| Thorp Air Command - T18.net http://t18.net/thorpforum/ |
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| AIRSPEED HUNTING http://t18.net/thorpforum/viewtopic.php?f=21&t=7777 |
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| Author: | Robert5 [ Wed May 20, 2015 3:54 am ] |
| Post subject: | AIRSPEED HUNTING |
HI, I AM NEW TO THE FORUM. I BUILT MY T18 AND IT HAS 400HRS ON THE CLOCK. A GREAT PLANE AND WOULD NOT TRADE IT FOR AN RV. IN CRUISE ABOUT 145KTS AND FASTER IT SOMETIMES HUNTS FORE AND AFT ABOUT ONCE PER SECOND. YOU CAN FEEL IT IN YOUR SEAT BUT NO RPM OR AIRSPEED CHANGE. THE ENGINE HAS CARBY RAM AIR AND FIXED PITCH SENSENICH PROP. I HAVE SELECTED CARBY HEAT BUT THE RPM DROP MASKS THE HUNTING. THE FWD ACCELERATION WOULD HAVE TO BE A FEW KNOTS. THERE IS NO NOTICABLE VIBRATION CHANGE. MAYBE SOMEONE IN THE FORUM HAS COME ACROSS THIS PROBLEM. BOB. AUSTRALIA. VH-WKV. |
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| Author: | thorpdrvr [ Wed May 20, 2015 10:43 am ] |
| Post subject: | Re: AIRSPEED HUNTING |
I have felt this after power changes and occasionally in turbulence. It is fuel sloshing forward and aft in main fuel tank. If tank is full, it won't do it. Fill your tank full and see if you can duplicate the surging feeling. Bernie Fried N18xs |
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| Author: | Robert5 [ Sun Jun 07, 2015 2:58 am ] |
| Post subject: | Re: AIRSPEED HUNTING |
Hi Bernie, thankyou for the help, I will try 3/4 full tank to replicate the problem. I mostly only fly with about 50lts which is why the hunting doesn't happen much. Bob Veale. |
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| Author: | jrevens [ Sun Jun 07, 2015 6:10 pm ] |
| Post subject: | Re: AIRSPEED HUNTING |
thorpdrvr wrote: I have felt this after power changes and occasionally in turbulence. It is fuel sloshing forward and aft in main fuel tank. If tank is full, it won't do it. Fill your tank full and see if you can duplicate the surging feeling. Bernie Fried N18xs Hi Bernie, I never would have thought of that... you are so perceptive! Gonna' be at OSH? Take care! |
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| Author: | thorpdrvr [ Sun Jun 07, 2015 9:58 pm ] |
| Post subject: | Re: AIRSPEED HUNTING |
Hi John, Melva and I plan on going to Oshkosh. Don't know if I'll have the Thorp there or not. Putting a different engine in and not sure if I'll have it ready in time. Hope to see you up there! Bernie N18XS |
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