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ProModeler Scorpion Power
allns47

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Richmond IN.

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What kind of setup is this never seen to fuel inlets...I bought this and got it today...

12-10-2016 09:26 PM
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allns47

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Richmond IN.

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Ok I goggles it....it's a pump setup....completely new to me

12-10-2016 09:43 PM
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allns47

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Richmond IN.

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I got a good deal on it

12-11-2016 06:21 AM
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slickporsche

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American/Philippines

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Rapter 90

Yes, that is a pumped engine in a very nice heli! Good purchase. I have been running pumped engines for years, and they work very well as long as you filter the fuel on the machine, and from the fuel jug. I noticed through the years, that people tend to mess with the pump too much and get it and the carb so far out of adjustment, they cannot get it back to normal.

I also ran many Perry Pumps and carbs with good results. The Perry Carb was and is very easily clogged with fine debris, so they need a good filter.

If when you run it, and it does not run to your expectations, check all the fuel lines for leaks. All! Start at the clunk line, and work forward. It is almost never the pump, unless it has some debris in it.

Have fun with the new purchase.

12-11-2016 02:31 PM
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ticedoff8

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Morgan Hill, CA. USA

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Two things:
I ran the OS .91HZ-PSS motor for about ten flights.
The pump failed on three of the flights and the engine goes lean. So lean that it burns the piston.
I rebuilt it twice and then threw it away after the 3rd time.
Be careful with the pumped motor

What is going on with the linkages?
Is that fuel tubing slipped over the link?
Or, is that some new material that I've never seen before?

Believe 1/2 of what you see and none of what you hear.
Fake News will be the downfall of our Republic!

12-11-2016 07:54 PM
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allns47

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Richmond IN.

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It's fuel tubing and heat shrink

12-13-2016 03:02 PM
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slickporsche

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American/Philippines

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RAPTOR 90 Raptor 90

If you look, there is a small one-way valve on the upper needle, which is the mid-range adjustment. It allows excess fuel to flow back to the t-fitting, then to the tank, or if needed, to the main needle.

12-14-2016 03:09 AM
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slickporsche

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American/Philippines

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RAPTOR 90 Raptor 90

That is very interesting idea with the fuel tubing and heat shrink on the pushrods. In coastal areas it would surely keep the rods from rusting. It is a huge problem in the Philippines. The salty air even causes corrosion on electronic switches on TX's.

12-14-2016 03:37 AM
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slickporsche

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American/Philippines

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RAPTOR 90 Raptor 90

The most important thing you can do with a pumped engine (YS included), is very good filtering of the fuel. Debris in the fuel is the major cause of problems with pumped engines. The system simply does not tolerate dirty or contaminated fuel with debris in it.

It is therefore imperative that you filter after the fuel pump from your fuel jug, to the fuel tank, a filtered clunk or line to the pump or engine. Also, debris in the fuel or a leak in one of the fuel lines , will cause a dangerous lean run. A microscopic pin hole in any fuel line, will do the job nicely.

12-14-2016 03:50 AM
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allns47

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Richmond IN.

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Ok thank you....I went through the fuel system and replaced all tubing and red filter clunk....dual filters fuel jug...and one filter after fuelpump

12-17-2016 06:30 AM
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John Benario

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Las Vegas

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That engine was the second iteration of the C-spec engine. Curtis had used the pump with a return line to prevent the engine from flooding out. OS implemented that idea with this engine. There is no mid range adjust with this carb, so it still wasn't a great running engine. The next iteration of the C-spec had an OS pump and a 3 needle carb which worked much better.

Alan Szabo did use this engine for while with very good results.

The upper fitting has a YS type one way membrane in it, make sure that it is washed out with fresh fuel and works properly. The C-spec overall was one of OS great engines.

Team highest quality
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Cool Power fuel
John's Ultimate building school

12-17-2016 10:52 PM
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slickporsche

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American/Philippines

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allns47

According to O.S. manual, the needle in question is for mid range adjustment if needed. I however,I would leave it alone. If you follow the manual, it will run very well for most flying.

12-18-2016 01:23 AM
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allns47

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Richmond IN.

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When i bought this heli the owner said it belonged to Alan S......on yhe canopy it has his name and ama number....of course i cant verify this...

12-22-2016 08:29 AM
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allns47

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Richmond IN.

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Pic

12-22-2016 12:28 PM
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John Benario

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Las Vegas

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I remember Alan flying the blue canopy. It was 2007 time frame. Don't specifically remember Danny's canopy. This may be that exact helicopter, except of course he may have had more than one of the canopies.

Watch at YouTube

Team highest quality
Futaba radios
Cool Power fuel
John's Ultimate building school

12-22-2016 07:53 PM
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ICUR1-2

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Ottawa, Ontario

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I think you meant Danny szabo which is possible they used fly raptors before align

spending time, paying attention

12-23-2016 01:11 AM
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