Yamaha RX1 Engines

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Posted

Larry,  Whose box is that?  What is price?  EDMO

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Posted

I think it's going to need a bit of weight in the tail.....:lmao:JImChuk

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Posted

Larry,  Whose box is that?  What is price?  EDMO

Yeah!!

Is that Teal in the background?

Guess he never did show the scale of his new project in the CAD renderings...

WOW!

:lmao:

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Posted

That 'box goes along with you guys looking for more and more horsepower from your 2-strokes...

 

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Posted (edited)

That 'box goes along with you guys looking for more and more horsepower from your 2-strokes...

 

 

 

I installed a pair of quad turbo 16V149s running 750KW emergency power generators at O'Connor Hospital in San Jose in about 1978 if memory serves.  Both units were on skids and designed with "point of connection" terminals for control and output on the units.  Others piped fuel and coolant to the skids.  Transfer switches were located remotely in the basement of the hospital.  As I recall, it took about a year, start to finish to set them and hook everything up. It was a good job. They made lots of noise when fired up. 

Edited by Emory Bored

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Posted (edited)

Maybe we should start thinking about mid-engines, Like Ferrari, Catalina?  EDMO 

Edited by EDMO

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Posted (edited)

Maybe we should start thinking about mid-engines, Like Ferrari, Catalina?  EDMO 

P39...

image.thumb.jpeg.fd279d9ce81dc10b38ee4d1

Edited by Av8r3400
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Posted

yeah, cause it worked out so good for the cobra... they are splattered all over this state..

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Posted

Wine me, Dine me, 

Flat-spin P-39, me...

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Posted (edited)

Wine me, Dine me, 

Flat-spin P-39, me...

Somebody screwed up on figuring CG!  Should have had heavier nose, or other changes.  Bet Dean Wilson could have made a flyer out of it.  ;<)  EDMO

Edited by EDMO

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Posted

The big issue was snapping off the prop shafts up here.  Something to do with cold and bearing failures if I recall right.

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Posted (edited)

I've always wondered about the delivery motives on those aircraft.  If I ran the effort to equip Stalin with some airplanes it would make sense to me first to send all my very best pilots into combat in Europe and the Pacific.  Then, wanting to save as much money and time as possible I would build a string of airports at distances apart from each other that closely aligned with the range of the aircraft being ferried to Russia, then I would take those pilots that weren't especially fit for combat and put them in the cockpits of airplanes that I didn't particularly want and send them to their dooms over the top.  I imagine that that scenario is probably a factor; not the factor. 

A careful read of any one of dozens of histories of command decisions during WWII will suggest a peculiar cold efficiency to their methods.  Also, all of those airplanes were widow makers.  The only ones the pilots (several of whom I knew personally) really liked were the P-51 and the F-6.  Corsairs, P-40s and many others were horrible beasts. The P-38 early was a death trap until they figured out counter rotating props to eliminate the critical engine.

Edited by Emory Bored

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Posted (edited)

I've always wondered about the delivery motives on those aircraft.  If I ran the effort to equip Stalin with some airplanes it would make sense to me first to send all my very best pilots into combat in Europe and the Pacific.  Then, wanting to save as much money and time as possible I would build a string of airports at distances apart from each other that closely aligned with the range of the aircraft being ferried to Russia, then I would take those pilots that weren't especially fit for combat and put them in the cockpits of airplanes that I didn't particularly want and send them to their dooms over the top.  I imagine that that scenario is probably a factor; not the factor. 

A careful read of any one of dozens of histories of command decisions during WWII will suggest a peculiar cold efficiency to their methods.  Also, all of those airplanes were widow makers.  The only ones the pilots (several of whom I knew personally) really liked were the P-51 and the F-6.  Corsairs, P-40s and many others were horrible beasts. The P-38 early was a death trap until they figured out counter rotating props to eliminate the critical engine.

I was in the Army with a WW2 P38 pilot - He said that there was so little heat in the cockpit that he would wrap a sheepskin flying jacket around his feet and they still froze.  EDMO

Edited by EDMO

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Posted (edited)

I've always wondered about the delivery motives on those aircraft.  If I ran the effort to equip Stalin with some airplanes it would make sense to me first to send all my very best pilots into combat in Europe and the Pacific.  Then, wanting to save as much money and time as possible I would build a string of airports at distances apart from each other that closely aligned with the range of the aircraft being ferried to Russia, then I would take those pilots that weren't especially fit for combat and put them in the cockpits of airplanes that I didn't particularly want and send them to their dooms over the top.  I imagine that that scenario is probably a factor; not the factor. 

