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CarbonXtreme . Midland Helicopters . HeliProz

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Speed - Performance - Drag Race > This one is for REAL!!!!
 
 
GroundPounder
Senior Heliman
Location: South Africa, Cape Town

My idiot two cents worth.
On a normal glow motor, not much effect, open ports an' all.
Glow motors actually pushes some unburnt air/fuel mix into the exhaust, to completely scavenge the burnt gasses from the cylinder.
To boost the input gas mix, will only waste more fuel.

You will have much better performance with a properly set up tuned pipe.
The effect of a tuned pipe is to push some of this unburnt air/fuel mix BACK into the cylinder, AFTER the intake port is closed.
Ofcourse, this only works in a very narrow rev range.

A reed valve engine might get some advantage though.

GroundPounder
10-11-2004 Over year old.
 
 
Maytrix
Heliman
Location: Auckland, New Zealand

Too some a 2 stroke is considered to be internally supercharged.

As the piston rises the mixture (fuel and air) is pulled through the hollow section of the crank, into the area below the piston(the crank case), once the piston is around TDC (top dead center) the crank port closes as the piston start's it's downward travel, this compresses the mixture untill the transfer ports are uncovered by the top of the piston. The fresh mixture fills the cylinder as the burnt gasses leave through the exhaust ports, ready to start the cycle all over again.;)
11-17-2004 Over year old.
 
 
Furious Predator
Elite Veteran
Location: Kitchener, Ontario, Canada

Oh man......not this again, haha......check out the post i made not that long ago. you shall see it led to some long last arguments causing me to close the topic.

http://www.runryder.com/helicopter/t141616p1/

Who you decide to believe is up to you, lets not start this again, haha.

Shawn
Team Leisure-Tech
12-07-2004 Over year old.
HOMEPAGE  
 
 
Crusty
Senior Heliman
Location: N51 degrees 29.823 minutes W3 degrees 16.133 minut

Yea well it IS a very old thread, just note, furious raptor didnt come back with the data, that should tell you want you need to know


I am dsylexia of borg..resistance is fruity...your arse will be laminated
12-07-2004 Over year old.
 
 
QuickSilver
Veteran
Location: Cherry Hill, New Jersey

Ok all this sounds great and all, but how do you plan on increasing the fuel pressure/volume to take advantage of the forced air? and how do you plan on controling all this without valves?

Kyle

Life is not measured by the number of breaths we take, but by the moments that take our breath away.
01-06-2005 Over year old.
HOMEPAGE  
 
 
KenJ
Veteran
Location: Ohio, USA

Crusty,

You are kinda correct, I did not see a large improvement, and the results were a little confusing.

In a vertical drag with two machines in the same configuration the supercharged heli won everytime, but not by much.

In a horizontal drag, the normally aspirated machine won 2/3rds of the time.

After playing with many pipes, configurations and set-ups, I believe that there is more power available through head and porting work than there is by just bolting on the supercharger.

One noticable item was that the longer the duration of the Exhaust port timing, the worse the engine ran with the supercharger on. The engine really did get sluggish. Take the SC off and it was the same as the other ported heli.

Sooooooooo

Leave it stock with a muffler and put the SC on,
OR
Go to Brett Moore / Bruce Bennett for some custom porting work and a tuned pipe.

The latter is faster every time.

Ken
01-06-2005 Over year old.
HOMEPAGE  
 
 
The real Ingo
Senior Heliman
Location:

If I have to bet IT will work but doesn't worth

for sure you will have more power thanks to better clean of the combustion chamber but:
1: will suck lot of fuel simply wasted going right to the exhaust
2: Accurate timing of the reso will be a pain and probably never find the balance
3: superch will suck power as any SC. I mean if before you had 2hp now you not only have maybe 2.5hp but also the engine is cranckin the SC and waste another maybe .5HP
in the end you are asking 3hp from you motor that is engineered for 2.
4: too many $$ for this SC, I prefer to buy another engine.

IMHO use more nitro, is better.
Or buy a thermometer and find the best mix of methanol oil and nitro.
Ingo
01-14-2005 Over year old.
 
 
superdave420
Senior Heliman
Location: Sunnyvale, CA. USA

Why doesn't someone from R&B innovations post here on this thread? that would clear up a lot of things if they could show us how ther system was designed to work for these 2 stroke motors. instead of us all saying one thing or another how about some answrs from the real company?
02-15-2005 Over year old.
HOMEPAGE  
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

Superdave, R&B Innovatios is a dead issue, along with their supercharger that will not work on a two stroke piston ported motor.
02-27-2005 Over year old.
 
 
superdave420
Senior Heliman
Location: Sunnyvale, CA. USA

I just read in my RC driver mag about a "centrifical" supercharger that uses an electric motor to drive the impeller. all in all it does the same thing. BUT they had real Dyno Charts showing what exactly the improvement is. and there deffinatley is an imporvement, basically with pulling power. I beleive the only way to verify the miniscule performance increase is with an actual Dyno.

so there really is a bennifit guys. might not be a benifit for heli engines though because we keep them in a constant rpm....

