Thorp Air Command - T18.net

Supporting Owners, Builders and Pilots of the Thorp T-18 and its variants.
It is currently Thu Jun 21, 2018 8:48 am

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 9 posts ] 
Author Message
thorpdrvr
 Post subject: A little tailwind
PostPosted: Thu Nov 12, 2015 5:18 pm 
Jr. Member
Jr. Member

Joined: Wed Oct 21, 2009 12:35 pm
Posts: 83
Images: 4
Location: USA
Was up flying yesterday evening and got a pic of the ground speed. It's in mph, but is the highest I have seen in my bird. Could have got to about 270 if I would have pushed the speed up a little higher in the descent. Was indicating 185 mph at 10,500 feet at time of pic. Where are these tailwinds when I'm going somewhere?!!!

Bernie Fried
N18XS


Image


Top
 Profile Personal album  
 
Hagle347
 Post subject: Re: A little tailwind
PostPosted: Thu Nov 12, 2015 7:44 pm 
Sr. Member
Sr. Member
User avatar

Joined: Tue Oct 26, 2010 3:42 pm
Posts: 388
Images: 19
Location: USA
So this is your thorp with the new 0-320 power.... Nice numbers


Top
 Profile Personal album  
 
Rich Brazell
 Post subject: Re: A little tailwind
PostPosted: Thu Nov 12, 2015 8:27 pm 
Hero Member
Hero Member

Joined: Wed Oct 21, 2009 12:33 pm
Posts: 2847
Images: 64
Location: Jamul, CA (San Diego area)
Bernie : Did you end up getting the engine from Aero Sport Power ? :P

RB O0


Top
 Profile Personal album  
 
lance38dt
 Post subject: Re: A little tailwind
PostPosted: Thu Nov 12, 2015 8:35 pm 
Full Member
Full Member

Joined: Thu Aug 05, 2010 3:22 pm
Posts: 143
Images: 0
Location: USA
Bernie, I know you had an O-290, when you changed the engine did you use the old mount? I'm just thinking ahead .

Lance


Top
 Profile Personal album  
 
thorpdrvr
 Post subject: Re: A little tailwind
PostPosted: Thu Nov 12, 2015 11:11 pm 
Jr. Member
Jr. Member

Joined: Wed Oct 21, 2009 12:35 pm
Posts: 83
Images: 4
Location: USA
Yes, I got the engine from Aerosport Power. It is a Superior 320 with crankshaft and rods swapped out, so it is a 340. The plane is probably 10 to 15 mph faster in cruise than with the 290. I am still breaking it in, so don't have real good speed numbers or fuel burn down yet.

Definitely a noticeable increase in acceleration and climb, and some increase in speed. Probably won't affect speed, but I don't have the spinner dome on yet.

I used the straight mount just like the 290 used (not dynafocal). The older narrow deck 320's are often straight mount (conical) cases. I think some of the newer wide deck Lycoming engines are also conical (maybe the 320b2b if I remember correctly), but not nearly as common as dynafocal. You can get new ECI and Superior engines with either mount style.

_________________
Bernie Fried
N18XS


Top
 Profile Personal album  
 
thorpdrvr
 Post subject: Re: A little tailwind
PostPosted: Sat Nov 21, 2015 1:40 am 
Jr. Member
Jr. Member

Joined: Wed Oct 21, 2009 12:35 pm
Posts: 83
Images: 4
Location: USA
Was up again with a little more tailwind. Was getting 265 to 270 mph in cruise/level flight and got to 314 mph in descent. The new goal is 350!
Attachment:
20151117_145621 (640x360).jpg
20151117_145621 (640x360).jpg [ 148.88 KiB | Viewed 2682 times ]


https://www.youtube.com/watch?v=CVzAKaeYo3Y


Top
 Profile Personal album  
 
jrevens
 Post subject: Re: A little tailwind
PostPosted: Sat Nov 21, 2015 1:53 am 
Sr. Member
Sr. Member
User avatar

Joined: Thu Oct 22, 2009 10:13 pm
Posts: 705
Location: USA
That's pretty cool Bernie!

One time coming home from Butte, Montana with my daughter in the right seat, we saw around 255 mph heading East towards Bozeman. I was throttled back too, because it got a little turbulent, & she was starting to feel sick. We did get home to Denver in record time that day though!

_________________
John Evens
Arvada, Colorado

T-18 N71JE (sold)
Kitfox 7 SS N27JE


Top
 Profile  
 
Bill Williams
 Post subject: Re: A little tailwind
PostPosted: Sat Nov 21, 2015 6:01 am 
Sr. Member
Sr. Member

Joined: Thu Oct 22, 2009 6:26 am
Posts: 755
Images: 0
Location: USA
Bernie, you sure your not in an A320?


Top
 Profile Personal album  
 
campipilot
 Post subject: Re: A little tailwind
PostPosted: Wed Sep 21, 2016 1:38 am 
Newbie
Newbie

Joined: Fri Aug 26, 2016 10:29 am
Posts: 27
So what do you think your normal cruise TAS is? Do you have a constant speed? If not what RPM are you running at cruise?

My bird does about 175 knots TAS at a bit over 2600 RPM 10,500' fixed pitch IO320 modified engine.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 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:  
cron

[ Time : 0.087s | 14 Queries | GZIP : On ]