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Author Topic: Bi Slob - stunt mods  (Read 2953 times)

Offline Dennis Toth

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Bi Slob - stunt mods
« on: December 07, 2013, 08:43:31 AM »
Guys,
Have some time to think about a fun ship for next year and though a biplane could be fun. Seems the old Bi Slob could be a quick build but to actually fly the pattern would need some mods. My thoughts are: reduce engine off-set to 1/4 deg; put the leadout guide in the normal 3/8 - 1/2" back of the CG; reduce rudder off-set to zero; use a 4" bellcrank; reduce control throws to 30 deg; adjust tip weight to normal amounts; use 3/16" balsa for tail surfaces.

I've seen some Bi Slobs with some very nice paint schemes and it could be a neat take-a-part. What ya think?

Best,       DennisT

Offline peabody

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Re: Bi Slob - stunt mods
« Reply #1 on: December 07, 2013, 09:15:48 AM »
A 38 Special is a great stunt flier

Offline RK

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Re: Bi Slob - stunt mods
« Reply #2 on: December 07, 2013, 09:36:17 AM »
More Info on the 38-Special.

I am also looking for a Stunt Model for the smaller 09-19 engines.

RK Flyer
If you come to a fork in the road,,,,Take it!

Offline Serge_Krauss

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Re: Bi Slob - stunt mods
« Reply #3 on: December 07, 2013, 09:52:17 AM »
I've only watched Bi-Slobs, but I think you can do this. It's pretty draggy. So I think you need a heftier engine than a Fox, for sure, and perhaps a slightly different ratio of stab to elevator chords. I don't know off-hand what the horizontal tail size is, but 3/16" sounds a bit thin to me. I think that 1o - 2o of out-thrust is, OK if you use it. 1/4-degree is hard to measure! You'll probably go a bit further back on line rake, but with adj. leadouts, you'd do well. Otherwise, how about 3/4"? There are some very experienced Bi-Slob builder/fliers here; maybe someone has converted one already.

SK

Offline Elwyn Aud

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Re: Bi Slob - stunt mods
« Reply #4 on: December 07, 2013, 06:17:57 PM »
Dave Ek modded one a few years back for normal stunt. Don't know what all he changed but if I remember correctly he was running an LA-46 with a heavy hub. If I remember correctly only the top flap was connected. The bottom flap just flopped in the breeze.

Offline john e. holliday

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Re: Bi Slob - stunt mods
« Reply #5 on: December 08, 2013, 07:34:35 AM »
Well, I put my Bi-Slob thru most of the pattern.   The old Fox .35 Stunt was too lean for hanging.  You ever done a wing over into the wind.   It was so slow going over the top.   But, mine needs a bigger tank for the pattern.
John E. "DOC" Holliday
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Shawnee, KANSAS  66203
AMA 23530  Have fun as I have and I am still breaking a record.

Offline 55chevr

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Re: Bi Slob - stunt mods
« Reply #6 on: December 08, 2013, 11:26:37 AM »
I flew my Bi Slob only once this past summer and it was definitely a different experience.  I have a lot of experience with sensitive maneuverable combat ships and it was more sensitive than a Mongoose or Voodoo.  I think that the flap to elevator ratio has to be reduced to 1/2 of what is recommended for 3D Bi Slob flight.  More engine power and less engine offset would also be required.  I was thinking that maybe a 4 stroke would help tame it for more stunt type flying.  I think that 3-1/2" in handle spacing would be also required.
Joe Daly

Offline John Stiles

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Re: Bi Slob - stunt mods
« Reply #7 on: December 09, 2013, 08:21:45 AM »
This one flies somewhat better than your garden variety of bi-slob. But there's not much in the way of plans for it, I was bored one year and scratch built it. It has a different airfoil than most[ie flat bottoms] and really flies well with the McCoy (type 21) .35, a little faster than a bi-slob, but fun, none the less.
John Stiles             Tulip, Ar.

Offline Jim Kraft

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Re: Bi Slob - stunt mods
« Reply #8 on: December 09, 2013, 09:44:30 AM »
Hey John; Very cool Slobmaster. You are not going to see another one like that at the field every day. For fun flying we need more of this kind of inovation.
Jim Kraft


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Tags: bislob  biplane