Godfather Posted February 29, 2016 Report Posted February 29, 2016 6 hours ago, jclemens said: Everyone knows physics don't apply to aircraft..... I agree that a quantitative analysis is hard to use when making purchases for expensive hobbies/enjoyment activities. However, for takeoff performance which is what we are talking about, I would think the aircraft lbs/hp would be a good judge. For that the 150->182r (gw) would be 16 lbs/hp -> 13.5 lbs/hp and the m20s 244->310hp (@ the same 3200lbs) would be 13.1 lbs/hp -> 10.3 lbs/hp...
carusoam Posted February 29, 2016 Report Posted February 29, 2016 There has got to be a few Macs around. If you are interested in following up in that direction. TopProps have been replacing them one at a time. It may take a blade from here a hub from there.... Best regards, -a-
Flymu2 Posted February 29, 2016 Author Report Posted February 29, 2016 As far as I know only the Hartzell qualifies for 310 hp. Maybe the MT as well. I'd be happy to be disabused of that notion.
M20F Posted February 29, 2016 Report Posted February 29, 2016 1 hour ago, Flymu2 said: As far as I know only the Hartzell qualifies for 310 hp. Maybe the MT as well. I'd be happy to be disabused of that notion. No matter how you slice it though my understanding is you need a 3 blade for the STC because a 2 blade isn't going to convert 310HP to thrust.
Flymu2 Posted March 1, 2016 Author Report Posted March 1, 2016 It's not strictly the number of blades. I flew a BE18 with 450 hp engines and 2 blade props. The diameter might be too big for ground clearance. The 3 blade Hartzell is the only prop approved. The reason doesn't matter. 1
M20F Posted March 1, 2016 Report Posted March 1, 2016 10 minutes ago, Flymu2 said: It's not strictly the number of blades. I flew a BE18 with 450 hp engines and 2 blade props. The diameter might be too big for ground clearance. Correct, you aren't going to get a big enough 2 bladed prop on a Mooney so the added blade(s) becomes needed.
aviatoreb Posted March 1, 2016 Report Posted March 1, 2016 26 minutes ago, Flymu2 said: It's not strictly the number of blades. I flew a BE18 with 450 hp engines and 2 blade props. The diameter might be too big for ground clearance. For sure - it must be the diameter that would be needed and the low slung Mooney gear that make for 2 blades and 310hp to be incompatible.
Recommended Posts