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Building Tips and technical articles. => 1/2 A building. => Topic started by: Larry Renger on July 01, 2007, 03:41:39 PM

Title: Baby Clown ARF progress
Post by: Larry Renger on July 01, 2007, 03:41:39 PM
I have finally flown the Baby Clown ARF.  I used a Medallion .049 and a 6x3 black C*x prop (new mold).  42.5'lines, my Ultimate 1/2A handle.  I am not totally thrilled with the engine run, but will put on a KK pressure backplate (the one with the ball-check valve) to even out the engine run.  The wing has a slight warp, but the plane did insides and outsides just fine.  There is a photo posted in the ARF section.  I see a lot of potential here!
Title: Re: Baby Clown ARF progress
Post by: Roger Vizioli on July 01, 2007, 05:22:31 PM
Larry,
Will follow your progress on this one.
My .049 Norvel needs a home.
While at the Brodak Fly In, strolling through the Hobby shop, not planning to buy anything (though I did each of the five times I went in there  y1 ), I bought a "beam mount" (also White) ARF Baby Clown.
Roger
Title: Re: Baby Clown ARF progress
Post by: Larry Renger on July 02, 2007, 10:34:34 AM
With a Norvel .049, you probably will have to go out to 45' lines.  Also, at least a 1 oz. tank.  It may then become noseheavy.  This isn't a big plane (135 sq.in compared to 180 sq.in. for my Sky Sport) so you really have to pay attention to weight.  Mine is at 6.6 ounces currently.
Title: Re: Baby Clown ARF progress
Post by: Roger Vizioli on July 02, 2007, 08:44:13 PM
Yep!
Thanks Larry!
Roger
Title: Re: Baby Clown ARF progress
Post by: Robert Mathison on July 04, 2007, 11:13:16 AM
HI LARRY, I have a 28" TWISTER with a BIG MIG .049 and fly it on 52' lines with out any problem, any thing less than 52' is not that much fun

           BOB
Title: Re: Baby Clown ARF progress
Post by: Larry Renger on July 06, 2007, 09:41:13 AM
Sounds nifty, got photos?  Weight, area, materials used?  Tell all!   #^
Title: Re: Baby Clown ARF progress
Post by: Robert Mathison on July 06, 2007, 05:12:11 PM
LARRY,  I will take a set of photos and post them.


                 BOB
Title: Re: Baby Clown ARF progress
Post by: Willis Swindell on July 07, 2007, 04:27:23 PM
Larry the weight is10.0  OZ,THE WING is 29", the area is 167 SQ" the body is 18" long  the ENG. is a big mig.049.
 send to stuka stunt 1/2A forum for Robert Mathison H^^
Title: Re: Baby Clown ARF progress
Post by: Roger Vizioli on July 07, 2007, 04:53:31 PM
Ooops!   :o
Roger
Title: Re: Baby Clown ARF progress
Post by: Larry Renger on July 07, 2007, 05:57:27 PM
With that weight and wing area, it should do a clean pattern, probably on 40' lines or so.  The C*x Super Stunter Me-109 was 165 sq.in. and weighed 10.5 ounces, and didn't have flaps.  It could just be coaxed through a pattern, but the maneuvers tended to be oversize.  Your Twister should be much better.

By comparison, the Baby Magician in Flying Models some years ago had 230 sq" and weighed 10.5 ounces.  It would fly a competitive (to anything!) pattern.

The Sky Sport, just published in Flying Models, has a 180 sq.in. wing and weighs 8.5 ounces.  No flaps, though.  Bart K flew it to well over 500 points in the recent Knight's joust on both flights.  This was in competition with .40 size Profile models!

Lee Strickland scaled down the Ringmaster to 250 sq.in. and came in at 11 ounces.  I have yet to personally see it fly, but have had reports that it is excellent.

One thing people don't realize while scaling down models is that the wood sizes need to be reduced from the scaled down size!  If a 60% model scales down to a 1/4 x 1/8 spar, use a 3/16 x 3/32 size.  The models get relatively stronger as you shrink them, and the weight MUST be reduced.
Title: Re: Baby Clown ARF progress
Post by: Larry Renger on July 08, 2007, 04:12:46 PM
Further flight testing of the Clown.

Antone Kephart and I put in about 5 flights on the model.  I finally tracked the engine problem down!  I had added a shim under the cylinder whenever I built the engine in order to get the exhaust port position I like.  That turns out to have changed the timing and compression ratio enough to give unsteady runs.

The warp seems to be cured.  Some noseweight needed to be added (handle spacing and control horn spacing are where they should be, so weight was the clue).

Turning ability is excellent, landings are wretched due to the forward gear, even though mine is as far back as I thought I could get away with.

With the Medallion .049, the 3/4 oz. tank is sufficient with the plane on 42.5' lines.

More news as it happens!
Title: Re: Baby Clown ARF progress
Post by: Larry Renger on July 30, 2007, 09:49:11 AM
I have flown the B Clown a couple more weekends, and it is really getting to be in the groove.  I now have the handle setting perfect, insides and outsides seem to match well, and the engine run is superb!  Happy camper time.   #^

It is pretty fast, and needed noseweight, so I may go to a bigger tank and move from 42.5' lines to 45'. 

I seem to have not posted a photo, so here one is.