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Design => Stunt design => Topic started by: tom creasey on December 22, 2015, 09:21:18 PM

Title: blown flap system
Post by: tom creasey on December 22, 2015, 09:21:18 PM

I don't know were to post my build, so I put my build in a couple of spots. This is Sherry Beth my P40- Warhawk and build from scratch except the wing is from a Twister kit and the fuselage is from a Midwest P-40 kit from which I built in 1976. My paint scheme is WWII 80th fighter group. Feel free to comment

Title: Re: blown flap system
Post by: tom creasey on December 22, 2015, 09:34:41 PM

   Anybody wants to build the blown flap system PM me

Title: Re: blown flap system
Post by: Andrew Tinsley on December 28, 2015, 07:25:18 AM

Hello Tom,
Looks very interesting, have you tried the system on other models? If so, how did it turn out? I don't claim to understand how this works, have you an explanation for a layman?

Regards,

Andrew.

Title: Re: blown flap system
Post by: rustler on December 28, 2015, 01:11:53 PM

Is it truly blown, or is it just directing airflow?

Title: Re: blown flap system
Post by: Howard Rush on December 28, 2015, 01:46:49 PM

It's just directing airflow.  This is a matter of definition.  In the airplane industry, we define blown flaps as flaps getting air from a power source other than the airstream: from engine bleed air in the case of the F-4.  We'd call Wes's system "slotted flaps".  Here's a piece on slotted flaps: http://cafefoundation.org/v2/pdf_tech/High.Lift/Elsevier.Prog.AS.HighLift.vDam.02.pdf .  On the scale of misuse of technical terms by the stunt community, this is a very minor offense. 

Title: Re: blown flap system
Post by: beercamel on December 30, 2015, 04:43:46 PM

Quote from: Howard Rush on December 28, 2015, 01:46:49 PM

It's just directing airflow.  This is a matter of definition.  In the airplane industry, we define blown flaps as flaps getting air from a power source other than the airstream: from engine bleed air in the case of the F-4.  We'd call Wes's system "slotted flaps".  Here's a piece on slotted flaps: http://cafefoundation.org/v2/pdf_tech/High.Lift/Elsevier.Prog.AS.HighLift.vDam.02.pdf .  On the scale of misuse of technical terms by the stunt community, this is a very minor offense. 

The system in the F-4 was called BLC, Boundary Layer Control.. It worked OK..  but it also has some serious negatives..  The USN F-4's and the USAF F-4C's and F-4D's had it.. It was abandoned in the F-4E..

Title: Re: blown flap system
Post by: Target on December 30, 2015, 04:51:32 PM

What advantage do these style flaps offer? They seem rather complicated to execute.
Thanks in advance.
Happy New Year.
Chris

Title: Re: blown flap system
Post by: tom creasey on December 31, 2015, 07:50:20 AM

Quote from: Chris Behm on December 30, 2015, 04:51:32 PM

What advantage do these style flaps offer? They seem rather complicated to execute.
Thanks in advance.
Happy New Year.
Chris

The advantage is you have no mushing in the turns and less drag on the wing load when flaps move up or down. Your maneuvers are better performed. It is not really complicated once you build your first flap system. To me it is all in fun.

Title: Re: blown flap system
Post by: Target on December 31, 2015, 09:37:07 AM

I know what you mean by all in fun, Tom. I like to build also.
Thanks for the response and Happy New Year.
Regards,
Chris