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wise(at)txc.net.au
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 Posted: Fri Jan 23, 2009 4:46 pm Post subject: smoke nozzles |
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G'Day All,
Can some of you guys who have a good smoke system on a 52 and 18T please help sort a few problems out.
What is the best position on the exhausts to install the nozzles for max effect?
i.e. How far from the end (outlet) of the exhaust?
I would imagine that 2 nozzles, one on each pipe, would create a better smoke pattern.
Thanks and cheers,
Chris.
[quote][b]
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richard.goode(at)russiana
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| Posted: Fri Jan 23, 2009 11:04 pm Post subject: smoke nozzles |
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In my experience the best place is as high as possible up the final tail-pipe.
A lot is said about the type of nozzle,but if it goes in as a spray,that is fine.
For decent smoke you need about 4/5 litres a minute-ie a bit more than a US gal.
You need a good high presure pump-if you are not too concerned about weight,the best are probably the Jabsco pumps,originally designed for boat bilge-pumps.They are cheap and reliable.If concerned by weight use automotive fuel-injection pumps-but these are 12 volts.
Finally you need a solenoid valve in the circuit to shut the flow,and prevent the oil leaking through when not needed.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
I’m currently in Sri Lanka but this Mail is working,and my local phone is +94 779 132 160.
[quote] ---
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yak52driver
Joined: 05 Jul 2008
Posts: 5
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| Posted: Sat Jan 24, 2009 6:09 am Post subject: smoke nozzles |
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Richard,
Which pump model do you recommend from Jabsco. The Junior Puppy has a flow rate of about 3.4 gallons per minute, would that be too much?
Thanks,
Mike
From: Richard Goode <richard.goode(at)russianaeros.com>
To: yak-list(at)matronics.com
Sent: Saturday, January 24, 2009 1:02:17 AM
Subject: Re: smoke nozzles
In my experience the best place is as high as possible up the final tail-pipe.
A lot is said about the type of nozzle,but if it goes in as a spray,that is fine.
For decent smoke you need about 4/5 litres a minute-ie a bit more than a US gal.
You need a good high presure pump-if you are not too concerned about weight,the best are probably the Jabsco pumps,originally designed for boat bilge-pumps.They are cheap and reliable.If concerned by weight use automotive fuel-injection pumps-but these are 12 volts.
Finally you need a solenoid valve in the circuit to shut the flow,and prevent the oil leaking through when not needed.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
I¢m currently in Sri Lanka but this Mail is working,and my local phone is +94 779 132 160.
[quote] ---
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richard.goode(at)russiana
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| Posted: Sat Jan 24, 2009 8:09 am Post subject: smoke nozzles |
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The figure of 3.4 galls/min is with unimpeded flow.You do need a form of jet,so the oil is easily vapourised in the exhaust and constricting at the jet is the way to keep down to the figure of 4/5 litres/min.
What you do not want is a low powered pump which will deliver that same volume,but unrestricted,so it just dribbles into the exhaust.So you need the 3+ galls/min capacity which is then throttled back as it pushes a jet of oil into the exhaust.
Richard Goode Aerobatics
Rhodds Farm
Lyonshall
Hereford
HR5 3LW
United Kingdom
Tel: +44 (0) 1544 340120
Fax: +44 (0) 1544 340129
www.russianaeros.com
I’m currently in Sri Lanka but this Mail is working,and my local phone is +94 779 132 160.
[quote] ---
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Mozam
Joined: 24 Nov 2006
Posts: 85
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| Posted: Sat Jan 24, 2009 11:07 am Post subject: Re: smoke nozzles |
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FWIW, I tried numerous home-made nozzles that just didn't do a good job and was amazed at how much better a nozzle from SmokingAirplanes.com worked. I don't use their whole system, just the injector nozzle they sell.
Now I have great smoke for our formation acro show using just one nozzle at a flow rate of .75 gal/min (3 litres/min). The other wingman in our show has two nozzles (non-Smoking Airplanes, I think) and you cannot tell the difference in smoke as we fly together.
Put the single nozzle on the left side exhaust (#4 cylinder side) and you will get LOTS less smoke in the cockpit during aerobatics than with a right side nozzle. With any AOA on the Yak the right side smoke goes over the wing while the left side flows more under the wing. I assume due to propwash. However, at slow speeds (hammerheads, spins, snaprolls, etc) you'll still get smoke over the left wing.
Cheers,
Steve Dalton
Left wing, Yak Attack
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Etienne Verhellen
Joined: 13 Apr 2007
Posts: 141
Location: Belgium
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wise(at)txc.net.au
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| Posted: Sat Jan 24, 2009 7:40 pm Post subject: smoke nozzles |
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G'day Richard,
Thanks for that.
I have had a look at the Jabsco site.
Do you know the model No of the Jabsco Bilge Pump?
Thanks and Kind regards,
Chris.
[quote] ---
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ChangDriver
Joined: 15 Sep 2007
Posts: 266
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| Posted: Sun Jan 25, 2009 5:58 pm Post subject: Re: smoke nozzles |
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Why not just order a whole kit from smoking airplanes? All there, simple to install and it works.
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