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larry(at)macsmachine.com
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 Posted: Sat Dec 29, 2007 2:08 pm Post subject: Trying an unproven engine - is it feasible, is it safe? |
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I don't think a degree will put you any closer to resolving the problems
of adapting a Yamaha. Examining "the numbers" needed to sustain power,
minimize engine rpms
and keep the prop engaged at the correct rpm at an appropriate total
weight would get you there if you're an "engine guy". I'd suspect this
one would be more appropriate
for a lighter aircraft. Super horsepower claims can be made for the
smallest engines, but most need excessive rpms and turbos to do any good
and they become very
thirsty in real operating conditions. The numbers are a shortcut that
anyone can sort thru if one takes the time well before spending precious
nickels.
I'm rather impressed with the Suzuki though. Nice application and
conversion. Better than a 912 in simplicity and much more economical.
Larry McFarland 601HDS at www.macsmachine.com
NYTerminat(at)aol.com wrote:
| Quote: | *Does that also apply to the Wright Brothers who were bicycle
mechanics???????????????*
In a message dated 12/29/2007 1:06:25 P.M. Eastern Standard Time,
wr.giacona(at)suddenlink.net writes:
wr.giacona(at)suddenlink.net <mailto:wr.giacona(at)suddenlink.net>
2."Would I be better off going with a more proven conversion like
the Suzuki/Geo or go with the 912?"
Statement 1 pretty much stands on it's own. There is no mention
that he has ANY experience with aircraft mechanics. He's not even
a pilot.
Statement 2 seems to show that he is just trying to come up with
an aircraft he can fly. I will be anyone here $100 that should the
original poster ever try to build a 701 or any plane with the
engine he described it will never get off the ground.
I'm hardly against conversion engines. But those that go about
designing such conversions need to either have at least some
experience with aircraft power plants or a real strong background
in engineering.
--------
W.R. "Gig" Giacona
601XL Under Construction
See my progress at www.peoamerica.net/N601WR
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=154875#154875
*
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bryanmmartin
Joined: 10 Jan 2006
Posts: 1018
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| Posted: Sat Dec 29, 2007 4:45 pm Post subject: Trying an unproven engine - is it feasible, is it safe? |
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Oh, I don't know. Orville and Wilbur seemed to manage well enough. 
It can be done but it does take a great deal of time and effort, to put
it mildly.
Gig Giacona wrote:
| Quote: |
I'm hardly against conversion engines. But those that go about designing such conversions need to either have at least some experience with aircraft power plants or a real strong background in engineering.
|
--
Bryan Martin
Zenith 601XL N61BM
Ram Subaru, Stratus redrive
Do Not Archive
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_________________
--
Bryan Martin
N61BM, CH 601 XL, Stratus Subaru.
do not archive. |
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lrm(at)skyhawg.com
Guest
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| Posted: Sun Dec 30, 2007 10:02 am Post subject: Trying an unproven engine - is it feasible, is it safe? |
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Before I got an offer I couldn't refuse on all my VW stuff, I looked real
hard at the Yamaha Genesis 150 engine. It's a 4 cyl fuel injected 150 hp
engine. Here was my thinking. I like 4 cylinders vs 3 because it would run
smoother. I've had enough recent experience with rough running engines to
last me a life time. I even got and studied the wiring diagrams and
concluded that it would be easy to convert. The only sensor I would have to
trick is the rollover one. The rest of them are O2, altitude, you need
them anyway. You really wouldn't have to trick the rollover sensor, just
don't bank or fly upside down. These little engines are designed to run at
altitude, no icing, no carbs. I really can't think of a better natural
conversion for an airplane. The 150 hp is very misleading. That's at
around 8,000+ rpm and you don't want to run that very long. Max should be
about 6 with a 2-1 or better re-drive. I'm guessing you would get around
100-110 hp. Building the PRSU shouldn't be a real challenge. Somebody
probably has already built one. The way the trans is set up it would be
lend itself to a belt drive quite well. I was going to cross that when I
got there. My plan was to buy a brand new snowmobile, they are about 10k.
Strip out the engine and wiring harness/sensors, sell the rest on E-Bay,
hopefully get a couple of grand.
Those are just my thoughts and 2 cents worth.
To me what I discussed above is what this "Experimental" is all about.
Too bad they don't have a "Fake Experimental" for some folks. Yep, I know
I'm a smart ass. LRM, www.skyhawg.com
---
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planecrazydld(at)yahoo.co
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| Posted: Tue Jan 01, 2008 6:52 am Post subject: Trying an unproven engine - is it feasible, is it safe? |
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just do not do the even number reduction ratio for starters...
LRM <lrm(at)skyhawg.com> wrote:[quote] --> Zenith-List message posted by: "LRM"
Before I got an offer I couldn't refuse on all my VW stuff, I looked real
hard at the Yamaha Genesis 150 engine. It's a 4 cyl fuel injected 150 hp
engine. Here was my thinking. I like 4 cylinders vs 3 because it would run
smoother. I've had enough recent experience with rough running engines to
last me a life time. I even got and studied the wiring diagrams and
concluded that it would be easy to convert. The only sensor I would have to
trick is the rollover one. The rest of them are O2, altitude, you need
them anyway. You really wouldn't have to trick the rollover sensor, just
don't bank or fly upside down. These little engines are designed to run at
altitude, no icing, no carbs. I really can't think of a better natural
conversion for an airplane. The 150 hp is very misleading. That's at
around 8,000+ rpm and you don't want to run that very long. Max should be
about 6 with a 2-1 or better re-drive. I'm guessing you would get around
100-110 hp. Building the PRSU shouldn't be a real challenge. Somebody
probably has already built one. The way the trans is set up it would be
lend itself to a belt drive quite well. I was going to cross that when I
got there. My plan was to buy a brand new snowmobile, they are about 10k.
Strip out the engine and wiring harness/sensors, sell the rest on E-Bay,
hopefully get a couple of grand.
Those are just my thoughts and 2 cents worth.
To me what I discussed above is what this "Experimental" is all about.
Too bad they don't have a "Fake Experimental" for some folks. Yep, I know
I'm a smart ass. LRM, www.skyhawg.com
---
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