Author Topic: Do BiSlobs scale up or down well? (Read 4650 times)

dave siegler · « **on:** March 01, 2016, 09:31:03 AM »

I have seen larger and smaller ones.

How big for .60 sized one?

How small for a .061 sized one?

what works well and what does not?

Want to build one that is big and impressive.

Motorman · « **Reply #1 on:** March 01, 2016, 09:42:38 AM »

if the engine has twice the power make it twice as big.

MM

Dane Martin · « **Reply #2 on:** March 01, 2016, 09:51:52 AM »

Dan Banjock flew this monster. I think it's a 30cc gas engine

pat king · « **Reply #3 on:** March 01, 2016, 09:59:36 AM »

Remember, wing area is the true size as far as power is concerned. An airplane twice as large has four times the wing area. For double the power the wingspan should be 1.4 to 1.5 times as large. A Ringmaster has a 42" wingspan, a 60 size Ringmaster has a 63" wingspan.

Pat

Dave Royer · « **Reply #4 on:** March 01, 2016, 10:27:03 AM »

I don't know if he has plans or not but Scott Riese has an excellent .60 size Bi Slob. I'd talk to him.

Dave

Steve Helmick · « **Reply #5 on:** March 01, 2016, 05:30:04 PM »

Quote from: Dave Royer on March 01, 2016, 10:27:03 AM

I don't know if he has plans or not but Scott Riese has an excellent .60 size Bi Slob. I'd talk to him.

Dave

Scott came to mind for me, also. He did a nice demo flight with one a long time ago...standard size, I think. At a NW Regionals? It's the only BiSlob flight I've ever witnessed, but it was clear that he had done that stuff before!

Steve

wwwarbird · « **Reply #6 on:** March 01, 2016, 06:35:06 PM »

Quote from: pat king on March 01, 2016, 09:59:36 AM

Remember, wing area is the true size as far as power is concerned. An airplane twice as large has four times the wing area. For double the power the wingspan should be 1.4 to 1.5 times as large. A Ringmaster has a 42" wingspan, a 60 size Ringmaster has a 63" wingspan.

Pat

Now there's an interesting thought Pat, how about a 1/2A or .15 size 'Slob kit?

pat king · « **Reply #7 on:** March 01, 2016, 08:07:19 PM »

Does anyone have a set of BiSlob plans they would loan me?

Pat

Roger Vizioli · « **Reply #8 on:** March 01, 2016, 08:33:20 PM »

Quote from: wwwarbird on March 01, 2016, 06:35:06 PM

Now there's an interesting thought Pat, how about a 1/2A or .15 size 'Slob kit?

We have a 1/2 A and ~ .15 size in our club. Both have flown, a few years ago, will try to get some info on same.

Roger V

Dane Martin · « **Reply #9 on:** March 01, 2016, 08:33:45 PM »

Quote from: pat king on March 01, 2016, 08:07:19 PM

Does anyone have a set of BiSlob plans they would loan me?

Pat

I think so. I'll check. Larry Marx might have some also. Man oh man, a golden bee powered slob would be the bees knees.... Ha!

Serge_Krauss · « **Reply #10 on:** March 02, 2016, 09:06:18 AM »

Airplanes tend to perform better when scaled up, but not as well when scaled down. However, with our power or thrusts compared to model size and weight, we have some advantages. The thing to note though is speed. If you plan to change scales AND speeds, remember that power required to overcome aerodynamic drag varies as the cube of speed. That means, for instance, that in the full-scale aircraft world, where there is not an overabundance of power, it would take eight times the power to double the speed of a plane. Conversely, in scaling down, you can skimp on power, so long as there is enough to climb adequately. 'just food for thought.

So what was Dan's choice of engine for the big BiSlob? His big Flite Streak had, what? 'about 1.2 cu in?

SK

Ara Dedekian · « **Reply #11 on:** March 02, 2016, 09:08:14 AM »

   Pat

   I have a set of BiSlob plans from the Flying Models plans service. I'll send them if you still need a set.

   Ara

pat king · « **Reply #12 on:** March 02, 2016, 09:16:51 AM »

Ara,
Please send them to:
Pat King
5133 w Jason Dr.
Monee, IL 60449

I will send them back to you and send you a full size .pdf scan of the plans.

Thanks, Pat

FLOYD CARTER · « **Reply #13 on:** March 02, 2016, 10:00:51 AM »

They're sort of fun to watch the first time. But it gets old in a hurry.

FC

Jeff Traxler · « **Reply #14 on:** March 02, 2016, 10:33:17 AM »

So what was Dan's choice of engine for the big BiSlob? His big Flite Streak had, what? 'about 1.2 cu in?

SK
[/quote]

Serge,I think he has a big ST in it.The 2500??

john e. holliday · « **Reply #15 on:** March 02, 2016, 11:23:10 AM »

More fun to watch when you have Jim Lee and the Late Marvin Denny(Big Iron), trying to out do each other in the same circle at the same time. Sure wish someone had gotten a video of that.

dave siegler · « **Reply #16 on:** March 02, 2016, 11:36:53 AM »

Quote from: pat king on March 01, 2016, 08:07:19 PM

Does anyone have a set of BiSlob plans they would loan me?

Pat

There is a set of rough DXF files plans floating around I will check at home.

Ken Burdick · « **Reply #17 on:** March 02, 2016, 11:55:23 AM »

Be sure to call it "BIG FAT SLOB"

kenneth cook · « **Reply #18 on:** March 02, 2016, 02:29:08 PM »

Dan's FLite Streak has a 1.08. The Bi Slob had a 1.08 equally until it proved not enough engine. It actually self destructed. The Super Tiger he's now using is the 2500. The engine required a lot of tail weight. The giant Bi-slob will not hover as of yet. Issues with the stock carb has presented to be problematic. He recently changed that but now as it approaches the hang, it wants to come into the circle. He just really hasn't had the time to invest into tuning it properly. He just has a full plate.

Elwyn Aud · « **Reply #19 on:** March 02, 2016, 03:25:43 PM »

Quote from: john e. holliday on March 02, 2016, 11:23:10 AM

More fun to watch when you have Jim Lee and the Late Marvin Denny(Big Iron), trying to out do each other in the same circle at the same time. Sure wish someone had gotten a video of that.

dave siegler · « **Reply #20 on:** March 02, 2016, 06:24:21 PM »

bi slob drawing

wwwarbird · « **Reply #21 on:** March 02, 2016, 08:28:12 PM »

Quote from: FLOYD CARTER on March 02, 2016, 10:00:51 AM

They're sort of fun to watch the first time. But it gets old in a hurry.

FC

I think flying would be much more fun than watching. I don't think I've ever seen a 'Slob pilot walk off the circle without a big fat grin.

EddyR · « **Reply #22 on:** March 03, 2016, 09:45:40 AM »

I have seen three sizes fly and the original size fly the best. I got bored with mine pretty quick but kept it for 10+ years to bring it out for club events.
Finally sold it.

john e. holliday · « **Reply #23 on:** March 03, 2016, 11:04:35 AM »

Thank you so much Elwyn, that sure brings back memories. And as some one just stated, you just help but grin/smile after flying a Bi-Slob, even if you dork it.

pat king · « **Reply #24 on:** March 08, 2016, 01:03:03 PM »

I have downloaded the plans Dave directed us to. I now have a set of the paper plans thanks to Ara. I will design a 60 size airplane, 900 square inches 36 1/4" span. I will evaluate how to design a 1/2A size that is able to perform like the original. It may end-up being an airplane for .061 engines.

Thanks to everyone for their help, Pat