A careful read of any one of dozens of histories of command decisions during WWII will suggest a peculiar cold efficiency to their methods.  Also, all of those airplanes were widow makers.  The only ones the pilots (several of whom I knew personally) really liked were the P-51 and the F-6.  Corsairs, P-40s and many others were horrible beasts. The P-38 early was a death trap until they figured out counter rotating props to eliminate the critical engine.

I was in the Army with a WW2 P38 pilot - He said that there was so little heat in the cockpit that he would wrap a sheepskin flying jacket around his feet and they still froze.  EDMO

the poor Russian pilots must have had a hard time on long flights Ed

Hey is the avid fox p39 forum:)

Edited by Dusty

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Posted (edited)

I've always wondered about the delivery motives on those aircraft.  If I ran the effort to equip Stalin with some airplanes it would make sense to me first to send all my very best pilots into combat in Europe and the Pacific.  Then, wanting to save as much money and time as possible I would build a string of airports at distances apart from each other that closely aligned with the range of the aircraft being ferried to Russia, then I would take those pilots that weren't especially fit for combat and put them in the cockpits of airplanes that I didn't particularly want and send them to their dooms over the top.  I imagine that that scenario is probably a factor; not the factor. 

A careful read of any one of dozens of histories of command decisions during WWII will suggest a peculiar cold efficiency to their methods.  Also, all of those airplanes were widow makers.  The only ones the pilots (several of whom I knew personally) really liked were the P-51 and the F-6.  Corsairs, P-40s and many others were horrible beasts. The P-38 early was a death trap until they figured out counter rotating props to eliminate the critical engine.

I was in the Army with a WW2 P38 pilot - He said that there was so little heat in the cockpit that he would wrap a sheepskin flying jacket around his feet and they still froze.  EDMO

the poor Russian pilots must have had a hard time on long flights Ed

Hey is the avid fox p39 forum:)

Rusty,  You should know by now that we commonly jump off subject to get some flying history or airplane facts printed - Sometimes when you see others' mistakes it keeps you from repeating them.   I really enjoyed the Ercoupe with JATO video that someone threw into another thread.   I'm sure the SnoGo engine thread will continue soon.  EDMO

Edited by EDMO

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Posted

I was in the Army with a WW2 P38 pilot - He said that there was so little heat in the cockpit that he would wrap a sheepskin flying jacket around his feet and they still froze.  EDMO

I watch alot of those old war stories on tv and see how rough it was  Really makes me respect what you men did for us. You had to be one tough SOB to fight back then.

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Posted (edited)

I was in the Army with a WW2 P38 pilot - He said that there was so little heat in the cockpit that he would wrap a sheepskin flying jacket around his feet and they still froze.  EDMO

I watch alot of those old war stories on tv and see how rough it was  Really makes me respect what you men did for us. You had to be one tough SOB to fight back then.

Most had no choice - It was either do or die, and a lot of them died trying to protect others.  Vets are tough "SOBs"!    Fuck the rich spoiled NFL players who wont even stand for them and our National Anthem - No football on my TV, and I wont spend a nickel on their jackets and caps!   I have a lot more respect for the slaves and others who fought to free America and to keep it free than I have for those ungrateful bastards!  

(My wife says that I am a gentle sweet person until someone kicks a Vet, then "All Hell is coming out"!).   

Guess I wasn't through with my rant - I wanted to say, "Fans" of those money-players think the players are doing this for them, but all they are playing the game for is MONEY!   EDMO

 

Edited by EDMO
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Posted

Being a Vet. Myself I appreciate that and feel the same for my Vet. Brothers and Sisters. 

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Posted

I've always wondered about the delivery motives on those aircraft.  If I ran the effort to equip Stalin with some airplanes it would make sense to me first to send all my very best pilots into combat in Europe and the Pacific.  Then, wanting to save as much money and time as possible I would build a string of airports at distances apart from each other that closely aligned with the range of the aircraft being ferried to Russia, then I would take those pilots that weren't especially fit for combat and put them in the cockpits of airplanes that I didn't particularly want and send them to their dooms over the top.  I imagine that that scenario is probably a factor; not the factor. 

A careful read of any one of dozens of histories of command decisions during WWII will suggest a peculiar cold efficiency to their methods.  Also, all of those airplanes were widow makers.  The only ones the pilots (several of whom I knew personally) really liked were the P-51 and the F-6.  Corsairs, P-40s and many others were horrible beasts. The P-38 early was a death trap until they figured out counter rotating props to eliminate the critical engine.

