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General control line discussion => Open Forum => Topic started by: dave siegler on March 01, 2016, 09:31:03 AM
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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.
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if the engine has twice the power make it twice as big.
MM
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Dan Banjock flew this monster. I think it's a 30cc gas engine
https://youtu.be/n4N_aaHLxtI
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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
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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
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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! y1 Steve
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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? S?P
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Does anyone have a set of BiSlob plans they would loan me?
Pat
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Now there's an interesting thought Pat, how about a 1/2A or .15 size 'Slob kit? S?P
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
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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!
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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
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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
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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
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They're sort of fun to watch the first time. But it gets old in a hurry.
FC
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So what was Dan's choice of engine for the big BiSlob? His big Flite Streak had, what? 'about 1.2 cu in?
SK
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Serge,I think he has a big ST in it.The 2500??
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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.
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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.
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Be sure to call it "BIG FAT SLOB"
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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.
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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.
https://www.youtube.com/watch?v=opLIo7tCyOs
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bi slob drawing
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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. ;D
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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. 010!
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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.
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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