Bi Slob - stunt mods

[Dennis Toth]

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

[peabody]

A 38 Special is a great stunt flier

[RK]

More Info on the 38-Special.

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

RK Flyer

[Serge_Krauss]

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 1^o - 2^o 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

[Elwyn Aud]

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.

[john e. holliday]

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.

[55chevr]

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.

[John Stiles]

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.

[Jim Kraft]

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.