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HomeAircraftHelicopterMain Discussion › A general question on "Nitro" engines.
10-16-2017 10:26 PM  9 months agoPost 41
heliraptor10

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kokomo, in-US

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Exhaust=hot

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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10-16-2017 10:34 PM  9 months agoPost 42
heliraptor10

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kokomo, in-US

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Its not just a vacuum.
The vortex means its state dependent.

Its just another feature of tuning.

Every curve every change in diameter of the exhaust serves a function. Just like a brass instrument. The sound, the "tuning" of an engine is dependent on cyclones. A vortex creates sound and vice versa.

And Ee is right... This is nothing new. I'm just using it a different perhaps "wrong" way.

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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10-16-2017 10:36 PM  9 months agoPost 43
R.J.

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SF bay area, CA USA

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Maybe cars are different. Helicopters many times use a rubber exhaust deflector. Todd Bennett taught us to cover the exhaust to shut down the engine quickly if you had a hot start or emergency.

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10-16-2017 10:52 PM  9 months agoPost 44
EEngineer

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TX

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The sound, the "tuning" of an engine is dependent on cyclones.
No it's not. Has nothing to do with "cyclones".

It's dependent upon the length of the pipe's internal exhaust baffle from the engine's exhaust port at the RPM you plan to run the engine at.

And works best if the header's exhaust port is "ported" to the engine's exhaust port.

Logo 600SXs, 800XX, TDR IIs

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10-17-2017 12:24 AM  9 months agoPost 45
JuanRodriguez

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The Villages, Florida

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EEngineer
The sound, the "tuning" of an engine is dependent on cyclones.
No it's not. Has nothing to do with "cyclones".
Perhaps throwing an electrical field around the contraption would help the cyclone travel backwards into the combustion chamber to produce a boost!!

Heliraptor10 has extensive experience with “coils” so it should be a piece of cake to come up with something suitable !!

Been there, done that and old enough to know better.....

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10-17-2017 12:35 AM  9 months agoPost 46
dkshema

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Cedar Rapids, IA

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Remember that tuned exhaust systems are effective only over a relatively narrow RPM range, and work great when you are "on the pipe". Outside that range, you have a finicky engine.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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10-17-2017 12:38 AM  9 months agoPost 47
spaceman spiff

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Tucson

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Perhaps throwing an electrical field around the contraption would help the cyclone travel backwards into the combustion chamber to produce a boost!!
I like it. Does it matter if the car is north or south of the equator? Perhaps reverse the coil polarity depending on coriolis effect?

Watch at YouTube

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10-17-2017 12:46 AM  9 months agoPost 48
JuanRodriguez

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dkshema I
Remember that tuned aare effective only over a relatively narrow RPM range, and work great when you are "on the pipe". Outside that range, you have a finicky engine.
And that’s why most of the folks that I know that have tried a tuned pipe have given up on them and gone back to the plain muffler....

Been there, done that and old enough to know better.....

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10-17-2017 12:50 AM  9 months agoPost 49
JuanRodriguez

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The Villages, Florida

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spaceman spiff
I like it. Does it matter if the car is north or south of the equator? Perhaps reverse the coil polarity depending on coriolis effect?
Or only run the car while it’s traveling east/west !!!

Been there, done that and old enough to know better.....

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10-17-2017 02:14 AM  9 months agoPost 50
heliraptor10

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kokomo, in-US

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A mass of air forced to curve will roll.
The very first bend out of a nitro starts a vortex. The tuned pipe then expands allowing the exhaust to gain kinetic energy. A cone inside the pipe means that the high energy high pressure exhaust is forced to spin one last time before exiting.

Watch at YouTube

Goblin! where have you been all my life?
RC helis, the original fidget spinners

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10-17-2017 02:18 AM  9 months agoPost 51
EEngineer

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TX

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Oh, that's just baloney.....lol

Logo 600SXs, 800XX, TDR IIs

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10-17-2017 02:36 AM  9 months agoPost 52
spaceman spiff

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Tucson

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My Dad had this great turbine he would bring out around Christmas time. He would let me light the candles, and the angels would get all happy and start flying around in a circle, clanging a couple bells.

When i grew up i attached a pulley to the top and used spining angel power to run my air conditioner. It worked great untill the Pope found out and stole my generator to run Vatican city.

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10-17-2017 03:50 AM  9 months agoPost 53
dkshema

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Cedar Rapids, IA

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So what, exactly, is your vortex supposed to accomplish? Does it matter that the exhaust is not delivered as a steady, uninterrupted flow, but is delivered as a continuous series of pulses whose frequency and width varies with RPM?

What is special about the Gallus lamp other than it makes the flame rotate? Does the candle burn rate change when you put the chimney on?

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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10-17-2017 03:55 AM  9 months agoPost 54
EEngineer

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TX

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Remember those TV commercials "hawking" that BS of "twirling" the intake inflow.

Claiming all sorts of ridiculously increased gas mileage....which never panned out.

Sounds a bit like that....

Logo 600SXs, 800XX, TDR IIs

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10-17-2017 04:04 AM  9 months agoPost 55
spaceman spiff

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Tucson

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I have an idea for smokers. You take one of these dyson fans and swich a diode inside, then you blow smoke rings thru the circle. Boom! Instant Mega Zilla watts!

See the POWER in these awesome smoke rings! its like 950 PSI of boost!

Watch at YouTube

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10-17-2017 04:21 AM  9 months agoPost 56
dkshema

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Cedar Rapids, IA

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Perhaps you are playing with laminar flow and not realizing that you should instead be concentrating on wave theory.

Or those old Semco flow through mufflers missed the boat by not putting vortex generators on the ID of the flow through portion of the exhaust.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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10-17-2017 04:26 AM  9 months agoPost 57
dkshema

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Cedar Rapids, IA

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Spiff - we have a couple of those old Christmas candle/spinner things.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

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10-17-2017 04:42 AM  9 months agoPost 58
spaceman spiff

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Tucson

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dkshema
we have a couple of those old Christmas candle/spinner things.
Shhhh.... Don't let the Pope or Kim Jong Un find out!

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