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planecrazzzy(at)yahoo.com Guest
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Posted: Wed Jan 04, 2006 3:10 pm Post subject: Engine comparison |
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Thank you Topher,
That was a GREAT comparison and explaination that "I" could understand ....
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donghe(at)one-eleven.net Guest
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Posted: Wed Jan 04, 2006 3:56 pm Post subject: Engine comparison |
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Ya Mike..
I knew Topher would be there when we needed him!
Thx Chris, you laid it out well, and as you said,,The Vtwins are not going
to be a replacement for a high performance 2 cycle..
They could be an alternative, but only on some airframes. Kinda like a Jabi
works Great on a Sonex...but not so good on a Kolb. For these engines to be
able to be utilized, the airframes will need to match em.
Alot of us flew alot of miles behind Solos and McCullochs, Sachs and even
West Bends and Chotia's in the early days. all with alot less horses!!
IN the quest for more power we all migrated to higher hp snowmobile engines.
Most of the market stopped searching when we got to these. We started to
tweak airframes to fit em better...and as previously mentioned, even design
them specifically. Now, we are paying the price in Dollars because we have
put all our eggs (well, most or them) in this basket and the people carrying
this basket saw that they had an opportunity to squeeze....and they are
obviously taking that opportunity.
I cannot say if a 103 legal bird could be developed with a 125 lb engine,
but these all have electric start, heavy flywheels and industrial
aircleaners that could be stripped to reduce weight...would they be light
enough then?....I think so...and I think with the experience that the
designers have today all it will take is for someone to decide to just do
it....
Quote: | From a strictly sales viewpoint....the benefits are obvious. Lower cost and
longer life,and more dependable. All by very large factors. |
Imagine what TNK would have to do to try and remove a third of the cost of
any of their birds!!...it would be impossible.
Dreamin Don
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flykolb(at)pa.net Guest
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Posted: Wed Jan 04, 2006 5:18 pm Post subject: Engine comparison |
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Don,
Yes, these out-of-the-box engines have a lot of sheet metal they don't need
and some have built in gas tanks which can be replaced by ligher plastic
ones. I would think they could shed quite a bit of weight. Plus the slower
crank speeds would make a reduction device easier to design and manufacture
because the ratio would not need to be a large one. Or a larger dia "fan"
with a suitable ratio could be turned relatively slowly and more
efficiently. It would not have the snap of the 2-strokes, but it would fly
credibly well.
The most refreshing thing in this direction I have ever seen was the "Hudson
Thing" by Sandy Hudson. He did have 2 "out-of the-box" briggs engines, one
on each side of the fusleage. I just couldn't get done looking at that
exercise in simplicty and economy and I just have never been able to get it
out of my mind.
Dennis
Quote: | I cannot say if a 103 legal bird could be developed with a 125 lb engine,
but these all have electric start, heavy flywheels and industrial
aircleaners that could be stripped to reduce weight...would they be light
enough then?....I think so...and I think with the experience that the
designers have today all it will take is for someone to decide to just do
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donghe(at)one-eleven.net Guest
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Posted: Wed Jan 04, 2006 8:17 pm Post subject: Engine comparison |
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Dennis/ and all interested/
If you have not seen this video...take a peek at it. The link is here on
Monte Graves Homepage.
This is the Smiths Legal Eagle with the 32 hp vtwin completely stock
including governor....flown this fall.
Of course...we dont know how much the whole thing weighs. 32 ft wing..32
horses
http://home.usmo.com/~mgraves/
Don
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