Former .15 quarter midget engine quesiton  
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Former .15 quarter midget engine quesiton - 2/16/2008 3:53:18 AM   
fizzwater2


 

Posts: 741
Joined: 8/16/2004
From: Paola, KS, USA
Status: offline 		It seems the mounting screws that hold the exhaust adapter (mini-pipe adapter) to the rear of the Nelson .15 quarter midget engine are #3 screws - does anyone recall if they're 3x56's or if they're 3-48's? I'm missing the two screws to mount the adapter on an engine.

Also, might anyone have a venturi, mini-pipe, and pipe adapter for a Cox conquest .15 engine? For the life of me, I can't find my old stock conquest .15. I've purchased an RC version, plan on removing the carb, and installing the venturi and mini-pipe.

We have a couple of guys around here that are thinking of digging up old QM 15 planes just for some fun this summer, and I'd like to get the conquest running.

Last question - i'm half-heartedly working on a "collection" of QM15 engines. I have the Rossi, Nelson, Ron Young modified conquest, stock conquest (soon), K&B RIRE .15, working on a Supertigre G15, and someday hope to find a nice Taipan .15. Any others I'm missing? Oh - I've got an HGK 15, also.

thanks,



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RE: Former .15 quarter midget engine quesiton - 2/20/2008 12:06:15 AM   
fizzwater2


 

Posts: 741
Joined: 8/16/2004
From: Paola, KS, USA
Status: offline 		OK - i've check 3-56's, since I had some available. They aren't the right thread pitch, so it looks like 3-48 is the proper choice, but from the looks of this thread, not too many folks are concerned about old QM15 engines!



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RE: Former .15 quarter midget engine quesiton - 2/20/2008 1:11:25 AM   
daven



Posts: 6764
Joined: 12/7/2001
From: Andover, MN, USA
Status: offline 		They are neat engines, but rarely used anymore. They were designed for a specific application, and now that it doesn't exist anymore, unless you have some sentimentality its all but dead.

I have a couple cox motors that I still run occasionally, and if I get some time, I'll finish my mini seeker / Nelson .15 project

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RE: Former .15 quarter midget engine quesiton - 2/20/2008 2:46:03 AM   
fizzwater2


 

Posts: 741
Joined: 8/16/2004
From: Paola, KS, USA
Status: offline 		How many sq in are you making your mini-seeker? I had a "quickee 300" that was scratch built several years back, with an OS .25 FSR. Went like stink with a 7/7 prop on it..

But, I think a Nelson .15 or even a Conquest .15 on one would be pretty quick.

The reason I"m digging out the Q15 engines, we've got two or three guys around that are digging out old planes or even putting together old kits just to fly for the fun of it sometime this summer. I have no delusions of the event coming back, but it'll be fun to fire one up again for old time's sake.

You'll have to shoot a pic of that mini-seeker when you get it whipped out!



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RE: Former .15 quarter midget engine quesiton - 2/20/2008 12:01:59 PM   
daven



Posts: 6764
Joined: 12/7/2001
From: Andover, MN, USA
Status: offline 		I have several other planes to finish before I get back onto this fun stuff.

Here are a couple pictures:

Its basically a 75% scale version of the Seeker . Wing will have a chord of roughly 7" and a 36" span.


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RE: Former .15 quarter midget engine quesiton - 2/20/2008 12:05:56 PM   
daven



Posts: 6764
Joined: 12/7/2001
From: Andover, MN, USA
Status: offline 		And if that doesn't work out, I've been hoarding this QM Gager Estralita kit. Bought it from a club member who found it in a garbage dumpster for $75, and the kit included a Cox .15 with mini pipe. Those mufflers are SO funny looking.

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RE: Former .15 quarter midget engine quesiton - 2/20/2008 2:31:37 PM   
HighPlains


 

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Joined: 3/2/2003
From: Over da rainbow, KS, USA
Status: offline 		Gordo,

That 300 would be underpowered with a .15 engine. I think an X-40 would be about right, since they are light (about 12 oz.)

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RE: Former .15 quarter midget engine quesiton - 2/20/2008 5:26:56 PM   
fizzwater2


 

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Status: offline 		Dave - if you ever tire of looking at that Estrallita kit, let me know. The Gager Estralitta was my first quarter midget. Neat little airplane..

And I've never seen a muffler like the one on your conquest in the picture. Mine all ran straight mini-pipes similar to the engine in your mini-seeker pics.

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RE: Former .15 quarter midget engine quesiton - 2/20/2008 5:28:18 PM   
fizzwater2


 

Posts: 741
Joined: 8/16/2004
From: Paola, KS, USA
Status: offline 		Don't forget your ear plugs....

