Tag: Wildcat
First run of the YS .91 FZ! RAW POWER!
by greg on Dec.12, 2009, under Engines and Motors
Ok so after spending 2 hrs making my self $500 poorer due to needing a set of tires on my car, I drove down to Nexgen Hobby in Hagerstown, MD (http://nexgenhobby.com/) to get some fuel for my YS .91 FZ four stroker I put on my Extra 330s.
I picked up a gallon of Wildcat “Curtis Youngblood” 30% Nitro 23% Full Synthetic Oil for $27.00. Not a bad price for 30% fuel if you ask me.
On the way home I got to thinking that the puny aluminum 6×32 Phillips head screws I used to mount the big 4 stroker to the engine mount just wasn’t enough….so I stopped at Lowes and picked up some 10×24 “Grade 8″ Hex head screws and stainless “nylock” nuts.
Got home and went right to work replacing the mounting screws with the MUCH heftier hex heads. After finishing, I pumped about a quarter tank of the Wildcat 30% into her and got going.
I followed the directions I found online for these “fuel injected” engines. Open the throttle to full, turn the prop over 10 times, close the throttle to Idle, turn the prop over another 10 times.
I attempted to start it initially with a few flips of my (gloved) hand, but had no luck. I then proceeded to use my Hobbico electric starter and she fired right up. Initial thoughts on the engine are OMFG! I don’t have a tach, so I don’t know what kind of RPMs I was getting but spinning an APC 15×8 prop this engine can put out some SERIOUS thrust. So much that I could barely hold onto the fuse with my non-radio hand. Idle is nice and transition to full throttle is superb!
The high speed needle is sitting at 2 turns out right now until I have more time to get her dialed in just right. It was about 30 degrees out so I got very cold, very quick and finished up after about 3 mins of running.
I cant wait to get this bird out to the field and into the air!

