Go Back  RCU Forums > RC Airplanes > Beginners
Reload this Page >

Got my LT-40 completed

Notices
Beginners Beginners in RC start here for help.

Got my LT-40 completed

Old 09-26-2010, 03:29 PM
  #1  
shd3920
Thread Starter
 
Join Date: Aug 2007
Location: Pittsfield, MA
Posts: 1,610
Likes: 0
Received 0 Likes on 0 Posts
Default Got my LT-40 completed

Now just gotta get a spinner for it, the right size prop (any ideas? Magnum .46), get it balanced, have a professional check it out.
I may take the aileron servo out and lock the ailerons and learn on 3-channel first.
Attached Thumbnails Click image for larger version

Name:	Jh17248.jpg
Views:	9
Size:	175.9 KB
ID:	1507129   Click image for larger version

Name:	Ql32931.jpg
Views:	8
Size:	160.5 KB
ID:	1507130   Click image for larger version

Name:	Kp33320.jpg
Views:	8
Size:	150.3 KB
ID:	1507131   Click image for larger version

Name:	Ga77208.jpg
Views:	7
Size:	163.2 KB
ID:	1507132   Click image for larger version

Name:	Zk67971.jpg
Views:	7
Size:	158.0 KB
ID:	1507133   Click image for larger version

Name:	Ul79593.jpg
Views:	10
Size:	205.4 KB
ID:	1507134   Click image for larger version

Name:	Hk89490.jpg
Views:	8
Size:	173.8 KB
ID:	1507135   Click image for larger version

Name:	Nm42968.jpg
Views:	6
Size:	182.1 KB
ID:	1507136  

Old 09-26-2010, 03:32 PM
  #2  
shd3920
Thread Starter
 
Join Date: Aug 2007
Location: Pittsfield, MA
Posts: 1,610
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Got my LT-40 completed

Closeups
Attached Thumbnails Click image for larger version

Name:	Ro41734.jpg
Views:	9
Size:	150.8 KB
ID:	1507153   Click image for larger version

Name:	Rn39273.jpg
Views:	7
Size:	119.7 KB
ID:	1507154   Click image for larger version

Name:	Hm23364.jpg
Views:	7
Size:	132.0 KB
ID:	1507155   Click image for larger version

Name:	Xr45872.jpg
Views:	11
Size:	152.4 KB
ID:	1507156   Click image for larger version

Name:	Bm74890.jpg
Views:	11
Size:	100.4 KB
ID:	1507157   Click image for larger version

Name:	Ul79848.jpg
Views:	7
Size:	113.8 KB
ID:	1507158   Click image for larger version

Name:	Gi85192.jpg
Views:	9
Size:	94.0 KB
ID:	1507159   Click image for larger version

Name:	Ed10363.jpg
Views:	8
Size:	79.5 KB
ID:	1507160  

Click image for larger version

Name:	Lj82730.jpg
Views:	7
Size:	83.0 KB
ID:	1507161  
Old 09-26-2010, 03:59 PM
  #3  
gene6029
 
gene6029's Avatar
 
Join Date: Sep 2007
Location: wilson, NC
Posts: 1,208
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Got my LT-40 completed

Nice work! Before i would fly it on 3 channels only , I'd leave it like you have it, but reduce the throws on the ailerons if you must. Get into the habbit of useing them, you wont be flying many 3 channel planes as you progress. I started out on single channel radios, & progressed to two & 3 channel stuff back in the day. I would have loved to start out with 4 channels, just my 2 cents. Once again nice job ya did there. Best wishes on flying it.......Gene
Old 09-26-2010, 04:28 PM
  #4  
red head
 
Join Date: Feb 2005
Location: Zephyrhills, FL
Posts: 2,102
Likes: 0
Received 1 Like on 1 Post
Default RE: Got my LT-40 completed

Nice job !! Please, DON'T lock the ailerons and try to fly it as a 3 channel. It is a super plane as a 4 channel and you won't be sorry keeping it that way. ENJOY !!! RED
Old 09-26-2010, 05:03 PM
  #5  
Top_Gunn
My Feedback: (6)
 
