cmgtech1
Posts: 27
Joined: 6/20/2004
From: Dalton,
GA, USA
Status: offline
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RCNXS - The pumper does not seem to add any additional umph the .91. In fact, there are some non pumped OS .91's that are turning out more power than the pumper. I do have a pumper on my Intruder, but there are lots of folks running the std. .91 on the Intruder and they are not suffering from lack of power through the maneuvers.
To the original poster - the WM Intruder 90 is a fantastic plane and an absolute bargin. The center of gravity as listed in the instruction manual is off by quite a bit. Put the CG right on the main gear, or if you need a little more performance in the point roll maneuvers, move the CG about 1/4" behind the mains. The advice on the horizontal stab settings listed by others is good, but with the center of gravity moved back some, I reduced the amount of negative incidence in my stab to about -.25 degrees. 1/2 degree with the CG on the mains will have you feeling pretty happy and comfortable.
For anyone interested in trying some S.P.A. pattern in the novice class.. put the CG about 1/2 inch in front of the main gear (you'll need to compensate for this by flying with some "up elevator" trim or a good 1/2 degree of negative incidence in the stab). This very slightly nose heavy configuration will make the Intruder really "lock in" during the straight flight out, procedure turn, and straight flight back. By the way.. the tendency for most pilots is to let the plane climb as it is going away from us, and let dive when it's coming toward you. In the procedure turn, concentrate on not allowing the aircraft to climb through the 1st half of the turn, and then don't let it dive through the second half of the turn. The next most common mistake is to come out of the turn too soon, which means that your straight flight out is not on the correct heading. Get these maneuvers consistantly picture perfect, and you'll really be setting yourself up for success.
If you're interested in the Intruder for S.P.A. pattern above the novice class, push that CG back or you'll be fighting the plane through many of the maneuvers. One of the S.P.A expert flyers using the Intruder has his CG more than 1/2 behind the main gear to help in the 8 point rolls. Visit the Senior Pattern website at www.seniorpattern.com and check out the 2007 contest results write ups and pictures if you want to get a taste of how much fun we have at the SPA events.
If you're just wanting to great flying pattern aircraft to sport fly with.. you will still have a winner with the Intruder. She's a pleasure to fly!
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Anyone flying the WM Intruder 90? - 
