Go Back  RCU Forums > RC Airplanes > RC Scale Aircraft
Reload this Page >

Balancing Scale Torpedos

RC Scale Aircraft Discuss rc scale aircraft here (for giant scale see category above)

Balancing Scale Torpedos

Old 12-16-2023, 05:42 PM
Thread Starter
My Feedback: (15)
redtail's Avatar
Join Date: Oct 2002
Location: Alexandria, VA
Posts: 2,625
Received 6 Likes on 6 Posts
Default Balancing Scale Torpedos

I am building a scale WWII bomber that drops a torpedo. Question is, how do you balance, find the C/G, of the torpedo so that when it is dropped, it will fly parallel with the ground until impact? Many thanks guys. Happy Holidays..
Old 12-17-2023, 09:12 AM
mgnostic's Avatar
Join Date: Jan 2003
Location: Kamay, TX
Posts: 1,591
Received 84 Likes on 72 Posts

You are probably only going to get a decent compromise between dropping smoothly and falling in a level attitude. I'm pretty sure that even a full scale torpedo will drop nose down if it falls far enough. It will partly depend on how well the fins stabilize the torpedo. It also depends on the weight of the torpedo itself. A very light torpedo ie.an empty cardboard tube, might turn into an unstable lifting body if the CG is far enough aft and the dropping airplane is flying fast enough. A torpedo with an aft CG is also going to be less stable, wobbling as it falls. You don't mention your intended drop height. If it isn't going to fall very far, the wobble and thus the CG becomes less critical. The best advice I can give is to make up four or five disposable cardboard tubes with different CG's, maybe even as far back as 50% or more, weight them to match your intended scale torpedo and see how they drop.
Old 12-19-2023, 04:05 AM
scale only 4 me
My Feedback: (158)
scale only 4 me's Avatar
Join Date: Jan 2002
Location: Avon Lake, OH
Posts: 10,380
Received 51 Likes on 49 Posts

A torpedo was dropped at around 50' off the water,, they never flew at level flight for more than the spit second they were released

Most RC bombs get into a wobble right away because they are too light to penetrated the air,, if you want a bomb or torpedo for that matter to fly more like a full scale version, you need to add enough weight (mass) to overcome the drag of the surface area

Last edited by scale only 4 me; 12-19-2023 at 04:10 AM.
Old 12-19-2023, 07:57 AM
allanflowers's Avatar
Join Date: Sep 2004
Location: San Diego, CA
Posts: 1,798
Received 41 Likes on 31 Posts

It occurs to me that the torpedo's moment of inertia is a key to keeping it stable as it drops. This implies a very light tube with weights AT EACH END. Of course it still needs the CG to be properly forward.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.