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| A little tailwind http://t18.net/thorpforum/viewtopic.php?f=8&t=7857 |
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| Author: | thorpdrvr [ Thu Nov 12, 2015 5:18 pm ] |
| Post subject: | A little tailwind |
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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| Author: | Hagle347 [ Thu Nov 12, 2015 7:44 pm ] |
| Post subject: | Re: A little tailwind |
So this is your thorp with the new 0-320 power.... Nice numbers |
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| Author: | Rich Brazell [ Thu Nov 12, 2015 8:27 pm ] |
| Post subject: | Re: A little tailwind |
Bernie : Did you end up getting the engine from Aero Sport Power ?  RB 
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| Author: | lance38dt [ Thu Nov 12, 2015 8:35 pm ] |
| Post subject: | Re: A little tailwind |
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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| Author: | thorpdrvr [ Thu Nov 12, 2015 11:11 pm ] |
| Post subject: | Re: A little tailwind |
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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| Author: | thorpdrvr [ Sat Nov 21, 2015 1:40 am ] |
| Post subject: | Re: A little tailwind |
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 [ 148.88 KiB | Viewed 12893 times ] https://www.youtube.com/watch?v=CVzAKaeYo3Y |
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| Author: | jrevens [ Sat Nov 21, 2015 1:53 am ] |
| Post subject: | Re: A little tailwind |
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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| Author: | Bill Williams [ Sat Nov 21, 2015 6:01 am ] |
| Post subject: | Re: A little tailwind |
Bernie, you sure your not in an A320? |
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| Author: | campipilot [ Wed Sep 21, 2016 1:38 am ] |
| Post subject: | Re: A little tailwind |
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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