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General control line discussion => Open Forum => Topic started by: Scott Richlen on January 01, 2015, 07:00:29 PM

Title: Speaking of LA-46s....
Post by: Scott Richlen on January 01, 2015, 07:00:29 PM

There is a nice article on the LA-46 in the November issue of Aero Modeler.  What a nice magazine (first commercial model magazine since FM went under that actually has interesting, useful, and readable articles.)  Their discussion of the engine somewhat explains why so many people using so many variations manage to find "stunt happiness"

Scott

Title: Re: Speaking of LA-46s....
Post by: Dwayne on January 02, 2015, 06:17:03 AM

Yup they'l run in most any set up, I have mine on a pipe, plastic tank with pressure no uniflow to mess with and it is the most rock solid IC set up I have.
For the money they can't be beat.   y1

Title: Re: Speaking of LA-46s....
Post by: Scott Richlen on January 02, 2015, 07:43:47 AM

Dwayne:

Good looking profile!  Is it a USA-1?  Or?  Is it per Werwage's plan or did you shrink it a little?  What are the numbers? 

Title: Re: Speaking of LA-46s....
Post by: Dwayne on January 02, 2015, 06:41:52 PM

Thanks Scott.
It's a Dick Sarpolus Challenger, uses a Sig super chipmunk wing that I put USA1 style tips on and yes it does look good if I do not say so myself.  ;D

Title: Re: Speaking of LA-46s....
Post by: Scott Richlen on January 02, 2015, 07:20:50 PM

wingspan?  flying weight?

I think that it really looks good!

Title: Re: Speaking of LA-46s....
Post by: Dwayne on January 03, 2015, 08:34:30 AM

Quote from: Scott Richlen on January 02, 2015, 07:20:50 PM

wingspan?  flying weight?

I think that it really looks good!

Yes it is a good looking design Dick really did a good job designing it.  The super chipmunk has a wing span of 53.5" and 570 sq. with the tips I added it's now 54.5". I used .5oz glass on the fuse sides so with that the pipe and wheel pants it comes in just a tick under 48 oz. but I'm sure it could be done a bit lighter,  even at that weight it's still a rock solid flier. You can still get plans on ebay. Or maybe someone here might have a set?

Title: Re: Speaking of LA-46s....
Post by: Geoff Goodworth on January 04, 2015, 04:55:48 PM

In the article on the LA-46 in the November issue of Aero Modeller, Maris Dislers talks about the transfer ports. He says—

'I doubt that Doctor Schnuerle would have acknowledged the arrangement as meeting his idea for loop scavenging. Rather, combustion residues on the piston crown suggest the system works more like the reverse-flow pattern seen in Cox engines.'

Can anybody explain this reverse flow in Cox engines for me, please?

Title: Re: Speaking of LA-46s....
Post by: Curare on January 04, 2015, 05:29:21 PM

Can anyone post the article? I'd be very interested to see what Maris Dislers wrote.

Title: Re: Speaking of LA-46s....
Post by: Carl Cisneros on January 04, 2015, 06:29:00 PM

here are a few diagrams of intake systems used in 2 stroke motors.