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Building Tips and technical articles. => 1/2 A building. => Topic started by: Tom Perry on February 25, 2008, 09:08:23 AM

Title: Some more Bob Mathison builds
Post by: Tom Perry on February 25, 2008, 09:08:23 AM: Bob asked me to put these picture up for him.

The blue one is a half a twister with a Big Mig .049. The blue body yellow winged one is an Excalibur with a Big Mig .061.

The other one is my design with no name. It is powered with a baby bee.

The last one is Molly the dog guarding the twister. LL~

Bob chime in here if I missed anything. :)
Title: Re: Some more Bob Mathison builds
Post by: Joey Mathison 9806 on February 25, 2008, 04:10:33 PM: how long is the lines on the molly
Title: Re: Some more Bob Mathison builds
Post by: Larry Renger on February 25, 2008, 05:41:56 PM: Those all look good. What are the sizes and weights? What line lengths do you intend to use?

The reed engine looks like a Texaco, not a Babe Bee.
Title: Re: Some more Bob Mathison builds
Post by: Tom Perry on February 27, 2008, 04:32:39 PM: Quote from: Larry Renger on February 25, 2008, 05:41:56 PM
Those all look good. What are the sizes and weights? What line lengths do you intend to use?

The reed engine looks like a Texaco, not a Babe Bee.

Actually a Texaco Jr. tank on a Baby Bee. Good eye thogh. :)

At this point in time with all the mixing and matching one can never be sure. LL~
Title: Re: Some more Bob Mathison builds
Post by: Robert Mathison on February 28, 2008, 02:19:58 PM: Larry, the EXCALIBUR 1/2A,

WING IS 33"

THE WEIGHT IS 13.9 OZ

THE LINE LENGHT IS 52'

THE ENGINE IS A BIG MIG .061

THE TWISTER

THE WEIGHT IS 10.4 OZ AND THE WING IS 29''

THE LINE LENGTH IS 52;

THE ENGINE IS A BIG MIG .049

TOM'S DESINE

THE WEIGH 7.25 OZ

THE WING IS 261/2"

THE LINE LENGTH 35" TO 40" WITH A COX .049

BOB
Title: Re: Some more Bob Mathison builds
Post by: Tom Perry on February 29, 2008, 09:55:08 AM: Quote from: Joey Mathison 9806 on February 25, 2008, 04:10:33 PM
how long is the lines on the molly

Not sure of length or diameter but am pretty sure its a monoline. LL~ LL~ LL~
Title: Re: Some more Bob Mathison builds
Post by: Joey Mathison 9806 on February 29, 2008, 05:37:16 PM: yes that sounds like my dad he always did very well with one line
Title: Re: Some more Bob Mathison builds
Post by: Robert Mathison on March 01, 2008, 05:37:51 AM: JOEY, DID YOU EVER RUN THAT AME .049 I SENT YOU? I JUST FOUND [3] MORE NIB .049'S SO LET ME KNOW.
DAD
Title: Re: Some more Bob Mathison builds
Post by: Joey Mathison 9806 on March 01, 2008, 07:00:40 AM: i have been trying to use it on a foam wing combat plane and it is not giving good engine runs always goes lean after about 30 seconds i will continue to play with prop and fuel combos untill i make it happy.
Title: Re: Some more Bob Mathison builds
Post by: Robert Mathison on March 01, 2008, 08:22:46 AM: JOEY, YOU SHOULD TRY A SMALL BLATER TANK, JUST A SLIGHT PRESSURE . YOU COULD TRY A BALLOON TANK AND IT SHOULD RUN OK. DAD
Title: Re: Some more Bob Mathison builds
Post by: Joey Mathison 9806 on March 01, 2008, 01:07:20 PM: dad the foam winged combat plane is using a bladder tank
Title: Re: Some more Bob Mathison builds
Post by: minnesotamodeler on March 01, 2008, 03:56:30 PM: I have found a common problem with Norvels of most any stripe--crankshaft fit is a little too tight. As it heats up (that first 30 sec.) it gets tighter; your engine is not going lean, it's binding up. I actually had one seize in the air; turned OK after it cooled down. I tore several of mine down and lapped the shafts in with toothpaste and an electric drill. Seems to solve the problem, at least so far. Time will tell if I've shortened their lives any.

--Ray
Title: Re: Some more Bob Mathison builds
Post by: Joey Mathison 9806 on March 01, 2008, 08:08:06 PM: thanks ray i will give that a shot