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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Volocity Stacks, do they do anything special?
11-25-2006 01:54 AM  11 years agoPost 1
Chopper Man100

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Canton GA.

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Whats the general RR knowledge base say about Volocity stacks. Are they all show or do they really do something good for the engine performance?

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11-25-2006 02:18 AM  11 years agoPost 2
SteveH

rrProfessor

Texas

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They make the carburetor "noise", louder.

The government cannot give you anything without first taking it from someone else.

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11-25-2006 05:06 AM  11 years agoPost 3
rbort

rrProfessor

Franklin, MA - USA

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The wear your engine out quicker
They suck in dirt that you kick up with the rotor blast and wear your motor out quicker.

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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11-25-2006 07:30 AM  11 years agoPost 4
FCM

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Surrey, England

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They allow the engine to breath properly. They can give you a small increase in power, depending on the design, but I have found that the G230 engine is easier to tune being less sensitive on the needles with a Vario velocity stack and free flowing exhaust system.

The velocity stack will provide better fuel mixing than you can get with an air filter but FOD is always a worry unless you take precautions against it like flying from a rubber mat and always fitting an intake blank right after shut-down.

Hope this helps.

Paul.

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11-25-2006 02:52 PM  11 years agoPost 5
Chopper Man100

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Canton GA.

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FCM, you got me, what is FOD, it will probably come to me as soon as I hit the send button here. (foul old dirt?, Fart odor debris?)

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11-25-2006 06:25 PM  11 years agoPost 6
Christopher J

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Kansas City, MO Californian lost in land of Oz

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FOD on full size helis normally refers to Foriegn Object Deflector. I guess on RC helis it refers to Foriegh Object Debris.

I don't run velocity stacks on the gassers I fly. I noticed they still would have some flim of dust and dirt on them so I switched to running X-Cell gasser air fliters on my helis. No dirt in the carbs nor any tuning issues.

Christopher J
same as I ever was
"Still all set & Flying the original"

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11-25-2006 08:23 PM  11 years agoPost 7
Notar

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Taxachussetts

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The stack allows air to come into it in a circular motion, and fuel does not come out. If you hold your hand next to a carb without anything on it, sometimes you feel a fuel droplet coming out. With the stack, it allows the air to enter keeping this fuel in the carb. In a fuse with doors, it would be fine. I personally do not fly with the stack or filter, and have no problems.
Joe

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11-25-2006 09:44 PM  11 years agoPost 8
Chopper Man100

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Canton GA.

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I had a carb with a stack on it (167A). I replaced the 167A with a 643. Obviously the stack wouldn't fit the 643. So I was wondering if I was going to be going backward in the effort for looking for a little more power if I installed the 643 without my existing stack versus the 167A with the stack.

So far, I like the 643, really easy to adjust, very forgiving on adjustments. In fact I had it rich enough to smoke today without it 4 stroking in a hover, couldn't do that with the 167A. Haven't been able to go into foward flight yet, not enought room in my back yard.

Back to the stack issue, I have notice that after a flight, the stack comes back wet once in a while when I had the 167A on there.

I have to look closer at the 643 without the stack and see if I see any fuel residue in the inlet side of the carb.

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11-25-2006 11:31 PM  11 years agoPost 9
FCM

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Surrey, England

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Sorry - FOD = foreign object damage at least that's what it means to me

Paul.

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11-26-2006 02:11 AM  11 years agoPost 10
BrunoBL

rrKey Veteran

Pomerode, SC, Brazil -26.71, -49.17

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FOD = foreign object damage at least that's what it means to me
That is how I learned it too.
Airports around here have lots of "Beware of FOD" signs spread around on the tarmac.

...Bruno.

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11-26-2006 02:31 PM  11 years agoPost 11
Chopper Man100

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Canton GA.

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Wow, no kidding! I would have never thought that there was so much FOD around. Well I learned something new today! I think I need to stop learning because I think I am forgetting more than I am learning and if I stop learning, maybe I stop forgetting.

I see daves motors has an air cleaner with a stack include for inside the air cleaner, think I am investing in one of those babies, that solve all questionable issues.

