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Dec 20, 2007, 09:07 PM
Trader Rating: 173
Twistaholic AMA 134406
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HP 21 VT Rotary valve 4-stroke classic

This is an Austrian made HP 21 four stroke with rotary valve technology. I have several of these in the 21 and 49 class and I love the way they run. This is an extra one I have so Im thinking of giving someone else the pleasure of ownership! Quiet as a mouse. No valves to adjust. I would rate this motor a 10 out of 10. A true collectable.

$125 shipped CONUS

Merry Christmas!
Last edited by Dad_Roman; Jun 17, 2008 at 03:45 PM.
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Dec 20, 2007, 09:19 PM
Trader Rating: 15
medium-sized Lewbowski
NIB or used? Bushing head or bearing head?

Last edited by Maybz; Dec 20, 2007 at 09:24 PM.
Dec 20, 2007, 09:40 PM
Trader Rating: 173
Twistaholic AMA 134406
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Not NIB, but you would be hard pressed to tell it has been run. I have bench run it back when I aquired it to ensure its function. Smalll amount of residue on the INSIDE of the muffler. Havent pulled it down to see if it has been updated so I am going to assume it is the original bushing head.

Thanks for the good questions
Dec 20, 2007, 09:52 PM
Trader Rating: 15
medium-sized Lewbowski
Thanks. That's a good price - especially for an original Austrian version. I'm seriously considering it.
Dec 20, 2007, 09:56 PM
Trader Rating: 173
Twistaholic AMA 134406
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I appreciate you sayin that. I got two of them for a decent price a while back and I can help pay it forward. I dont buy and sell like some, but I have tons of stuff I dont use and I need to fund a giant scale Meister Corsair.
Dec 23, 2007, 01:45 PM
Trader Rating: 96
Registered User
steveo64's Avatar

hp 21

what sort of prop would this turn? Could I use it in a plane that wanted a 25 two stroke?
Dec 23, 2007, 08:01 PM
Trader Rating: 173
Twistaholic AMA 134406
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VT 21
Break-in 8x4; 9x4
Normal models 8x4; 8x6; 9x4; 9x5
Speed models 8x7; 9x6

This is a 21 size. They seem to really like bigger props with less pitch so a 9x4 or a 10x4. I run a 12x4 on my 49 and it loves it. Flys my 4*40 great.

Owners manual available @

Thanks for lookin...Merry Christmas to everyone!
Dec 23, 2007, 11:47 PM
Trader Rating: 0
Registered User
PM sent.
Dec 23, 2007, 11:58 PM
Trader Rating: 173
Twistaholic AMA 134406
Dad_Roman's Avatar
PM Replied!

ATTENTION......In the first post I said I had several of these.....There is now ONE left available!

Dec 24, 2007, 12:33 AM
Trader Rating: 181
Blew out my flip flop
David Hogue's Avatar
I once flew a friends Sig J3 that had one of these .21's on it. I don't know what it weighed, but it handled and looked about like a real Cub with the whopping 40 HP they came with originally.

Good luck, and Merry Xmas!

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