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HelicopterMain Discussion › Raptor 50 supercharger
03-09-2006 01:07 AM  11 years agoPost 1
l-milk

Senior Heliman

georgia

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http://www.rbinnovations.com/catalo...7423a62d39c294c
has anybody seen this supercharger or have used one. it is for a 50 size.
click on link above.

just fly

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03-09-2006 01:09 AM  11 years agoPost 2
300wby

Veteran

Columbia City, Indiana

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Check in the speed performance and drag race section, might have to search.

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03-09-2006 01:22 AM  11 years agoPost 3
wonderboy

Senior Heliman

Southeast, MI

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This has come up in the past a few times. Based on what I remember from the discussions, the performance increase was debatable. Fundamentally, our two stroke heli engines (two stroke glow engines in general) are not well suited to super charging due to the nature of the intake and exhaust porting. Basically, the intake and exhaust ports are both open at roughly the same times. For a nice supercharging effect, you would want to have the exhaust port closed while the intake is still open, therefore allowing the supercharger to increase the pressures in the cylinder prior to the compression stroke. That is not to say it can't be done, but the benefit of just slapping a supercharging device on a standard heli (two-stroke) engine without any other mods is questionable. This is all based on my observations from previous posts, not from personal experience, so take it for what its worth.

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03-09-2006 01:24 AM  11 years agoPost 4
wonderboy

Senior Heliman

Southeast, MI

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...form your own opinion based on this:

http://runryder.com/helicopter/t501...t=supercharging

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03-09-2006 02:07 AM  11 years agoPost 5
Yug

rrMaster

UK. Herts

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From what I've read, these don't really cut the mustard because RC engines are not best suited.

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03-09-2006 02:38 AM  11 years agoPost 6
BlakeMcBrayer

Elite Veteran

Georgetown, Ky

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Here is a copy of what I posted on it in your other thread on the same topic.
Don't waist you money! I had one on a .32 powered truck. It did make some additional power, but it wasn't much. Just enough to off set the additional weight.

It's hard to supercharge a two stroke engine, as the exhaust port and intake port are open at the same time. The charge tends to just blow in and then right out the exhaust port. I feel the only reason it does make some more power is that it tends to blow more of the exhaust gases out of the chamber, thus getting in more fuel and oxygen.
.

Don't come off the throttle untill you see your GOD!

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03-09-2006 02:55 AM  11 years agoPost 7
RappyTappy

rrProfessor

North Denver, Colorado

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Yep, it no workie that good.

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03-09-2006 05:58 AM  11 years agoPost 8
wuzofoz

Senior Heliman

Brisbane,Queensland- Australia

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i have not used one. i just don't see how they could have any posative effect on a two stroke engine.
after combustion the first port open is the exaust then the intake.
fuel is pushed into the combustion chamber by pressure in the crankcase ( this is the only thing i feel a supercharger on a two stroke could increase ).
with the piston traveling up the intake ports close first then the exaust.
so how any exta combustion pressure could be created without special exaust port valving is beyond me.
it may be posible that the pipe is running at a higher pressure and it's created that way but would be a verry small increase.

for a power increase there is no subtitute for a good pipe for you application and tuning.

just my 2cents.

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03-09-2006 10:34 AM  11 years agoPost 9
Professorwiz

Veteran

Livonia, Michigan - USA

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Might be enough for someone to get a 4 stroke heli engine working well enough. I'd love to see a good strong 4 stroke engine in that size.

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03-09-2006 11:28 AM  11 years agoPost 10
l-milk

Senior Heliman

georgia

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thank you for all of the replies.
i will keep my money and not waste my time on this.
thanks again

just fly

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03-09-2006 11:50 AM  11 years agoPost 11
bagobitz

Veteran

saddleworth,lancs,UK

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supercharging will only be effective on a 4-stroke (appropriate valve-timing helps!) the ways to get performance increases from 2-strokes are well documented...padded crank-case,fully gas-flowed,tuned inlet and exhaust tracts,etc.
the most effective "tweak" is the tuned exhaust....effectively it drags new mixture straight through the engine and partially filling the pipe the pressure wave then shoves the gas/mixture BACK up the pipe into the cylinder,before the ports close. the net effect is "supercharging"...the cylinder is charged at a higher than atmospheric pressure BEFORE the piston starts compressing the charge.

4-strokes CAN be tuned in exactly the same way, a heli engine is an ideal candidate,because the speed is constant-very important as resonation only occurs over very narrow rev-bands. I have heard that a 4-stroke running at a properly tuned speed,can have both valves held open and will continue to run!

anyone remember when the Isle of Man TT races first attracted the Japs? The 50 cc bikes were so highly tuned that they had something like 24-speed gearboxes, in orer to keep them revving in the power-band (was about the same as a 125cc but only within a 500rpm range)
IIRC they went to 15,000rpm when the average British bikes wouldn't do much above5,000.....no wonder we called them "rice-grinders"

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03-09-2006 07:49 PM  11 years agoPost 12
BlakeMcBrayer

Elite Veteran

Georgetown, Ky

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I will keep my money and not waste my time on this.
Wise thing to do! IMHO!

Spend the cash you save on USEFUL upgrades and/or more fuel to burn!

.

Don't come off the throttle untill you see your GOD!

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