Join Date: Jun 2005
Location: Granger, IN
Posts: 2,127
Likes: 0
Received 2 Likes on 1 Post
Default RE: Got my LT-40 completed

I don't understand what it is you'd gain by using only three channels. The only possible advantage might be that at very slow speeds (just above stall) the LT-40 isn't very responsive to ailerons. But that's not a huge deal, and it's good to learn to use a little rudder in your slow-speed turns from the beginning.
Old 09-26-2010, 05:18 PM
  #6  
goirish
Senior Member
 
goirish's Avatar
 
Join Date: Dec 2005
Location: Litchfield, MI
Posts: 5,130
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Got my LT-40 completed

That plane will not fly good using only rudder. At least mine would not. I did have ailerons on mine but I tried using only rudder and the thing was very mushy, it might not get you out of trouble if you needed to. Just my 2c
Old 09-26-2010, 06:20 PM
  #7  
mike109
Senior Member
 
mike109's Avatar
 
Join Date: Jul 2004
Location: Dubbo, New South Wales, AUSTRALIA
Posts: 1,484
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Got my LT-40 completed

G'day I have Kadet Seniors which were designed as three channel planes (no aileron) and an LT 40.

I would not fly the LT-40 as a three channel plane.

It does not have the dihedral of the Kadet Senior which is what makes the Senior such a good three channel plane.

The LT flies fine as designed.

Prop for a two stroke 46? I would start with an 11 x 6 or if it floats too much on landing 11 x 5. They do tend to float which is what makes them good trainers. They can fly very very slowly if needed.

As it is a trainer, I would probably use a Master Airscrew K series prop (the older ones) as they are tougher and more likely to survive a prop strike. APC seem to be more fragile though they do work better but this is a trainer and absolute power is not really a consideration but longevity and reliability are.

Mine has an extremely elderly Saito 45 Mk II which has the high lift cam from a 56. It flies it really well. I think I am using an 11.5 x 5 Bolly prop. (When you get too many planes, it can be hard to remember!)
Old 09-26-2010, 06:36 PM
  #8  
Augie11
Senior Member
 
Join Date: Sep 2005
Location: Berthoud, CO
Posts: 839
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Got my LT-40 completed

A 10x7 or 11x6 prop should do the trick. I'd go with the 11x6 on an LT 40. You're not looking for speed.

Leave the ailerons active. She will fly much better with them. Once you're comfortable with her you can try flying her with just the rudder leaving the ailerons still connected. You will actually find that the LT will fly better using both ailerons and coordinated rudder in the turns.

Good luck with the maiden flite!
Old 09-26-2010, 06:52 PM
  #9  
JohnBuckner
My Feedback: (1)
 
JohnBuckner's Avatar
 
Join Date: Dec 2001
Location: Kingman, AZ
Posts: 10,441
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Got my LT-40 completed

First some thoughts on how an airplane is controlled by just rudder/elevator as opposed to rudder/aileron/elevator.

To be able to turn the airplane successfully and control it there must be dihedral effect present it takes considerably more dihedral to controll with just rudder. An airplane with ailerons can be controlled without any dihedral.

Ever wonder why all airplanes intended for Rudder/elevator always have much more dihedral than those that also have aileron?

One perfect example is the kaydet which you have an interest. Look at the Senior Kaydet kit. It was intended for rudder/elevator and it has exactly twice the dihedral of the arf version which was intended for full house rudder/elevator/aileron.

When the fellows convert the kit version with ailerons and do not reduce dihedral it always results in extremly poor roll response.

It also is true If one were to fly the arf version with rudder/elevator only without increasing dihedral then roll control would be very poor it could even be non existant if the wings had been flattened as is so popular.

Your LT 40 was never intended and likely has insufficient dihedral for good roll control on rudder/elevator and certain to be difficult to fly as such as hinted at by the other responders.

You really need to reconsider this whole idea with the equipment you have or be certain to have much trouble and bunch more posting about it.