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11-27-2006 04:02 AM  11 years agoPost 12
asong26

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VA

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What about these?
http://www.davesmotors.com/store/product101.html

The Velocity Stack is integrated within the air filter. Based on my limited knowledge of spiral air flow, I am assuming this has to be a lot better in power out put, and fuel efficiency (when compared to stock air can, and even the air filters from K&S or the Min-Air version). And since they are contained within an air filter, I would also assume that FOD is a non-issue.

I am thinking of getting one. I have the G231 TRM. I am not exactly sure of of carb version number. Anyone know?

Andrew

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11-27-2006 04:09 AM  11 years agoPost 13
quadcopter

rrNovice

Brandon Florida

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it is kida complicated the way that velocity stacks work. they change the way that the air flows into your carb.. depending on the type that you have the do straighten the air comming in. and they also increase the velocity of air entering the carb as it is "squeezed" into the stack. and without a filter on it, it will suck in dirt.
I would only use one for racing or compitition for that extra little umph in the engin.

anyone got a nitro heli for sale for $300 or less???

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11-27-2006 04:17 AM  11 years agoPost 14
Chopper Man100

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Canton GA.

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I am loving this new FOD term (new to me)

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11-27-2006 04:20 AM  11 years agoPost 15
asong26

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VA

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I think this is why the filter contained stack is a very good idea. And this has to be better for the heli in every way:

a. Smoother throttle due to improved air / fuel mixture
b. More power due to cooler air coming in
c. Improved fuel efficiency also due to better air / fuel mixture

I think this is a no-brainer upgrade. And at $15 - $20 bucks, I feel it's definitely worth it. Of course this is just my opinion based on my preference.

Many people are happy with what they have at stock form, as long as they are good enough. I am on the other hand will always look for improved mechanics, efficiency and aesthetics.

Andrew

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11-27-2006 12:19 PM  11 years agoPost 16
FCM

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Surrey, England

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Andrew, I think you should contact John Garste and ask him what he recommends with your TRM engine. This engine sounds really powerful and may require something special.

Paul.

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11-27-2006 01:51 PM  11 years agoPost 17
asong26

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VA

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John's original post regarding the air filter was very simple. He mentioned that he does recommend that air filter, but also said that the stock air filter foam will work adequately. There was no mentioning of velocity stack. I've already pinged him about this, and hope he'll respond soon. I think Mr. Garst is very busy lately, or on hibernation mode for the build season.

Andrew

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11-27-2006 05:16 PM  11 years agoPost 18
asong26

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VA

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For those interested: This is what I've got:

Proline Velocity Stack DDM Part# af316
'UFO' Filter Kit af22x (blue)

I could've bought a choke with this to be integrated inside, but at this stage of my engine running so smooth, I didn't feel this is needed. If I ever let me heli sit without running for months and needs to be choked again, I'll just use some tapes to cover the intake from outside. After that, these engine typically never require a choke. Couple of good pulls, and you're done.

If you buy the the 'UFO' filter kit, there is an option to get a standard velocity stack for about $8. For me, I wanted to Proline version of the stack that increases air flow efficiency. This should be another 'Nice' addition to my TRM G231. It should also match my new QuickUK blue AVANT swashplate and tail blades nicely.

Andrew

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12-09-2006 03:22 AM  11 years agoPost 19
haro..

rrNovice

wallingford Ct, us

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49cc engines
I have a 49cc two stroke engine it has a stock carb ufo ufo air filter and velocity stack..... the velocity stack does not have a choke would this affect my engine or should i just run it as is

-Pbiker

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12-09-2006 05:58 AM  11 years agoPost 20
asong26

rrVeteran

VA

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It depends if you need a choke or not. Some carburetors have chokes built onto them as well. I am not sure if this is the case with your motor. As far as the g231 and G260 motors are concerned, you would very rarely use the choke.

My original carburetor did not have any choke built on it, and when I switched to the UFO filter can w/ the velocity stack, I did not get a version with the choke built on. I ended up making my own portable choke.

Basically I cut out a foam rubber that I was using to wrap my radio, and attached a velcro on it. I would then use the foam rubber to completely wrap the filter from outside. This pretty much stop the air from going in (same as the choke). This worked out very well.

But still, I had only used this home made choke only once, since these motors will start up very easily once the carb has been primed. But again, I am not sure about your motor.

Andrew

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