Thorp Air Command - T18.net

Supporting Owners, Builders and Pilots of the Thorp T-18 and its variants.
It is currently Tue Jan 19, 2021 7:32 pm

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 204 posts ]  Go to page Previous  1 ... 9, 10, 11, 12, 13, 14  Next
Author Message
leewwalton
PostPosted: Tue Aug 25, 2020 3:10 pm 
Administrator
Administrator
User avatar

Joined: Tue Oct 20, 2009 4:09 pm
Posts: 1649
Images: 107
Location: Houston, TX
No an angle valve motor is not a good idea ... does not fit, heavy, cowl ends up looking either really fat or just plane strange

_________________
Lee Walton
Houston, TX
N51863,N118LW
KEFD


Top
 Profile Personal album  
 
Ryan Allen
PostPosted: Tue Aug 25, 2020 4:25 pm 
Sr. Member
Sr. Member
User avatar

Joined: Wed Oct 21, 2009 6:10 pm
Posts: 954
Images: 0
Location: Louisiana
Whew...I'm looking at an angle valve. Glad I asked. Thank you.


Top
 Profile Personal album  
 
Hagle347
PostPosted: Tue Aug 25, 2020 6:22 pm 
Sr. Member
Sr. Member
User avatar

Joined: Tue Oct 26, 2010 3:42 pm
Posts: 492
Images: 19
Location: USA
Hey Ryan, there’s quite a number of Thorps out there with o-360’s. The stock 360 has more torque than an 0-320, however....I went with a IO-320, it’s lighter than the O-360 which means you typically won’t require lead in the aft fuselage for proper weight and balance. ( my dad’s Thorp had 13 lbs)
And if one were to go with bigger compression ratio pistons, you could get close to the 180 hp number with less weight. I went with 9:1 and am showing about 178hp. There’s a bunch of 0-320 guys with 10:1.
I know you’ll find the right balance for your airplane.


Top
 Profile Personal album  
 
leewwalton
PostPosted: Tue Aug 25, 2020 7:36 pm 
Administrator
Administrator
User avatar

Joined: Tue Oct 20, 2009 4:09 pm
Posts: 1649
Images: 107
Location: Houston, TX
Terry he's talking about an angle valve motor ... not recommended!

_________________
Lee Walton
Houston, TX
N51863,N118LW
KEFD


Top
 Profile Personal album  
 
Hagle347
PostPosted: Tue Aug 25, 2020 7:56 pm 
Sr. Member
Sr. Member
User avatar

Joined: Tue Oct 26, 2010 3:42 pm
Posts: 492
Images: 19
Location: USA
Guess I didn’t do a good job of explaining those as options....


Top
 Profile Personal album  
 
leewwalton
PostPosted: Tue Aug 25, 2020 9:51 pm 
Administrator
Administrator
User avatar

Joined: Tue Oct 20, 2009 4:09 pm
Posts: 1649
Images: 107
Location: Houston, TX
I believe Ryan’s flying Thorp has an 0-360. Ryan you can as Terry pointed out tweak any of these motors .. I have a parallel valve 0-360 that’s rated at 217 hp on Wendells plane in my garage. I will say that hp on a 1000 lb Thorp is quite the ride.

_________________
Lee Walton
Houston, TX
N51863,N118LW
KEFD


Top
 Profile Personal album  
 
Ryan Allen
PostPosted: Wed Aug 26, 2020 6:08 am 
Sr. Member
Sr. Member
User avatar

Joined: Wed Oct 21, 2009 6:10 pm
Posts: 954
Images: 0
Location: Louisiana
That's all very good info. I appreciate it. I do have a 180hp 0-360 on my flying Thorp, but I did not know if a 200hp 0-360 was different, and I'm glad I asked. As a novice builder, I want to stay away from anything that will cause me to have to modify anything. I do want an 0-360 for this project, but would consider an 0-320 under the right circumstances.


