: Cessna (retired)
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Username Protected wrote: Bill,
What was the power plant? I think you mentioned it in a previous thread but I can’t remember. I was previously told that it was a PT6 but that is obviously not the case. It was two small block Allison turboshafts with a custom made gearbox and custom made props.
There is a photo in the thread below (I couldn't get copy and paste to work)
https://www.beechtalk.com/forums/viewtopic.php?f=49&t=156177
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Post subject: Re: C421 converted to single PT6 Posted: 19 Nov 2024, 10:48 |
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Joined: 10/18/11
Posts: 1101
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Aircraft: Seabee Aerostar 700
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Username Protected wrote: you can go to Hayden Idaho (aerostaraircraft.com) and see it and perhaps have a ride. this is a very nice aircraft and was done by the airframe manufacturer. I have ridden in it and its performance is spectacular. last I heard all they needed was 25 million or so to put it into production. If you are going to turbines this is the way to do it. It is certified as I understand and the conversion can be done to existing Aerostars. they have the rights to build new ones if you want also. look at this flight in October https://www.flightaware.com/live/flight/N31TT
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Post subject: Re: C421 converted to single PT6 Posted: 19 Nov 2024, 21:25 |
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Joined: 12/18/07
Posts: 20943
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Location: W Michigan
Aircraft: Ex PA22, P28R, V35B
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Username Protected wrote: Nuthin' dumber than a turbine Bo.
-Kurt I thought that turbine whine on startup was a Chick magnet?
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Post subject: Re: C421 converted to single PT6 Posted: 19 Nov 2024, 23:54 |
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Joined: 01/02/08
Posts: 7813
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Company: Rusnak Auto Group
Location: Newport Coast, CA
Aircraft: Baron B55 N7123N
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Username Protected wrote: I thought that turbine whine on startup was a Chick magnet? My brother has a beautiful wife so he doesn’t need or want a chick magnet. But that turbine A36 sure draws a crowd on the ramp! I think the A36T is to singles what the 56TC is to twins. 2500 FPM gets your attention and adrenalin flowing right quick - takes a few minutes to wipe the grin off your face once you level off! 
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Post subject: Re: C421 converted to single PT6 Posted: 20 Nov 2024, 15:48 |
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Joined: 09/11/09
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Company: Middle of the country company
Location: Tulsa, Ok
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Oooh, that five bladed prop looks way better than the three blade, too.........
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Post subject: Re: C421 converted to single PT6 Posted: 20 Nov 2024, 20:15 |
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Joined: 11/15/17
Posts: 1109
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Company: Cessna (retired)
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Username Protected wrote: Nuthin' dumber than a turbine Bo.
-Kurt I thought that turbine whine on startup was a Chick magnet?
Reminds me of a joke:
Q: Do you know the difference between a turbine engine and an airline pilot?
A: The engine quits whining after shutdown.
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Post subject: Re: C421 converted to single PT6 Posted: 24 Nov 2024, 08:21 |
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Joined: 01/10/17
Posts: 2213
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Company: Skyhaven Airport Inc
Aircraft: various mid century
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I'd like to see a 1123 Jet commander or even early Citation with tractor PT6 on reconfigured rear pylons.
Part 25 airframe Sort of the same configuration as the Eviation Alice. But ice damage off the wings into the props would be an issue. How does the Piaggio handle this?
Or 350 king air with Citation wings outboard of the nacelles?
Actually would the Jet Kingair 200 revisited with modern engines work? Especially if mounted forward enough to make a blown flap configuration for short field?
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Post subject: Re: C421 converted to single PT6 Posted: 24 Nov 2024, 16:23 |
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Joined: 11/15/17
Posts: 1109
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Company: Cessna (retired)
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Username Protected wrote: I'd like to see a 1123 Jet commander or even early Citation with tractor PT6 on reconfigured rear pylons.
Part 25 airframe Sort of the same configuration as the Eviation Alice. But ice damage off the wings into the props would be an issue. How does the Piaggio handle this?
Or 350 king air with Citation wings outboard of the nacelles?
Actually would the Jet Kingair 200 revisited with modern engines work? Especially if mounted forward enough to make a blown flap configuration for short field? Problem with tractor configuration described is that longer pylons would be needed for prop to fuselage clearance, also probably noisier in the cabin. Solution to ice shed off the wings is to make the inboard wing section anti-icing (heated) instead of de-icing (boots).
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