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thorpdrvr
 Post subject: A little tailwind
PostPosted: Thu Nov 12, 2015 5:18 pm 
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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


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Hagle347
 Post subject: Re: A little tailwind
PostPosted: Thu Nov 12, 2015 7:44 pm 
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Joined: Tue Oct 26, 2010 3:42 pm
Posts: 566
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So this is your thorp with the new 0-320 power.... Nice numbers


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Rich Brazell
 Post subject: Re: A little tailwind
PostPosted: Thu Nov 12, 2015 8:27 pm 
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Joined: Wed Oct 21, 2009 12:33 pm
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Location: Jamul, CA (San Diego area)
Bernie : Did you end up getting the engine from Aero Sport Power ? :P

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lance38dt
 Post subject: Re: A little tailwind
PostPosted: Thu Nov 12, 2015 8:35 pm 
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Joined: Thu Aug 05, 2010 3:22 pm
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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


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thorpdrvr
 Post subject: Re: A little tailwind
PostPosted: Thu Nov 12, 2015 11:11 pm 
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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.

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Bernie Fried
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thorpdrvr
 Post subject: Re: A little tailwind
PostPosted: Sat Nov 21, 2015 1:40 am 
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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 9795 times ]


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


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jrevens
 Post subject: Re: A little tailwind
PostPosted: Sat Nov 21, 2015 1:53 am 
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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!

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John Evens
Arvada, Colorado

T-18 N71JE (sold)
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Bill Williams
 Post subject: Re: A little tailwind
PostPosted: Sat Nov 21, 2015 6:01 am 
Bernie, you sure your not in an A320?


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campipilot
 Post subject: Re: A little tailwind
PostPosted: Wed Sep 21, 2016 1:38 am 
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Joined: Fri Aug 26, 2016 10:29 am
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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.


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