Top
 Profile Personal album  
 
James Grahn
PostPosted: Wed Aug 26, 2020 6:50 pm 
Hero Member
Hero Member

Joined: Sat Oct 24, 2009 7:16 pm
Posts: 1235
Images: 0
Location: USA
I think the (I)O-320 is the perfect motor for a Thorp. It is lighter (as Retired Terry said) and can be pretty powerful. I have a 192HP IO-320 waiting for the weather to cool off so I can install it. Light means fast.
Cubes


Top
 Profile Personal album  
 
Ryan Allen
PostPosted: Wed Aug 26, 2020 7:10 pm 
Sr. Member
Sr. Member
User avatar

Joined: Wed Oct 21, 2009 6:10 pm
Posts: 954
Images: 0
Location: Louisiana
I'm assuming yall are running CS props with these 320's? If so, I'm guessing I could use the same CS prop that is recommended for the RV-6/-7? Just in case... :P


Top
 Profile Personal album  
 
James Grahn
PostPosted: Thu Aug 27, 2020 12:52 pm 
Hero Member
Hero Member

Joined: Sat Oct 24, 2009 7:16 pm
Posts: 1235
Images: 0
Location: USA
Not sure what they use. I can find out. We have a set of props that Hartzell makes for us. They can be slightly modified with scimitar blades. Incidentally, this modification eliminates the rpm avoidance band.
If you would like a new Hartzell, let me know. I am a dealer and can beat most prices including Vans.
Cubes


Top
 Profile Personal album  
 
Jeff J
PostPosted: Thu Aug 27, 2020 2:04 pm 
Sr. Member
Sr. Member

Joined: Wed Aug 31, 2016 8:18 am
Posts: 570
Images: 0
Location: eastern OK
I am running a fixed pitch wood prop on my O-320. Newer constant speed props may be better but my experience with metal CSP on other airframes suggests a person is better off without the extra weight. It does depend some on what a person wants to do with the 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  
 
Ryan Allen
PostPosted: Sun Sep 06, 2020 9:31 am 
Sr. Member
Sr. Member
User avatar

Joined: Wed Oct 21, 2009 6:10 pm
Posts: 954
Images: 0
Location: Louisiana
I am trying to decide whether to use a brake master cylinder on my firewall, or use the all in one unit at the pedals. I have the all in one units on my flying T18. I refill the brake fluid by loosening a fitting by the wheels. A master cylinder reservoir on the firewall seems much easier to refill. Is there a reason I would want to use the all in one unit over the firewall mounted brake fluid reservoir?


Top
 Profile Personal album  
 
jrevens
PostPosted: Mon Sep 07, 2020 10:26 am 
Sr. Member
Sr. Member
User avatar

Joined: Thu Oct 22, 2009 10:13 pm
Posts: 779
Location: USA
Hi Ryan,
The only disadvantage I can see to using a remote reservoir is the additional tubing and fittings... things get a little more “busy” around the cylinders & pedals. Also have to penetrate the firewall & have a spot to mount the reservoir. The simplicity of the built-in reservoirs is nice, but they can be a PIA to check & fill, especially in an airplane like the T-18.

_________________
John Evens
Arvada, Colorado

T-18 N71JE (sold)
Kitfox 7 SS N27JE


Top
 Profile  
 
Ryan Allen
PostPosted: Mon Sep 07, 2020 5:33 pm 
Sr. Member
Sr. Member
User avatar

Joined: Wed Oct 21, 2009 6:10 pm
Posts: 954
Images: 0
Location: Louisiana
thanks John. Since those are the issues, I'm thinking I'll put in the reservoir. I like to make things easy to maintain where I can.


Top
 Profile Personal album  
 
Ryan Allen
PostPosted: Sat Oct 31, 2020 8:06 am 
Sr. Member
Sr. Member
User avatar

Joined: Wed Oct 21, 2009 6:10 pm
Posts: 954
Images: 0
Location: Louisiana
Just to save myself some possible aggravation later, I wanted to ask if this is the proper order of installation for attaching the axle/wheel pant bracket/brake torque plate to the landing gear. I attached a photo showing what I think is the correct order of installation.

Attachment:
Resized_20201031_075605.jpeg
Resized_20201031_075605.jpeg [ 345.88 KiB | Viewed 402 times ]


Top
 Profile Personal album  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 204 posts ]  Go to page Previous  1 ... 9, 10, 11, 12, 13, 14  Next

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 : 2.063s | 14 Queries | GZIP : On ]