"1/2 A" & "1/8 A" airplanes These are the small ones...more popular now than ever.

Where should the landing gears be???

Reply
Old 02-12-2014, 08:27 AM
  #1
shd3920
Thread Starter
 
Join Date: Aug 2007
Location: Pittsfield, MA
Posts: 1,607
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Where should the landing gears be???

I am building a low-wing from scratch and need to know where to place the main landing gears.
Should the wheels be located underneath the second or third open bay from the center?
How far back from the leading edge should they be?
It will be a tricycle setup and the wing is 34" span X 6 1/2" wide, and I am adding ailerons with two servos.

Thank you.
Attached Thumbnails
Click image for larger version

Name:	SAM_0460.JPG
Views:	75
Size:	603.6 KB
ID:	1967841   Click image for larger version

Name:	SAM_0462.JPG
Views:	67
Size:	594.4 KB
ID:	1967842  
shd3920 is offline  
Reply With Quote
Old 02-12-2014, 12:26 PM
  #2
LouisB
 
Join Date: Feb 2005
Location: Heidelberg, SOUTH AFRICA
Posts: 159
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

When an aircraft takes off, it rotates around the centre of gravity (CoG or CG). So you should place your main landing gear just a little behind the CG, towards the tail. Not too much else the aircraft will battle to get airborne. The nose wheel would obviously be installed at the nose.

Last edited by LouisB; 02-12-2014 at 12:32 PM.
LouisB is offline  
Reply With Quote
Old 02-12-2014, 01:20 PM
  #3
shd3920
Thread Starter
 
Join Date: Aug 2007
Location: Pittsfield, MA
Posts: 1,607
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

Thank you Louis. Would the 2nd bay from the center be good?
shd3920 is offline  
Reply With Quote
Old 02-12-2014, 07:38 PM
  #4
flyingagin
 
flyingagin's Avatar
 
Join Date: Feb 2009
Location: Modesto, Ca
Posts: 2,251
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

I would go with the third bay. More lateral stability is all ways a good thing. But farther out might give you some problems and with a hadrd landing you could be looking at a failed wing. But the third is safe on all counts.

Ken
flyingagin is online now  
Reply With Quote
Old 02-13-2014, 09:36 AM
  #5
BMatthews
Moderator
 
BMatthews's Avatar
 
Join Date: Oct 2002
Location: Chilliwack, BC, CANADA
Posts: 12,256
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default

The farther out the wheels are the easier it is for touching clumps or other obstacles with one side to kick the model out of line. But too close in and the model can be upset by side wind gusts easier.

Because this is a trike gear model I'd suggest that your landing gear mount blocks or plate would be glued directly to the main spar. As for spacing the second picture suggests to me that having the wire leg drop down at the second wing rib from the center with the stub axle for the wheel bending outward from that would put the wheels just a little into the third rib bay. And that looks about right to my eyes. It's wide enough for stability and narrow enough that you shouldn't see the model get kicked around too badly by stuff on the ground.
BMatthews is offline  
Reply With Quote
Reply


Thread Tools
Search this Thread
Display Modes

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



All times are GMT -8. The time now is 08:22 PM.