I was in the Army with a WW2 P38 pilot - He said that there was so little heat in the cockpit that he would wrap a sheepskin flying jacket around his feet and they still froze.  EDMO

the poor Russian pilots must have had a hard time on long flights Ed

Hey is the avid fox p39 forum:)

Nah, for those Russian pilots ANY heat was like a nice sunny day at the beach.

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Posted (edited)

I was in the Army with a WW2 P38 pilot - He said that there was so little heat in the cockpit that he would wrap a sheepskin flying jacket around his feet and they still froze.  EDMO

I watch alot of those old war stories on tv and see how rough it was  Really makes me respect what you men did for us. You had to be one tough SOB to fight back then.

Most had no choice - It was either do or die, and a lot of them died trying to protect others.  Vets are tough "SOBs"!    Fuck the rich spoiled NFL players who wont even stand for them and our National Anthem - No football on my TV, and I wont spend a nickel on their jackets and caps!   I have a lot more respect for the slaves and others who fought to free America and to keep it free than I have for those ungrateful bastards!  

(My wife says that I am a gentle sweet person until someone kicks a Vet, then "All Hell is coming out"!).   

Guess I wasn't through with my rant - I wanted to say, "Fans" of those money-players think the players are doing this for them, but all they are playing the game for is MONEY!   EDMO

 

Now I am finished!   I'm going to have a nice day without watching any "games".   ;<)   EDMO

Edited by EDMO
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Posted

You missed a wild ending to the Vikings game..... They make me so mad, I don't know why I cheer for them.... JImChuk:wacko:

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Posted (edited)

You missed a wild ending to the Vikings game..... They make me so mad, I don't know why I cheer for them.... JImChuk:wacko:

I didn't know that Norway played ball?   Their fast invasion boats were pretty cool.   ;<)  EDMO

Edited by EDMO
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Posted (edited)

Ok guys, finally got to that rx-1 test running with 1 (and 2) of the 4 cylinders down:

Yamaha RX-1 Performance Test on 3 cylinders:

Ok, so part of my decision to go yamaha was that (since it does not have dual ignition) it would perform adequately on 3 cylinders if one were lost to a bad coil, spark plug,  carb blockage, stuck/burned valve, etc.

So I put the theory to test out on the snow today by pulling a coil lead off a cylinder.

Results were better than I expected,  with an easily started motor, good idle, and an estimated 80 hp output.

Details of test:  (All speeds are off the snowmobiles "dreamometer", which are accurate in comparison to one another, but all read high by approx 8%). 

2005 Yamaha RX-1, 30 deg F day (heat wave here in MN!) through 2" of loosely packed snow.  Top speed 78 mph with the #2 cyl coil unplugged.

That compared to a MUCH lighter 2012 Ski Doo 600 ACE (60 hp 4 stroke).  Top speed 64 mph.

For the 100 lb heavier RX1 to go 14 mph faster than the  ski doo in loose snow would probably take between 15 to 25 more HP.  (Note that a lighter 90 hp ski doo I ride occasionally would have gone about 85 mph in those conditions) 

So I am happy in those results.  The engine sounded and ran surprisingly well!  And 80 hp would be plenty to fully operate my kitfox 5 which was designed to use an 80hp rotax 912 as the normal powerplant.

Conclusion IMO is that dual ign is great, and would be preferred.... but it does only cover ignition redundancy.  I prefer the yamaha (with it's extra power reserve) which could carry the day very well with ANY failure of power output from a single cylinder.

 

Running on 2 cylinders test:

Test results running on 2 cyls (#2 and #3 coils unplugged):

I'm really surprised by this one,  started right up, idled fine on the all cyl idle stop, ran 53 MPH down the trail!!

That's gotta be 50 HP!

I was guessing it would have done less, but that would keep me in a gentle drift down in the plane... giving 10 times the options and time for a emergency landing.

Really happy to see it perform like that!

Edited by Yamma-Fox
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Posted

And hey Leni,  you're a sled guy too.

Can you look over my estimations here and give your opinion on their accuracy?  Thanks

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Posted

You guys got me sooo fired up about this motor, when I went through this thread, a couple months back.

Since then, I have been checking on sleds to buy...and all the components needed for such an undertaking.

I emailed Steve and he wants $2300 for his headers and says he has 5hrs on the Apex motor. I still think the

RX1 and carbs are a better choice (for me)...I can work on carbs.

I worked many years as a millwright, and can build most anything...given enough time and money..:P

So, I plan to build the motor mt and exhaust...possibly air box. But, anything can change at any time...

I guess, what I am really doing... is rambling on... trying to keep this thread going...trying to inspire..

Love all your work...postings etc..   Just...  GIVE ME MORE...

I realize that I am 2 years out...from the initial hype. That's right...don't follow me in the stock market...John O

 

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