50 foot Big Floyd - Page 96 - RC Groups
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Oct 24, 2005, 05:31 AM
Registered User
I haven't seen any giant pink things flying over Madison recently, I'll let you know if I see anything..........
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Oct 24, 2005, 01:05 PM
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I wanna know the payload capacity of the thing, specifically how many kittens it can hold....I wanna rain terror down on the local school kids.
Oct 24, 2005, 01:16 PM
fix-it-up chappie
tolladay's Avatar
You are a sad sick individual, and I thank you for it.
Nov 05, 2005, 09:47 PM
kave_man's Avatar
How is the project coming guys?
Nov 06, 2005, 06:15 AM
Flying for the fun of it
beep684's Avatar
can you show any video of the 50 foot plane flying?
Just as a question, how did all of you guys who were inputing about the wing design etc. learn about designing wings? Experience? Job? School?

Last edited by beep684@hotmail.; Nov 06, 2005 at 06:16 AM. Reason: spelling error
Nov 06, 2005, 10:26 AM
Registered User
Aio_1's Avatar

Are you talking about aerodynamic or structural design?
If you're looking for sources of information on aerodynamics I can perhaps post some links and other sources. Structural design is much simpler in many ways but is also more critical for models (poor aerodynamics will make it fly inefficiently but needs to be really bad to cause serious problems, poor structural design can easily cause a crash). There's lot's of theory available for structural design in general. However because we usually have no accurate data for the loads involved during a flight and because of the unusual materials often used the structural design is often just a matter of judgement based on experience.

Last edited by Aio_1; Nov 06, 2005 at 10:32 AM.
Nov 06, 2005, 10:27 AM
Closed Account
Well, Flybike hasn't posted since Sept. 12th...almost 2 months now....looks like the Dept. of Homeland Security finally caught up with him.
Nov 06, 2005, 11:37 AM
My other car...
noodle's Avatar
Well, I'm guessing Flybike is just busy with school, but I am surprised he hasn't checked in. I'm guessing we'll hear from him during the Thanksgiving holiday, though.
Nov 06, 2005, 03:34 PM
Got shenpa?
flieslikeabeagle's Avatar
Beep, just to add to what Aio1 said - you really only need to know the wing area and models weight to get a quite decent estimate of how slowly it can fly and still make enough lift to stay in the air (i.e., the stall speed). Or turn that around, decide how slowly you want it to land, and that will tell you how much wing area you need for a given model weight.

Astonishingly, you can completely ignore details like the actual airfoil, and still get very usable results for our purposes.

Once you know the stall speed, you know the pitch speed should be two to three times the stall speed. Once you know the pitch speed, you can estimate the thrust from the prop: a magical 100% efficient prop would produce a thrust (at speed) in ounces given by:
Thrust (oz) = 8.2 x power (watts)/pitch speed(mph)

Actual thrust might be 70% or 80% of that number.

So now you know how much power you need to get enough thrust to fly, and you know how much wing area you need, and you know what your model should weigh.

All that remains is to find a prop, gear ratio, motor, and battery that provides that power at that pitch speed, and you're in business.

This method won't make a contest-winning sailplane design, but it will result in something that will fly.

You can use WebOCalc to do the mathematical lifting for you: get it from my RC Groups website, http://flbeagle.rchomepage.com . (Click Software, WebOCalc).

Nov 06, 2005, 05:14 PM
Lance Armstrong- 7 times!
flybike's Avatar

Unfortunately, I do not think there will be enough time during the Thanksgiving holiday to try a second time. I will only be home for a couple days, and in addition there will likely be snow on the ground.

But- there's a chance. We'll see.

I haven't returned David's charger, nor have I sent the gearbox back to Eric. I should get on that..

Nov 06, 2005, 05:20 PM
Registered User
koko76's Avatar
Ready when you are
Nov 07, 2005, 03:05 PM
RC Geek
Scott_NJ's Avatar

Snow on the ground??? You just need some foam skids is all :-)

Nov 07, 2005, 03:51 PM
Lance Armstrong- 7 times!
flybike's Avatar
The gearbox is going in the mail today.

I'm putting the motors and escs in the box too.

Nov 07, 2005, 03:55 PM
Registered User
Minimole's Avatar
So thats the end of the project, seeing as you wont have a power plant...?

Or is it going to be a sloper? lol

Nov 07, 2005, 04:37 PM
Hogster's Avatar
Originally Posted by Minimole
So thats the end of the project, seeing as you wont have a power plant...?
I do hope not .... you can't get this near and not get that baby airborne ...

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