M75771

Funny story about Dennis & his OS 1.2SP powered "Coyote" original design F3A plane. Having seen others crash due to connecting the aileron leads backwards, Dennis created a "fool-proof" way to prevent cross connections. His method was to cut the aileron extension leads and solder a deans plug and socket into the lead; however they were installed reverse from each other for each wing. This meant the the leads from the Rx had one male and one female lead that matched with the appropriate servo lead.
On a relatively cold day I got to the field just as Dennis was packing up after test flying the latest version of the Coyote. However he had to show me how great it flew, so quickly reassembled the plane. Dennis cranked up the OS, I carried out and off he went. As soon as the plane cleared the ground it rotated left and began to climb out in knife edge. I hollered "great knife edge but what else will it do?" Then in a low voice low voice Dennis said "I don't have any ailerons!" He continued saying he was looking for a place to crash it softly. The field had a line of trees behind the flight line and now the plane had circled around, headed for the trees and lower than the trees. I hollered for him to gain altitude but he didn't and he hit right between two trees but still caught a wing tip on a limb. The the Miracle happened; then plane exited the trees flying straight and level. Dennis chopped the throttle, lowered the gear and landed on the runway with NO damage to the plane! What cause the problem? You guessed it, the "fool-proof" aileron connections; the Rx leads we're plugged together as we're the servo connection. The plane went on to fly in many contests and is still in Dennis's possession today.

Tbobflow

"Fool proof" indeed. I've come to realize that "fool resistant" is about the best you can achieve.

so what type of plane is worthy of an engine like this? Obviously one wouldn't screw it to a profile 3d machine.. Would have to be a plane with proper breeding

308jockey

Interesting story from M75771, I recall that if an engine was sent in for repair as I did on one occasion, the carb was indeed modified. I never had a case cracking problem and don't recall that from Ray who I saw quite often on the contest circuit at the time. I guess it never came up. There were several of us running this engine at the time and I think Chip Hyde ran it for a while. Chris Lakin was another. I don't really agree that the YS would out pull the OS though. Kind of as Ford/Chevy argument. I won't say YS engines are better or worse, only that to this day I can't make them run right and I have a 140DZ in a plane now. I just don't get that engine. Anyway, you have one of the coolest and most interesting pieces of design and engineering I've ever seen in modeling. Enjoy it whatever you do with it.

Rick H.

BTW, anyone know what became of Ray Meyer? He was getting heavy into full scale flying last time I saw him and that's been quite a while now.

M75771

Chip Hyde did use an SP, I saw him fly a Dr Jekyll PHD with one at the '95 F3A Team Trials in Muncie.
As to my YS power output, it was not "stock" as most of the 150 YS four strokes I worked on. I rebuilt many these engines from '94 to 2000 and then got out of the hobby. Kirk Gray and Lonnie Martin both used engines I reworked to win their respective classes at the '96 Nats. I still love YS engines. Last summer I got my old Prophesy with 1.4FZ back in the air. It weighs 10.5 lbs after being wrecked and repaired. Using 20/20 Byron's fuel and a 16 x 11 prop it has unlimited vertical. I recently picked up an "L" at a swap meet and will install it after "rebuilding".

DISCUS54

My Feedback: (211)

I think Naruke won the 1995 World Championship with an OS120SP in his Aurum. There were a lot of competitive 120 airframes in the late 90's (Dr. Jekyll, Topline, Opal, Rubin, Desafino, Mystic, USA Star, Summit, ect.) ...all good candidates for an OS 120SP if you can find them....check out Frequent flyer in the Classic Pattern forum..."...Making Molds of classic pattern..." he's got a few 120 airframes and a lot of 60 Ballistic airframes. Cool stuff

dogshome

Airframe? Apart from pattern, what about something like a Reno races Mustang, Bearcat or Pitts?

Tbobflow

Flame suit on, but putting it in a bipe is as eccentric as the engine...hmm.

Tbobflow

Discus54, I'll keep looking but I haven't found those planes yet.

308jockey

The Rubin is not too hard to find, it's what I used for many contests and I have my SP in another one of those now. I also used it in an Elan and Ray used his in a Desire 120. All three were perfect for that engine. Also flown it in a Fresh-Aire and a Typhoon 1000. Look around a little and you'll find all of these available. Used in a race plane? Why not?

Rick H.

