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Engine Baffling for in-line twins

Old 09-20-2013, 06:13 AM
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kmtranmd
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Default Engine Baffling for in-line twins

I'm looking for good baffling design for in-line twin application in a Ziroli P51 winter project.
I'm considering using ZDZ 100 but concerned about cooking the aft cylinder.
Easy option is to drop in an 85cc single, but would like to research the inline twin first option.
Please post your personal experience with this set up.
Thanks,
Old 09-20-2013, 07:43 AM
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alanc
 
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i havnt had any experiance with in line twins, only singles, and flat twins, but this lot covers most of what you need
http://www.troybuiltmodels.com/ns/le...g-easy-how-to/
Old 09-20-2013, 07:25 PM
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Veltro
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3W includes a little information on baffling in the manuals for their in-lines. Also, DA's 100 in-line engine has been out for several months, but for some reason they're aren't advertising it. It costs about $500 less than the 3W.

http://www.3w-modellmotoren.com/file...R2_englneu.pdf

Photos on in-line installation are about half way down the page on this link:

http://www.3w-modellmotoren.com/navi...-pictures.html
Old 09-23-2013, 06:48 AM
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kmtranmd
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Thanks for the feedback.
But the pics in the 3W manual does not show the baffling to ensure adequate cooling for the aft engine.
I did not know DA makes 100cc inline twin.
That may be my engine for the Ziroli mustang.
Please show pics of actual installation if you guys have done it.
Old 09-23-2013, 07:04 AM
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invertmast
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Originally Posted by kmtranmd View Post
Thanks for the feedback.
But the pics in the 3W manual does not show the baffling to ensure adequate cooling for the aft engine.
I did not know DA makes 100cc inline twin.
That may be my engine for the Ziroli mustang.
Please show pics of actual installation if you guys have done it.

If you click on the second link in the post before your last one, it shows actual photos of installs. When your installing an inline twin, you basically want to treat it like an opposed 4cyl. Boxer engine. You want the inlet coooling air for both cylinders to be directed by baffles to one side of the engine, forced through the cylinder fins to the opposite side of the motor and then out of the cooling hole exit.
Old 09-23-2013, 08:05 AM
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Look at the way a full scale lycoming or continental is baffled in a Cessna or any other cowled engine. The air is forced through the fins by sealing half of the cylinder to the incoming cool air, and then once it goes the fins, the only openings are exit(s). The cool air MUST go through the fins to be effective.
Somewhere on this site there are posts about a guy baffling an inline twin in a P-51. It is either a Comp-ARF kit or a 3W kit, I can't remember which. A mustang can be tougher to cool since the inlet is small and there isn't any outlet, scalewise.

Last edited by JeffH; 09-23-2013 at 08:07 AM.
Old 09-24-2013, 10:24 PM
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kmtranmd
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I see what you guys mean.
I've done baffling on my 3W twin a bit different, not pretty, but hopefully will be effective.
Have not flown yet with this installation.
It's 3W 80 twin on Vally Aviation Sea Fury.
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Old 01-17-2015, 02:41 AM
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Cardboard and barbecue wood sticks then epoxied them all with thin epoxy. Pics at (post 9):

http://www.rcuniverse.com/forum/gian...l#post11963275

Last edited by jak_kkaall; 01-17-2015 at 02:44 AM.
Old 01-17-2015, 07:57 PM
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radfordc
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Here is a good article on how to do it: http://www.supercoolprops.com/articl...delengines.php

Here is how the big boys do it: www.sonex604.com/misc/NASA_CR3405.pdf
Old 01-18-2015, 05:40 AM
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MarkShapiro
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Here you go. This is on my 3W P-51. Perfect system. No cooling issues whatsoever. A lot of effort; but works. Air enters at chin scoop, if forced over cylinders, hot air goes through large opening in firewall, proceeds through the length of the fuselage and exits out of the lower rear vent, which is adjustable as needed with transmitter dial.
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Last edited by MarkShapiro; 01-18-2015 at 05:44 AM.
Old 01-18-2015, 07:06 AM
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Very nice work Mark
Old 01-18-2015, 02:09 PM
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Thank you, sir.
Old 01-18-2015, 04:25 PM
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some more shots for you.
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Old 01-22-2015, 10:02 PM
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I have the ZDZ inline 100 in my yellow P 40 Warhawk. Also in the process of doing the duct work The difference between 3W in line engines and ZDZ is The airflow comes in through the side unlike 3W engines cooling fins airflow comes from the front. But so far it is working out pretty good but the P 40 Warhawk has a big giant hole in the front to work with unlike a Mustang. I had a friend with a quarter scale P 51 with the same engine as mine and what he did is used the radiator duct and ran tubing all the way up front to help cool the engine because of lack of air intake in the front of the cowl. It worked out really good for him he never had any overheating issues

Last edited by 77chickenhawk; 01-22-2015 at 10:05 PM.
Old 01-23-2015, 05:03 AM
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Ohsh1t
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Originally Posted by MarkShapiro View Post
Here you go. This is on my 3W P-51. Perfect system. No cooling issues whatsoever. A lot of effort; but works. Air enters at chin scoop, if forced over cylinders, hot air goes through large opening in firewall, proceeds through the length of the fuselage and exits out of the lower rear vent, which is adjustable as needed with transmitter dial.
Hi Mark, great job! I am fitting this exact same engine to my 3W P51D fuselage so will be copying your work! Can I ask, why have you welded a doubling plate onto your existing plate specifically where the engine mounts?
Also I think I can see your exhaust going straight down behind the front mounting plate. Does it just exit out the bottom of the fuselage?
Thanks
Cary

Last edited by Ohsh1t; 01-23-2015 at 06:10 AM.
Old 01-23-2015, 11:47 AM
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77chickenhawk
 
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Exactly what my friend did

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