John
Old 09-27-2010, 03:45 PM
  #10  
red head
 
Join Date: Feb 2005
Location: Zephyrhills, FL
Posts: 2,102
Likes: 0
Received 1 Like on 1 Post
Default RE: Got my LT-40 completed

After I read your post about locking the ailerons I had a chance to fly an LT 40 and I played around with just using the rudder. What a DOG, it doesn't like just rudder and elevator. Your choice but I think you are going to be SORRY if you TRY to go that route. Besides, you will want a full house set up later so why not learn on one ??? Very few people fly 3 channel any more and most instructors feel it's better to start with ailerons then if you want, try 3 channel. ENJOY !!! RED
Old 09-27-2010, 04:36 PM
  #11  
JohnBuckner
My Feedback: (1)
 
JohnBuckner's Avatar
 
Join Date: Dec 2001
Location: Kingman, AZ
Posts: 10,441
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Got my LT-40 completed

Indeed adding or removing ailerons without the corresponding appropriate increase or decrease in dihedral is a bad idea and can even be a disasterous idea.

Hmmm how is this for really gumming up the logic? Here is one of my favorite traners:

John
Attached Thumbnails Click image for larger version

Name:	Mk25253.jpg
Views:	9
Size:	35.3 KB
ID:	1507742  
Old 09-27-2010, 04:40 PM
  #12  
DeferredDefect
Senior Member
 
DeferredDefect's Avatar
 
Join Date: Nov 2009
Location: , ON, CANADA
Posts: 974
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Got my LT-40 completed

Awesome plane!
In my mind, the Kadet series are the best trainers available!
Old 09-27-2010, 05:22 PM
  #13  
CGRetired
My Feedback: (1)
 
CGRetired's Avatar
 
Join Date: Sep 2004
Location: Galloway, NJ
Posts: 8,999
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Got my LT-40 completed

What's that, John? An inverted flight trainer?

Kidding, of course.. nice looking plane!

A B-52 looks like that on the ground, too!! I was looking for wheels on the wing-tips.

CGr.
Old 09-27-2010, 05:33 PM
  #14  
cutaway
Senior Member
 
Join Date: Jun 2007
Location: Lake Worth, FL
Posts: 1,009
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Got my LT-40 completed

Unless you want a hot-rod, go with a 4" or 5" pitch prop probably between 10 1/2" and 11" in diameter. Diameter the engine can turn without overheating, misbehaving, crappy idle/etc will be significantly affected by variables like blade width and general blade design.

ex. a 9x8 pylon racing prop loads an engine much less than a Rev-Up 9x8 "W" wide blade.
Old 09-28-2010, 11:12 AM
  #15  
captjckirk
Senior Member
 
Join Date: Jun 2002
Location: West Des Moines, IA
Posts: 114
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Got my LT-40 completed

LT-40, a very versatile airplane, I have built 4 thru the years, and now have the ARF. A Magnum 46 is the perfect engine up front. When you graduate into more safistcated airplanes hold on to to your "40"and put a set of Planefun floats on it. The 46 engine will do fine with the floats. A real blast!!!!!!!
Old 09-28-2010, 04:03 PM
  #16  
JohnBuckner
My Feedback: (1)
 
JohnBuckner's Avatar
 
Join Date: Dec 2001
Location: Kingman, AZ
Posts: 10,441
Likes: 0
Received 0 Likes on 0 Posts
Default RE: Got my LT-40 completed


I was looking for wheels on the wing-tips.

OK
Attached Thumbnails Click image for larger version

Name:	Kh17730.jpg
Views:	9
Size:	137.8 KB
ID:	1508112   Click image for larger version

Name:	Yd82697.jpg
Views:	8
Size:	123.9 KB
ID:	1508113   Click image for larger version

Name:	Ny26078.jpg
Views:	9
Size:	115.5 KB
ID:	1508114   Click image for larger version

Name:	Zb60660.jpg
Views:	7
Size:	140.4 KB
ID:	1508115  

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 - Do Not Sell My Personal Information -

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.