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Author Topic: rib reinforcment  (Read 16740 times)

Online Lauri Malila

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Re: rib reinforcment
« Reply #50 on: February 05, 2014, 02:20:07 PM »
Hi again Bob.

I did not really mean to comment your foam jig system, it was more to those who use more classical wing jigs.
Another thing; if someone wants to optimize, the cap strips should have a stronger joint with l.e. sheeting than the butt-joint that everybody use. The strips should be recessed into the sheeting so that it has a good shear joint with main spar. Only then the caps can take all the loads they are capable of taking. I guess many of us have noticed how the wing stiffens when tip blocks are glued on. That just indicates that the ribs don't do their job properly.
Of course, our wings are so thick and weight/material volume is not such an issue. In free flight it is a big issue, if just one of about 100 ribs crack, the model becomes unflyable.

Lauri

Offline Bob Hunt

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Re: rib reinforcment
« Reply #51 on: February 05, 2014, 04:28:32 PM »
Good tip, Lauri!  y1 y1

Bob

Offline Allan Perret

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Re: rib reinforcment
« Reply #52 on: February 05, 2014, 04:42:25 PM »

Another thing; if someone wants to optimize, the cap strips should have a stronger joint with l.e. sheeting than the butt-joint that everybody use. The strips should be recessed into the sheeting so that it has a good shear joint with main spar.

Lauri
Do you have a picture or drawing of this, not sure I understand what you mean by recess the strips into l.e. sheeting.
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Offline Avaiojet

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Re: rib reinforcment
« Reply #53 on: February 05, 2014, 05:05:57 PM »
Do you have a picture or drawing of this, not sure I understand what you mean by recess the strips into l.e. sheeting.

My guess is, this is what it would be.

And, of course, the TE also.
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Offline Bob Hunt

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Re: rib reinforcment
« Reply #54 on: February 05, 2014, 07:04:51 PM »
Another way of accomplishing essentially the same thing but with less hassle is to trim the leading edge shells so that they cover approximately two thirds of the C-Tube spars chordwise. That leaves one third purchase for the cap strip. No inletting required.

Bob Hunt 

Offline Curare

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Re: rib reinforcment
« Reply #55 on: February 05, 2014, 07:16:28 PM »
good thinking!
Greg Kowalski
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Offline john e. holliday

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Re: rib reinforcment
« Reply #56 on: February 06, 2014, 09:36:00 AM »
Don't forget the trailing edge also with cap strips.   mw~
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Offline Brett Buck

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Re: rib reinforcment
« Reply #57 on: February 06, 2014, 12:00:06 PM »
Another way of accomplishing essentially the same thing but with less hassle is to trim the leading edge shells so that they cover approximately two thirds of the C-Tube spars chordwise. That leaves one third purchase for the cap strip. No inletting required.

 AND, you don't leave a sharp-edged cut in the LE wood to start a crack later.

   You absolutely DO NOT want to do what is shown in the drawing.

    Brett

Offline Avaiojet

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Re: rib reinforcment
« Reply #58 on: February 06, 2014, 12:19:04 PM »
AND, you don't leave a sharp-edged cut in the LE wood to start a crack later.

   You absolutely DO NOT want to do what is shown in the drawing.

    Brett


I just want to make this "perfectaly clear" that the drawing isn't in any way MY recommendation on how to recess capstrips. The drawing was only in response to what was described.

Lauri Malila who, unless my drawing is incorrect, recommended this construction.

Brett makes sense, in that to cut a recess, there's two extra corners that could possibly crack.

Nice observation, Brett!

Edited, spelling error.
« Last Edit: February 06, 2014, 01:07:57 PM by Avaiojet »
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If you're Trolled, you know you're doing something right.  Alpha Mike Foxtrot. "No one has ever made a difference by being like everyone else."  Marcus Cordeiro, The "Mark of Excellence," you will not be forgotten. "No amount of evidence will ever persuade an idiot."- Mark Twain. I look at the Forum as a place to contribute and make friends, some view it as a Realm where they could be King.   Proverb 11.9  "With his mouth the Godless destroys his neighbor..."  "Perhaps the greatest challenge in modeling is to build a competitive control line stunter that looks like a real airplane." David McCellan, 1980.

Offline Dick Pacini

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Re: rib reinforcment
« Reply #59 on: February 06, 2014, 12:58:27 PM »
Actually, Brett made sense.  He has made sense since his first posts on this board. y1
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Offline Avaiojet

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Re: rib reinforcment
« Reply #60 on: February 06, 2014, 01:09:53 PM »
Actually, Brett made sense.  He has made sense since his first posts on this board. y1

Dick,

I heard NH had ploice dressed and armed as the Military would be. Like test marketing.

Is this true?
Trump Derangement Syndrome. TDS. 
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Amazing how ignorance can get in the way of the learning process.
If you're Trolled, you know you're doing something right.  Alpha Mike Foxtrot. "No one has ever made a difference by being like everyone else."  Marcus Cordeiro, The "Mark of Excellence," you will not be forgotten. "No amount of evidence will ever persuade an idiot."- Mark Twain. I look at the Forum as a place to contribute and make friends, some view it as a Realm where they could be King.   Proverb 11.9  "With his mouth the Godless destroys his neighbor..."  "Perhaps the greatest challenge in modeling is to build a competitive control line stunter that looks like a real airplane." David McCellan, 1980.

Offline Dick Pacini

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Re: rib reinforcment
« Reply #61 on: February 06, 2014, 01:56:11 PM »
Dick,

I heard NH had ploice dressed and armed as the Military would be. Like test marketing.

Is this true?

We don't have ploice in NH. mw~
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Offline Howard Rush

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Re: rib reinforcment
« Reply #62 on: February 06, 2014, 02:30:33 PM »
A friend from Brooklyn said that NH is a noice ploice.
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Offline Gil Mc Millan

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Re: rib reinforcment
« Reply #63 on: February 11, 2014, 04:58:53 PM »
Are shear webs in the trailing edge also ? I never did find a picture that clearly shows that.
Gil Mc Millan
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Offline Chris Wilson

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Re: rib reinforcment
« Reply #64 on: February 11, 2014, 06:57:17 PM »
Actually, Brett made sense.  He has made sense since his first posts on this board. y1
In fact he makes so much sense one could call him 'Sensei!'
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