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Author Topic: Design Basics  (Read 783 times)

Offline John Miller

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Design Basics
« on: November 08, 2020, 01:34:46 PM »
Figuring Control ratios:

Let's assume that most bellcranks rotate 45 Degrees in each direction. If we want 45 degrees of flap, the ratio is easy, 1 to 1, but what if you want 30 degrees of flap rotation?

Using simple Algebra we can solve these types of questions.

In this type of problem, we will have 3 out of 4 variables. Usually, these fixed values will be the bellcrank rotation, the flap horn length, and the flap rotation we want. The number we're missing is the bellcrank moment arm.

The 4 attachments are PDF's and are sized for a standard sheet of paper. You can download and print them with your printer if you desire.

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Offline Avaiojet

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Re: Design Basics
« Reply #1 on: November 09, 2020, 05:16:43 AM »
Figuring Control ratios:

Let's assume that most bellcranks rotate 45 Degrees in each direction. If we want 45 degrees of flap, the ratio is easy, 1 to 1, but what if you want 30 degrees of flap rotation?

Using simple Algebra we can solve these types of questions.

In this type of problem, we will have 3 out of 4 variables. Usually, these fixed values will be the bellcrank rotation, the flap horn length, and the flap rotation we want. The number we're missing is the bellcrank moment arm.

The 4 attachments are PDF's and are sized for a standard sheet of paper. You can download and print them with your printer if you desire.

You can also do this with a motion diagram.
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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.


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