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RE: Former .15 quarter midget engine quesiton - 2/20/2008 5:44:03 PM   
daven



Posts: 6764
Joined: 12/7/2001
From: Andover, MN, USA
Status: offline 		Don't think I'll be getting rid of the Estralita kit, but who knows. Too many projects right now.

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RE: Former .15 quarter midget engine quesiton - 2/21/2008 1:31:14 AM   
Dan Vincent


 

Posts: 915
Joined: 7/13/2003
From: Sanford, FL, USA
Status: offline 		Fizz,

I did a thread a while back on QM engines with pictues.

QM was the brainchild of Chet Cunningham of RCM and he kicked off the concept in a 1968 article, don't remember the month.

QM was supposed to take advantage of stock plain-bearing sport .15 engines such as the Fox and OS. They had to have a stock carb and they used the "Idle Rule" for a while which meant your plane could not move forward at idle and they were also supposed to land at idle.

Soon competitive types discovered the Supertigre G.20/15 RC was pretty hot and the penalty for not maintaing idle was nothing compared to the speed edge.

Then the Supertigre G.15 RC came along and quickly became the engine to have.

In 1972 K&B started to advertise their new RISE BB Schnurle series-72 but it wasn't available until early '73. It had great RPM and very high torque allowing use of a 7-6 prop while all the other engines were forced to use a 7-5.

Then around '74 Taipan introduced their schneurle ported FIRE goldhead .15. It put out good power, a little down on torque from the K&B and some complained about the internals not lasting.

In 1975, Bill McGraw from Tennessee mated Rossi .15 with a Perry carb and a whole new performance era was born. At that time the Rossi was going for $95.00 and since it wasn't fitted with the manufacturer's carb a huge flap arose with the outcome being any engine used in QM had to retail for no more than $59.95.

Around that time I asked John Brodbeck, president of K&B if he was planning to upgrade his Schneurle .15 to an ABC. FIRE type and he said no because he was in the process of making a hot .15 for another American manufacturer that would run with the Rossi. Little did I know he was talking about the Cox Conquest .15.

In 1976 the Conquest showed up and made an impact on QM.

Shamrock brought the gorgeous HGK .15 in for QM but poor piston fit never allowed it to show it's stuff. Shamrock also imported an OPS .15 but I never heard much about it,

Ron Young made ABC conversions to the Cox Conquest that were very competitive.

K&B took over the Conquest under their name and introduced a special QM engine with different porting.

The Nelson .15 showed up and everyone else went away.

Other than that, I don't remember much else about it.

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RE: Former .15 quarter midget engine quesiton - 2/21/2008 2:51:38 AM   
fizzwater2


 

Posts: 741
Joined: 8/16/2004
From: Paola, KS, USA
Status: offline 		Dan, thanks - that's a pretty good brief history.

I have:

Ron Young conquest .15
Nelson .15 w/12 mm crank
Nelson .15 w/15mm crank
K&B RIRE .15, w/perry carb, but I"m missing the rotating exhaust baffle and the link between the carb & the baffle.
Rossi .15 w/perry carb.
HGK 15 - pretty chunky and robust case, that's for sure.

On the way: Stock conquest .15 w/perry, need to find the .240 venturi and the mini pipe & adapter for it. I've got spraybar & needle valve in my parts stash.

Looks like I need a ST G15, and the Taipan .15 I missed a Taipan 15 NIB the other day on that auction site, by about a buck or so. Darn the luck.

Personally, I started flying QM with a stock conquest (gone missing, that's why I had to pick up another one) and then swapped to the Nelson shortly thereafter. I missed out on the early days with the idle requirement.

Thanks again,
Gordon

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RE: Former .15 quarter midget engine quesiton - 2/22/2008 3:55:51 AM   
Dan Vincent


 

Posts: 915
Joined: 7/13/2003
From: Sanford, FL, USA
Status: offline 		Gordon,

Here are my Supertigre G20/15 and G.15 engines. I'm trying to find a Supertigre carb for my G20 as they were also sold as an RC engine and used in QM. I tried the carb from my spare G.15 but it was too large in diameter.

Supertigres are a delight to handle and the have excellent compression which makes for a great feel.

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RE: Former .15 quarter midget engine quesiton - 2/22/2008 5:04:34 AM   
vertical grimmace


 

Posts: 1142
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From: ft collins , CO, USA
Status: offline 		I just sold an OPS .15 several months back. It was big and heavy. Never ran and decided to get rid of it. It was imported by Shamrock as well.

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