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The HP VT21 4-stroke RC model plane engine
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- Опубліковано 17 кві 2010
- This is a 30 year-old 4-stroke engine which has an Aspin Rotary Valve in the head rather than more conventional poppet valves and camshaft.
These engines are very weak but also amazingly quiet.
The airframe is a very old design from the 1960s I think and it weighs a ton. Flying this engine/airframe combination requires a very light touch on the sticks because it'll stall in an instant if you attempt to slow it up or use just a fraction too much elevator.
Still, it makes a nice change from grossly overpowered trainers, 3D machines and pulsejet-powered RC models.
A friend of mine lives next to an R/C airfield. Last year, he found the shattered remains of an airplane in his yard, and the only thing salvageable was the engine - an early version (brass valve barrel) HP vt.21. He gave it to me, as he isn't really interested in R/C planes, and I'm going to scratch-build a Lazy Bee over the upcoming winter months, because it's the perfect airframe for this "oddball" engine. Thanks for the video!
The VT21 is known to be the most gutless 4 stroke. Yet here it performs admirably.
That sounds sweet as good flying too 😀👍
One of my favorite videos. Nice plane. I bought one of these engines. Still in it's box until I build anplane for it. Thanks for sharing.
It has a nice sound.
What take off's and landing's. Steerable nose gear or no that was Awesome!! Glad to see you kept the lead wind screen. Love watching you fly this no matter when you do it. 👍👍👍
excellent demonstration of the HP VT21 ENGINE ,, FUN TO FLY an old model all the best with it ,
I have the black head ballbering version off the HP VT yet to go in a model,
wow, just shows how far rc planes have come, especially in recent years
I wish our field saw this much action , great camera work :)
I love this Bruce.
Just bought a little .21 on ebay to put in a lightweight airframe.
Cheers.
This is one of my favorite vids from you. It looks to me that it is fun all out of proportion to its size, I like that!! You dont need a 1 to 1 power to weight ratio to fly.
Nice sound, sounds very realistic
Dang. I now feel older because my transmitter an long antenna.
Thanks for this video. Just got one of these engines and see many have issues and I have to wonder if the tank vent is best to atmosphere. I’ve done this with some old Saito engines and improved consistency with idle and high rpm.
Thanks again!
awesome video
Excelenter Motor und schönes Modell gut geflogen
Niice sounds almost like a full size plane
That's a fairly quick little bugger, with a dang little ,21 4 stroke.
sounds awesome
Very very nice!!!!
Nice plane
NIce old engine Bruce- it is quiet!
wow !!! love tht engine and love tht airplane !!!!
Love that sound. Think of the neat little models you could build around that one. Polk's has a 36" Tiger Moth. Also I'm thinking scratch-built monoplanes a lot like this one. A Corby Starlet, say, or a Jurca Tempete.
Magnum XL .30 RFS - Four Stroke / APC 8x9 / Saito .72 Muffler
Needle peak at 12,419 rpm /.51hp / 380w / 106 mph pitch speed
29oz / 1.82 lbs thrust / 30% nitro / 20% castor
Thinking about one of these in a half-scale (35 inch span) Taurus.
sounds .like a real plane
A real non electric four stroke internal combustion engine!
The real excitement begins... HERE!
PS xjet:
If you need full throttle to land... move just a tad of the weight forward aft.
Aircraft, like commecial airline aircraft have a 3 or more detent on the elevators to keep the nose down. However, for smaller RC aircraft the oposite would do better. The object is to balance speed vs climb.
If you need more rpm's to land its because your nose is too heavy.
But what do I know... I'm only a jet engine mechanic, airframe and balance was my room mate's proffession.
Bill Yost Hi Bill, I own two of these engines, the issue is that they don’t idle well below 5000 rpm, they just stop. Seems to be a design issue. That’s the reason of landing at high rev compared to normal rc engines. Cheers
Been after a .25 version for a while myself.
Seems the trick is castor oil only, no synthetic, fit only a standard short reach plug and prop them to rev out to two-stroke speeds. Can't get valve float at least!
These are available brand new in .21, .25, .49 and possibly .61 - and all the parts as well via MECOA
That sounds the part mate and if it works don't knock it i say ;-) thumbs up.
I agree flys pefect
Lovely little engine. Do you use ordinary glow fuel or does it require a different lubricant?
Arrrrrrr~
lol you sound exactly like my old PE teacher :D
Any chance you know the height of the complete engine, from the bottom of the crankcase to the top of the valve cover? Great little engines!
Where can I order a nice hat like he is wearing? Good info on the HP.
works for me...
can a plane fly with stirling engine
Tried to paste the link, oops. MECOA is the Model Engine Company Of America. They do K&B as well...
Hope the NZ model fun police are leaving you alone lately.
Cheers.
When did they stop making them? :)
do people have mx bikes in the background?
Hello.. i would like to know if it is possible to buy this engine?
www.mecoa.com/hp/vt/21.htm
www.ebay.com/itm/HP-VT-21-Four-Stroke-Rotary-Valve-/273170327062
Blaž Petrinčič I’m a subscriber to your channel. I’ll work a deal out with you. Take at look on eBay
If ya can hear me over the sound of the engine🙄🙄🙄🙄what is f1 motor ,, v8
@ElRhinoProductions whats the swearing all about.
Just thought I'd put my two penny worth in and say, why don't you use a restrictor tie down when starting up your engines because if the engine was set on full throttle by mistake it could easily run into your hand causing severe lacerations.
That is mandatory at our local flying club Phil.
Hi Paul, it's quite the opposite here at our club since a member started his engine mistakenly on full throttle and it lurched into his hand and the prop lacerated his fingers and taking the tip off one, but having said that we all know that this is a dangerous hobby and sometimes it can bite back.I will say that I do enjoy watching your video's and only wish our weather here in England was as great as yours.Re; Phil.
Yeah I thought it was a little scary watching that starting technique. I'm careful starting mine, the first thing they make you do when you get your solo wings at most RC clubs is a safety check to make sure you're doing it right. But 9/10 times the very same examiner does your check then goes straight back to dangerous techniques himself! I always use either a hold-back or a starting table, and walk around behind the model after starting, I really don't like the way most ppl reach over the spinning prop to remove the glow igniter. Maybe I'm a fuddy duddy about it but I'd rather be super careful and know there's nothing to go wrong.
High speed LOL
i like your videos. me and my dad just got a thunder tiger f 54 4 stroke and we are lost when it comes to tuning 4 strokes right now when we give it full throttle it goes up and then falls in rpm. i have looked everywhere for 4 stroke tuning videos and nothing. we are using a tach but we dont know what that means. thanks in advance Paul F paul9299(at)gmail(dot )com
One of my favorite videos. Nice plane. I bought one of these engines. Still in it's box until I build anplane for it. Thanks for sharing.