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Supercharger on heli

Justin Stuart

rrMaster

Plano, Texas

I think the video clearly shows a miniature turbo charger which is presumably connected to the intake of the engine via a metal pipe, but as stated earlier, I don't think turbo charging really works all that well with a 2-stroke motor because both ports are open at the same time. But, like the OS engine in the picture, supercharging and turbo charging works great with 4-stroke motors.

Is it possible the motor in the video is indeed 4-stroke?

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12-29-2009 Over year old.
BeltFedBrowning

Key Veteran

USA

My Tmaxx(RC car) had a belt driven RB inno "supercharger" on it. It ran but it ran better without the supercharger. It does NOT work on an RC car with a 2-stroke!

12-29-2009 Over year old.
moshe shemueli

Heliman

israel

Their site they write that it works with two-stroke engine I've confused
Working or not working

Quote
* Maximizes scavenging process of the two stroke engine
* Typical power gains range from 15.6% to 27.3% depending on engine and pipe combustion, as well as the Super-Charger setup

http://www.rbinnovations.com/articles.asp?id=134

12-29-2009 Over year old.
BeltFedBrowning

Key Veteran

USA

I thought it was the greatest thing I had ever seen. I bought one and did my darndest to make it work. I never saw the gains. Unless you count more power from running too lean. The fuel blows through the cylinder and out the muffler without being burned under high boost/high RPM, resulting in lean runs and temps well over 300 degrees.

12-29-2009 Over year old.
Paul Hinz

Senior Heliman

Oostburg, WI

The pictured 4-stroke motor is not a YS, it is a OS. YS 4-stroke motors use the piston coming down in the crankcase to pressurize the air/fuel mixture then store one charge in either a air chamber inthe intake tube or in the valve cover. It then compress's a second charge in the crackcase and then when the intake valve opens both charges are forced into the combustion chamber.

Paul

12-30-2009 Over year old.
Gearhead

rrMaster

Vt

Forced Air Induction on a 2st

if you search the Net you will see it's been done and it works, but they were Gasoline 2st Snowmobile Engines, and it works on Diesel 2st too, that's not to far away from our little glow engines,,

the #1 issue on Forced Air Induction on a 2st is setup, setup, setup, that RB thing is just junk IMO..

Jim
Buzz Buzz Buzz

12-30-2009 Over year old.
Alexm0324

Senior Heliman

Atlanta, Georgia USA

My friend has the RB Innovations Supercharger on his Raptor 50 with an OS 50 Hyper. It has been there for about 8 months now. I can't remember the pulley configuration, but he has tried all of them and I have witnessed it personally.

There may be a performance gain, but very little if any in my opinion. The unit weighs around 50 grams if I remember correctly. It did allow him to lean it out by about 4-5 clicks so there was better fuel economy adding about 1 minute of flight time. After leaning it for performance it was marginally stronger than before and came down at the same temperatures (175F) as it did stock with a richer setting. It also recovered from bogging ever so slightly faster. You can barely hear the supercharger hiss, but it is there if you listen for it. If it was my helicopter I would have done port mods and crank mods and put a set of 440c stainless bearings in it. I would guess that would get about the same gain. I'm going to try the port and crank mods on an older OS 50 Hyper sometime next week.

My opinion is that the supercharger does something, but not enough to merit buying one. Get a new big block or do the port and crank mods instead.

We have pics and video if anyone is interested. I can't post them until he returns from Germany for the Holidays. I'll also see if I can get him to chime in on this post.

12-30-2009 Over year old.
HOMEPAGE  
nivlek

rrProfessor

Norfolk England

It did allow him to lean it out by about 4-5 clicks
That just about proves that it doesn't work ! The supercharger is supposed to blow more air into the engine , which would require the mixture to be richened .

At the end of the day , it gets dark .

12-30-2009 Over year old.
aussie_g

Veteran

Travelers Rest, South Carolina, USA

Any IC engine can perform better with forced induction from either a supercharger, turbocharger or the chemical version - Nitrous Oxide

But is needs to be a well designed system - not just bolting a blower on the side.

Also, on the video above, the turbo needs to be piped between the engine & muffler, not after the muffler - the muffler has disrupted the exhaust flow & there would be a huge loss in flow due to the expansion chamber

Gareth

12-30-2009 Over year old.
hornet dave

Key Veteran

Cedar Rapids, IA USA

The turbo looks like a hoax to me. But what do I know?

It's funny how the supercharger STILL comes up every couple years but goes nowhere.

I got a fever! The only prescription is MORE 6HV

12-30-2009 Over year old.
Justin Stuart

rrMaster

Plano, Texas

It's funny how the supercharger STILL comes up every couple years but goes nowhere.
I think the reason the supercharger/turbocharger never really catches on is because now days you can always just buy a larger motor.

In the case of the OS engine shown earlier with the supercharger, the reason that motor was created and successfully marketed was because in the 1990s the AMA would limit engine displacement for pattern competition to .61ci for 2-stroke and 1.20ci for 4-stroke such that modelers were willing to do whatever they could to squeeze every last bit of power out of their engine. Thus in those times we saw a nearly ubiquitous use of tuned pipes on 2-strokes and the innovation of superchargers on 4-strokes.

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12-30-2009 Over year old.
hornet dave

Key Veteran

Cedar Rapids, IA USA

I think they never catch on (for 2 strokes at least) because they don't work. It's just that every two years or so, there's enough people new to the hobby that don't know they don't work and order the things, just to find out they don't work.

I got a fever! The only prescription is MORE 6HV

12-30-2009 Over year old.
Gearhead

rrMaster

Vt

it's not that "they" don't work, it's that the Blower in question (the RB) doesn't work, it's not even a real blower, its a fan !!, and if it's not made correctly it will not work correctly !!

ask any Performance Engine Builder that know his stuff and he will tell you Normally Aspirated Internal Combustion Engines "without" some-sort of blower never completely fills full of Air !! yes my friends that is correct !!

here are some things to ask yourself's,,

A) what do Engine Builders tell you, the Internal Combustion Engine is nothing more than an Air Pump,, more Air more power,, but not to much Air,,

B) ask yourself why your Engine has less power at half throttle and more power at full Throttle,, more Air more power,,

B1) now ask yourself what will happen if you have a well made Blower on your Engine and your Engine is running at half Throttle,,

C) look at the old OS Silver Head 50, it had the 40E carb,, now what happen when OS put the larger 60L carb on,,, more Air = more power,,

C1) would the smaller 40E carb with a Blower create an equal amount of Air Volume at the 60L carb,, yes IF the Blower was made and setup correctly,,

D) why does modifying an Engines create more power, because the Engine gets more Air in the Combustion Chamber,,

E) why did OS port the Piston on their new 55 heli engine, again~ more Air for the Combustion Chamber,,

again, the RB thing is just a fan, like using a Boat Prop in a Water-Jet, don't work !!

Jim
Buzz Buzz Buzz

12-31-2009 Over year old.
Billebob

Veteran

Tim-buck-2

2 stroke snake oil.

01-01-2010 Over year old.
Jeff polisena

Elite Veteran

westpalmbeachflorida usa

I have seen one belt driven did not seem to help with more power and belt would come off or break a lot

I stole it ,flew it and gave it back ;)

01-01-2010 Over year old.
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