Thread Tools
Old Jan 30, 2013, 09:10 AM
minduim is offline
Find More Posts by minduim
Registered User
Discussion

CG limits for a transport airplane model


Hi,

I want to built an airplane model capable of carrying a payload of seeds and dropping it during flight. The problem is that I don't know how the center of gravity will be affected by this.

How real airplanes are designed so they can carry stuff and drop it (say, like the Canadair CL-215) without becoming unstable after they drop the payload? Is it a function of the tailsize, to allow for a bigger CG range?
Sign up now
to remove ads between posts
Old Jan 30, 2013, 10:09 AM
kcaldwel is online now
Find More Posts by kcaldwel
Advancing the Schmilblick!
kcaldwel's Avatar
They carry the droppable payload arranged on the CG, so there is minimal CG change when the payload is dropped. The water bomber has the tank's centre of mass centred on the CG, and I imagine it is designed to drain so that the CG is maintained.

The stab is fairly large to allow a reasonable CG range, and have the power to handle the moment changes form the big flaps, scooping water, etc.

Kevin
Old Jan 30, 2013, 10:14 AM
biber is offline
Find More Posts by biber
Needs brain lubrication
biber's Avatar
Just make sure the CG of the cargo mass is placed within the flyable CG range of the cargo model.
Then you can drop the cargo inflight and maintain a flyable CG location.

If you have plenty of horizontal tail area far enough behind the wing, the flyable range of CG will be rather broad, allowing for a broader range of cargo location while maintaining a flyable CG.

biber


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Question Transporting LiPo batteries by airplane RemoteRider Batteries and Chargers 29 Dec 31, 2014 11:36 AM
Yippee! Xheli.com 20% Off Selected Models ! Limited Time Only! Nitro_Nancy Hot Online Deals 0 Jan 23, 2013 01:49 PM
Discussion Transporting a rc helicopter on an airplane... Real Airplane like United Airlines helicub81 Electric Heli Talk 8 Oct 09, 2010 12:04 AM