Baffle or no baffle, that is the question

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3 years 3 months ago - 3 years 3 months ago #23969 by Phil Ford
Replied by Phil Ford on topic Baffle or no baffle, that is the question

Jeff Hobby wrote: Poor Dave, bit harsh


That's nothing Jeff compared with what he usually gets...:lol:

Back to the issue, I believe the rule of thumb was that the air flow exit size at least twice the air flow in but not always so easy in practice. Scale models the worst I think because you just cannot hack holes where needed or it ruin it's looks.
Last edit: 3 years 3 months ago by Phil Ford.

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3 years 3 months ago #23971 by JonTappin
Replied by JonTappin on topic Baffle or no baffle, that is the question

Jeff Hobby wrote: Poor Dave, bit harsh


I did it for you Jeff, payback for the finger incident :)

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3 years 3 months ago - 3 years 3 months ago #23975 by Phil Ford
Replied by Phil Ford on topic Baffle or no baffle, that is the question

Jon Tappin wrote:

Jeff Hobby wrote: Poor Dave, bit harsh


I did it for you Jeff, payback for the finger incident :)

:lol: Another roasting for poor Dave. I am "baffled" as to why Dave gets reminded of "classic fails" :unsure:
Last edit: 3 years 3 months ago by Phil Ford.

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3 years 3 months ago #23976 by Phil Ford
Replied by Phil Ford on topic Baffle or no baffle, that is the question
Speaking of baffles Jon, would foam board cope glued into a grp baffle. I think you said it was fine.:unsure:

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3 years 3 months ago #23978 by JonTappin
Replied by JonTappin on topic Baffle or no baffle, that is the question
I have used card faced foam board for baffling around flat twins and it's fine, I'm not certain it would be as good for a radial baffle as the air would be hitting it on its flat face, so may not be strong enough to cope with the pressure
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3 years 3 months ago #23979 by kevinross
Replied by kevinross on topic Baffle or no baffle, that is the question
I remember reading an article by Brian Winch about the Saito engines in which he emphasised the need to cool the crankcase. Note that the FG 84 & 90 have additional cooling fins attached to the crankcase in between the cylinders for good reason. So a simple flat baffle might not be ideal. This link has some useful info on Saito baffle construction. note that provision is made to cool the crankcase fins.

www.modelairplanenews.com/make-cooling-b...-engine/#outer-popup

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