I'll try and find the company and the dyno chart and post here for anyone that is interested.
02-28-2005 Over year old.
HOMEPAGE  
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

Don't believe everything you read Dave.
02-28-2005 Over year old.
 
 
rstacy
Key Veteran
Location: Rochester, NY

Quote 
Don't believe everything you read Dave.


Come on Al. If it is printed or posted, it must be true....
02-28-2005 Over year old.
HOMEPAGE  
 
 
the Wasp
rrProfessor
Location: Vt

(very true Ray LOL)


our glow motors are 2 strokes just as a snowmobile or dirt bike are, maybe a little bit different but still a 2 stroke, and 2 stroke motors (mostly snowmobiles) have been turbo charged successfully for years (see links), and a turbocharger is a blower such as a supercharger is just different,,, turbo charging or super charging our 2 stroke glow motors would work if the unit was made right and setup right, but I just do not see how it would be economically worth all the trouble,,,

it would be much much more economical and easer to just put a larger motor in your heli, as guys are putting 61 size motors in their 50 size helis using 600 size blades, and now there is the Raptor 50 Big Block 90 kit, which happens to be band from our club,,, or you could burn 50% nitro.

http://aolsearch.aol.com/aol/search...roke+snowmobile



Jim
02-28-2005 Over year old.
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

Sorry Jim, they are nothing like our glow motors. If you would like to continue your google search, look and see why they work on these motors. Then come back and tell me what you've learned.
02-28-2005 Over year old.
 
 
the Wasp
rrProfessor
Location: Vt

let me add, as we know from mounting the larger 60B and 60L carbs on the OS 50 that more air does create more power in our glow motors, so forced inducting the correct amount of air with the correct amount of pressure in our glow motors would work, of course to much air would not help .

see Roamer reply on page 4 of the thread in the link.

http://www.runryder.com/helicopter/t141616p4/

Jim
03-01-2005 Over year old.
 
 
Al Magaloff
rrMaster
Location: 12,199 Posts- Enough Time Wasted. See Ya!

Sorry Jim, putting a larger carb on reduces the air intake's restiction. The benefit of the larger carb is due to this reduction in restriction. In order for a supercharger to make pressure, it needs something to push against. ( closed exhaust valves, or port timing that is not present in our glow motors) That something in our current glow motors is a wide open exhaust port. This is history. Quoting out of context generally won't rewrite history.
03-01-2005 Over year old.
 
 
nivlek
Elite Veteran
Location: Norfolk England

I remember reading many years ago, before producing Laser engines, Neil Tidey did supercharge a model engine, I believe it was a H.P.61.
He managed to double its power output but at the cost of quadrupling its fuel consumption.I don't know what mods were made to the engine, but it would seem that supercharging a model engine is quite possible.

At the end of the day , it gets dark .
03-01-2005 Over year old.
 
 
HugeOne
Key Veteran
Location: Quebec, Canada

I got a supercharger on my t-maxx 2.5 for some time and it work! It give good power like 25-35% more or so, accel is crazy fast with this setup. I use nitrous oxyde too, which give even more power for the same weight, wonder if it will be usable on a heli....
Here a pic of my crazy t-maxx:

see the line that enter the SC...it's where nitrous enter the motor, I just used a 188VRX Robart pneumatic retract system, it even have a nitrous gauge!

Raptor e620 w/V-bar, Tango 45-06, Phoenix 85HV, TrueRC 12S1P 4000mAh
03-03-2005 Over year old.
 
 
jake26
Senior Heliman
Location: southern cali

super what....

either way guys a blown 2 stroke aint gonna work due to the intake exhaust overlap the only benifit would be at WFO or its just gonna waist its boost. at high rpms it may work due to the piston speed increase allowing less time with both ports open. if i was to try anything it would be a ys 1.10 in a 50 sure its a little heavy buts its got a huffer on it

fly it like u stole it
06-11-2005 Over year old.
 
 
corey11
Elite Veteran
Location: Bay Area, California

i think if you put a 1.10 in a 50, you wouldnt need the supercharger
06-11-2005 Over year old.
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Speed - Performance - Drag Race > This one is for REAL!!!!
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