These questions and answers are presented here to assist owner/pilots and the information from this survey may be included in the POH for the Yak-50. To be included in this survey, please reply to: yakpilot@earthlink.net You must be a Yak-50 pilot to be included in the survey. We want actual experience.
#1 When going cross-country at a relaxed pace, just enjoying your airplane, what power settings do you use, and what speed do you attain (Vrp)?
Replies: (MJ & BH) 60%/600mm/230 kph about 35-40 ltr./hr. -- (LB) 65%/ 700mm/240km/h about 50 ltr./hr.-- (RL) 59%/580mm/230 kph about 40-45 Ltr/hr. -- (SS) 65%/650mm 120 Kts/rh.
#2 When you really have to get there in a hurry, what power settings do you use, and what speed do you attain (Vr)?
Replies: (MJ)
70%/750mm/260
kph about 60 ltr./hr
#3 What settings do you find best for cross-country, what power settings do you use, and what speed do you attain (Vxc)?
Replies: MJ: 60%/600mm LB: 65%/700mm. -- RL: 64%/640mm/ 250kph 50 ltr/hr. -- FB: Recently installed a Hoffman 3 bladed prop. Outside temp 20 F. 70% RPM, 70mm Manifold Pressure, indicated 160 Knots.
#4 Have you found any bad habits from flying the Yak-50? Give us your "war stories."
MJ: Negative
flick (snap roll) on down 45 will grab the controls and go very flat.
"Basically
it will go very flat and the control inputs will be very heavy to recover from.
Gyroscopes also hinder the recover as I recall. I do not do this now. I had a
friend loose 3,000 ft when the a/c buried itself. He was at 10,000 just finding
out what the a/c will do luckily. You will need to cut the throttle then get
your second hand
on the stick, not easy with minus 3 or 4 going on!!!
RL: Does not hammerhead cleanly with forward c.g.
#5 What are the thread sizes and torque requirements for the MP-14P engine on my -50?
MJ:
Nomenclature, Thread size, Torque: Kgfm, In. Lbs.
> Propeller governor hold nuts: M8
> 1.3-1.7, 113-147
> Drain tank hold nuts and bolts: M7
> .95-1.2, 82-104
> Chip Detector hold down nuts: M5
> .45-.6, 39-52
> Cylinder base nuts: M10
> 3.5-3.8, 304-330
> Magnetos hold down nuts: M8
> 1.3-1.7, 113-147
> Generator adapter hold down nuts: M10
> 2-2.5, 174-217
> Air compressor hold down nuts: M6
> .7-.9, 61-78
> Oil pump hold down nuts: M7
> .95-1.2, 82-104
> Fuel pump hold down nuts: M7
> .95-1.2, 82-104
> Vacuum pump drive hold nuts: M8
> 1.3-1.7, 113-147
> Air distributor hold down nuts: M5
> .45-.6, 39-52
> Air start valves in cylinder: M14
> 2.5-3, 217-260
> Carburetor hold down nuts: M8
> 1.3-1.7, 113-147
> Spark plugs: M14
> 2.5-3. 217-260
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