Thorp Air Command - T18.net

Supporting Owners, Builders and Pilots of the Thorp T-18 and its variants.
It is currently Tue Nov 13, 2018 4:16 pm

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 12 posts ] 
Author Message
t18joe
 Post subject: Long or Short Gear
PostPosted: Sun Apr 29, 2018 9:58 pm 
Newbie
Newbie

Joined: Sun May 15, 2011 7:33 pm
Posts: 11
Location: USA
How does one determine if the aircraft has the long or short gear legs?
Thanks


Top
 Profile  
 
James Grahn
 Post subject: Re: Long or Short Gear
PostPosted: Sun Apr 29, 2018 11:01 pm 
Hero Member
Hero Member

Joined: Sat Oct 24, 2009 7:16 pm
Posts: 1017
Images: 0
Location: USA
Take a look at the 515 drawing and compare measurements.
Cubes


Top
 Profile Personal album  
 
t18joe
 Post subject: Re: Long or Short Gear
PostPosted: Tue May 01, 2018 11:00 pm 
Newbie
Newbie

Joined: Sun May 15, 2011 7:33 pm
Posts: 11
Location: USA
Thanks Cubes, so if the measurement match the print, the ldg is the short gear Correct?


Top
 Profile  
 
James Grahn
 Post subject: Re: Long or Short Gear
PostPosted: Wed May 02, 2018 9:20 am 
Hero Member
Hero Member

Joined: Sat Oct 24, 2009 7:16 pm
Posts: 1017
Images: 0
Location: USA
Correct. If you have T18 drawings. If you have S18 drawings, it is long gear. Good question.
Cubes


Top
 Profile Personal album  
 
Jeff J
 Post subject: Re: Long or Short Gear
PostPosted: Thu May 03, 2018 6:40 am 
Sr. Member
Sr. Member

Joined: Wed Aug 31, 2016 8:18 am
Posts: 419
Images: 0
Location: eastern OK
Is anyone running the S-18 gear legs on a T-18? Longer gear on a longer fuselage makes sense to me but longer gear on a short fuselage makes me wonder if the change in wheel position in relation to the center of weight and shortening the distance between the mains and the tail could alter the ground handling characteristics.

_________________
Thorp T18
O-320-B3B (160 HP)
68x74 Sterba Propeller

"The joke in aviation is, 'If you want to make a million, you'd better start with £10m.' " -Bruce Dickinson


Top
 Profile Personal album  
 
SHIPCHIEF
 Post subject: Re: Long or Short Gear
PostPosted: Thu May 03, 2018 9:42 am 
Sr. Member
Sr. Member

Joined: Tue Nov 29, 2011 9:05 pm
Posts: 429
Location: USA
I have replaced my original T-18 landing gear with S-18 gear from Cubes. It fit right on, including the engine mount. I was surprised how well it fit, with only a small amount of grinding and file work.
The legs are a bit longer, I had to make new gear leg fairings and brake lines.
Sorry, I have not flown it yet.

_________________
Scott Emery
EAA Chapter 326
T-18 N18TE


Top
 Profile  
 
James Grahn
 Post subject: Re: Long or Short Gear
PostPosted: Thu May 03, 2018 10:21 am 
Hero Member
Hero Member

Joined: Sat Oct 24, 2009 7:16 pm
Posts: 1017
Images: 0
Location: USA
I have long gear on my T. It works great. The longer gear, combined with a Trusty tail spring allows you to land much slower. The Trusty tail spring puts the tail wheel 9 inches further aft and lowers the tail by two inches. All of these things combined to make landing much easier and more controllable.
Cubes


Top
 Profile Personal album  
 
Jeff J
 Post subject: Re: Long or Short Gear
PostPosted: Thu May 03, 2018 1:27 pm 
Sr. Member
Sr. Member

Joined: Wed Aug 31, 2016 8:18 am
Posts: 419
Images: 0
Location: eastern OK
It is hard for me to get an accurate indicated landing speed because the indication fluctuates when I get slow but I land around 50 mph no matter which attitude I touch down in. How much slower is possible by extending the gear length?

I should note that mine has extensions installed that move the wheels down without changing the station location. I have the original flat spring tailgear with a Homebuilders fork and tailwheel. The airplane is quick to respond on the ground but I don’t consider it squirrelly.

_________________
Thorp T18
O-320-B3B (160 HP)
68x74 Sterba Propeller

"The joke in aviation is, 'If you want to make a million, you'd better start with £10m.' " -Bruce Dickinson


Top
 Profile Personal album  
 
James Grahn
 Post subject: Re: Long or Short Gear
PostPosted: Thu May 03, 2018 11:28 pm 
Hero Member
Hero Member

Joined: Sat Oct 24, 2009 7:16 pm
Posts: 1017
Images: 0
Location: USA
Not sure I could throw a number at you. I will say that when I three point, I no longer hit the tail wheel first. The wing still stalls at the same speed, but the airplanes attitude in a three point is right where it needs to be.
Cubes


Top
 Profile Personal album  
 
Jeff J
 Post subject: Re: Long or Short Gear
PostPosted: Fri May 04, 2018 9:39 am 
Sr. Member
Sr. Member

Joined: Wed Aug 31, 2016 8:18 am
Posts: 419
Images: 0
Location: eastern OK
Except for maybe a couple of times when I first got the airplane, I don't think I have ever hit the tail first on landing. I do tend to wheel land most of the time so maybe my 3-point landings qualify as wheel landings. I land when the airplane quits flying (not necessarily stalled but not enough lift to fly either) and the airspeed difference between having the tail up and having the tail down at that point is very small with my airplane.

_________________
Thorp T18
O-320-B3B (160 HP)
68x74 Sterba Propeller

"The joke in aviation is, 'If you want to make a million, you'd better start with £10m.' " -Bruce Dickinson


Top
 Profile Personal album  
 
fytrplt
 Post subject: Re: Long or Short Gear
PostPosted: Fri May 04, 2018 10:07 am 
Sr. Member
Sr. Member
User avatar

Joined: Tue Oct 20, 2009 8:07 pm
Posts: 821
Images: 2
Location: Lakeland, Florida, USA
I have 2800 hrs on my T-18 with the longer gear. Adding the Trusty tail spring only made it better. Long gear on a T-18 is a non-issue.

_________________
Bob Highley
N711SH
SN 835
KLAL


Top
 Profile Personal album  
 
1albee
 Post subject: Re: Long or Short Gear
PostPosted: Sat May 05, 2018 5:54 am 
Sr. Member
Sr. Member

Joined: Sat Oct 31, 2015 6:58 pm
Posts: 164
Images: 0
The long gear does get you a small amount of additional prop clearance, something I needed for where I hanger.
Phil
118BC


Top
 Profile Personal album  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 12 posts ] 

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

[ Time : 0.078s | 12 Queries | GZIP : On ]