Logo
Builders' Plan Gallery  |  Hip Pocket Web Site  |  Contact Forum Admin  |  Contact Global Moderator
August 23, 2019, 04:45:02 AM *
Welcome, Guest. Please login or register.
Did you miss your activation email?

Login with email, password and session length
 
Home Help Search Login Register
Pages: [1]   Go Down
Print
Author Topic: Four hooks or two  (Read 184 times)
0 Members and 1 Guest are viewing this topic.
flydean1
Gold Member
*****

Kudos: 18
Offline Offline

United States United States

Posts: 936

Topic starter


Ignore
« on: July 08, 2019, 11:59:17 AM »

This applies more to Power models due to their greater weight and flying speed.

I have long theorized that there was a structural advantage to spreading out the load on the wing center section over a wider area than just the center joint.  Moving the rubber bands to either side of the centerline, I thought would ease the strain on DT landings, and the occasional DT under power.

I would build a wing platform that supports the center to either side, and pass dowels or CF rods under the edge to hold the wing.

However, I see that many successful Free Flighters use a pair of hooks passing the rubber bands right over the center joint, or center of wing on flat panel models.

I tried to attach a picture of one of my T-Birds as an example, but I have tried 3 time with no success.

Looking to hear from others on the subject.

So what is it, four hooks or two?
Logged
Konrad
Titanium Member
*******

Kudos: 38
Offline Offline

United States United States

Posts: 2,156


Measure twice cut once



Ignore
« Reply #1 on: July 08, 2019, 01:15:02 PM »

Not sure I understand the question. But we use centerline attachments to lower the drag to increase the performance of the model. I think most of your question with structure would depends on what or how the wing center joint or joiner are implemented.
Drag is what kill performance. Weight kills performance because the added lift required induces drag.

As to loading photos make sure the size of the photo is 400kb or less and use file formats like jpeg. I think there are detail on the site on how to do this.

P.S.
I like to use nylon bolts rather than rubber bands both for aerodynamic concerns and structural reasons. Rubber bands add drag and often cut through the leading edge and trailing edges. Properly sized and torqued nylon bolts will shear with little or no damage to the airframe if the two are designed to separate (not held captive with fairing and such. Rubber bands were a poor idea in the 30's and with the advent of plastics one might want to look at nylon shear bolts for a much more practical solution.
Logged

Cut it twice and it's still too short!
danberry
Gold Member
*****

Kudos: 17
Offline Offline

United States United States

Posts: 952



Ignore
« Reply #2 on: July 08, 2019, 08:09:01 PM »

You're over-thinking things.
Logged
Konrad
Titanium Member
*******

Kudos: 38
Offline Offline

United States United States

Posts: 2,156


Measure twice cut once



Ignore
« Reply #3 on: July 08, 2019, 08:43:50 PM »

Who, myself or Flydean?  Roll Eyes

All the best,
Konrad
Logged

Cut it twice and it's still too short!
danberry
Gold Member
*****

Kudos: 17
Offline Offline

United States United States

Posts: 952



Ignore
« Reply #4 on: July 08, 2019, 11:31:55 PM »

Who, myself or Flydean?  Roll Eyes

All the best,
Konrad

Dean
Logged
Pages: [1]   Go Up
Print
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines Valid XHTML 1.0! Valid CSS!