HeliTB
Posts: 1203
Joined: 9/14/2006
From: Fort Washington,
MD, USA
Status: offline
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Okay All, I'm ready to report my maiden flight from yesterday. Weather conditions were overcast about 90F degrees, winds about 10-13 mph cross winds.
My Setup:
OS AX .55 w/11x7P and stock muffler turning about 12.8k on the bench, probably 13k in the air. I wanted to see what the stock muffler did before I put on the tuned Ultrathrust pipe shown in my earlier post above.
Hitec Analog servos all around. HS475 on Ailerons, HS325 Throttle/Steering/Retract Valve, HS225 on the Rudders and one HS635 for the Elevator. Using 20lbs Leeder line and #2 sleeves(fishing stuff) for Pull-Pull on the Nose wheel.
Robart 520w1 Railmount Retracts w/struts from HobbyCitee (City). Retracts also have quick disconnects on the wings air tube, since they are removable.
Hangar 9 2-1/2" Pro-lite wheels
Futaba 2.4GHz R608FS 8-Channel receiver, powered by a A123 2300mAh battery.
Ch1 - Rt Aileron
Ch2 - Elevator
Ch3 - Throttle
Ch4 - Rt Rudder
Ch5 - Retract Valve
CH6 - Lt Aileron
CH7 - Lt Rudder
CH8 - Steering/Nose Wheel
Ch1 and CH6 - Flaperons of course
Ch7 is mixed to Ch4 as Slave at 100%
CH8 is mixed to CH4 as well but 30%, also mixed on the Retract Switch so when the retracts are up the Sterring/Nose wheel is not active. Only active when Retract switch is off.
As you can see no Y's needed. Servo Extensions used (2) Aileron 12", (2) Rudder 18", (1) Elevator 18". Looking back I should have used 18" on the Ailerons and 24" on the Rud/Ele.
C of G - I used 10-1/4" or 265mm for my Bobcat which is slightly nose heavy, probably due to the nose wheel retract.
AUW 7.4 lbs
Flight Report
OS 55 AX fired on the first shot at factory setting and purred like a kitten. We then twinked/leaned the low end needle for a little more throttle response. Once that was doen we headed for the runway. Me being an above the knee amputee (Motorcycle accident 3 yrs ago) I needed the help of my good friend James (JBEN, checkout out his Giant Super Sportster here on RCU, really!!! He a master builder in my eyes) to get the running Bobcat off the bench (subsquent starts will be on the ground). Taxied up the runway, look back the wind sock to see which runway to use, lined up, full throttle, boy does that thing move. Ran about 150 to 200 feet and pull back full elevator (not needed) and the Bobcat launched into the air with the nose straight up like it was a rocket, this is not good. Quickly began levelling out so that I trim the Bobcat. It took about 7 clicks of left aileron and 6 clicks of up elevator (remember slightly nose heavy) and she was flying level. All I heard form behind me, "Boy is that thing fast." That was with the retracts down. I need to dial a little more expo on the controls, I'm at about 50% I will go to about 70%. My good friend, JBEN, says okay that looks great let's get her down so we won't have to dead stick her (new engine first flight), I thought great idea. Begin my line up approaches. Did this about 4 to 5 times to judge the speed and distance I needed to land. Remember the crosswinds. On my final approach I was lined and looking good, I was about 10-15 feet off the deck. I committed a no-no, the Bobcat was moving so fast on landing I thought I was going to miss the runway so I helped it down by giving a down elevator input. When I got about 5 feet I decided that down input was too much, by the time I gave up it was on the ground. The front strut shaft got bent, the right main retract got ripped out and the left main was about to be ripped out. Good news no damage to the plane, not one sratch. I assessed the damage to the gear, the right main rail blocks came out clean, so they only need to be epoxied back in, the left had one block come out clean and one cracked, so I will epoxy the one block and replce the other. Nose strut only needs a new shaft which I have since I ordered an extra strut anyway. I'll be back up in the air tomorrow, maybe even this afternoon. I don't think the mains broke or came loose do to the hard landing, I believe it was due to the cheap hot glue giving way and cheap wood. I will put epoxy over everything I can see.
Thanks for reading this lengthy post. I will post a shorter second flight report, if nothing goes wrong.
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Raptor v2 OS 37/Bobcat Jet OS .55 AX
Extra 330L 25% SV26cc/SIG Kougar OS .46 AX
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RE: Nitro models pusher Bobcat? - 