DISCUS54

My Feedback: (211)

One will show up before long...might require some patience as this stuff can disappear for months at a time. I have a spare Finesse but its a builders kit and may be more of a project than you want.

Tbobflow

Yeah, not up for scratch building a plane at the moment, but thanks! What I meant to say was that I am not having any luck finding even pictures of the planes you mentioned, much less any for sale.

Is is a crazy idea to put this into a 60 mustang or a Extra 330 or something like that? Seems like that would be plenty of fun and easy to find plane. Obviously not quite the cool factor as a legit 1990's era pattern... but...

airraptor

My Feedback: (66)

I have been looking for a Reed falcon biplane for a long time. there was a guy on here that had two. He wanted 300 dollars for one kit which wasnt to bad but he would sell just one he wanted to sell both at the same time and wouldnt seperate lol. This biplane would be perfect for that engine. JUST WISH I HAD ONE....

308jockey

Actually I think it would be very cool in a Mustang. Not a 60 size though, much too big and heavy. If there is a 1.20 Mustang out there and I bet there is I think a blown four stroke would be just the ticket and would sound great on a low pass. Likewise something in a aerobatic mono or bipe would do well. Maybe a Goldberg Ultimate or something like it, a Pitts or Christen Eagle. Take a look at the QB series from Aeroworks. I have one of their Yak 54's in this size that would be perfect for that engine. I just run mine in pattern planes because I like flying them.

Rick H.

Tbobflow

60 size plane too small for the engine? Arent those warbird guys running YS115 on 40 size mustangs?

Bipe does sound cool, I'm not against that idea at all, but I can't do a kit, I dont have the time for it

airraptor

My Feedback: (66)

the sound of these from what i have on Youtube is the same as any other 4 stroke of this size.

yes we run YS115s on small warbirds. the WM 46 size planes are to me really 60 size as they are over 550 sq inches. Our rules state a minimum of 515 Sq inch for the YS 115. this on 50% nitro and the right prop puts these planes in the 170-180 mph range.

308jockey

The OS is heavier and longer with the blower on the back. I suspect on a 550 sq. inch airplane it will be nose heavy as hell. I could be wrong. I just like the sound of a 4 stroke on a scale plane and I think a Mustang hauling by with that engine at about 10k rpm would be very cool. Actually if you run the stock muffler (and can get it to stay on) or just the header pipe it's pretty nasty sounding. Airraptor I'm curious, how long does one of those engines last running them that way?

Rick H.

Tbobflow

What about putting it in something with a little more wing, like 700-900sqin or so, let the plane slow down to say 100mph or so. Get a little more wingspan and it's easier to see with my old eyes

I like the idea of a mustang or a biplane.

DISCUS54

My Feedback: (211)

A couple of pattern airplanes...

DISCUS54

My Feedback: (211)

....and a Rubin.

dogshome

airraptor

My Feedback: (66)

The YS engines last a long time at those power levels. Some guys run 65-70 in their engines. The YS115 Warbird Special is more tolerant to the high nitro over the Regular 115S. For props the 115WS will spin a 14.5x14.5 at 9,800 on 50% nitro and 20% oil. That my folks is a bunch of power. The thing with most engines is RPM. most of us spin ours to around 12,000 in the air and just fine. can spin them more but at the cost of the ring and valves. just replace the ring once a season if running very hard and fast.

My little YS70 wil spin a 11x14APC at 11,100 on 50% I spin this engine around 12 to 12,500 on the ground with a clipped 11x13 prop and its also very fast on a plane that is 4.25 lbs.

oh and for the guy that likes the sound of a OS at 10,000 hasnt ever heard a YS come screaming by at 11,000 burning 50% nitro. the bark is just plain awesome.

Tbobflow

What do you have that YS70 in airraptor?

Tbobflow

And thanks for the pictures guys, that helps me get an idea!

airraptor

My Feedback: (66)

I have it in a little version of my Tsunami. 401 square inch wing. I ran a 1:26.1 in redding with it. I was running long on the course also. in redding its very hard to break out and i think we only had three break outs the whole time. this one is a bit heavy at 4.75 pounds but has been thru a few crashes. learning issues on my side with this kind of power. Its the little engine that can lol

airraptor

My Feedback: (66)

here is my Silver class racer. YS 91 on 35%. runs about 130-140 on the course. see how low I fly on the course. this year plan to race lower. need some weeds on the wing.