Drakeshoot Posted September 20, 2021 Posted September 20, 2021 Hi All, I’m having a lovely time with the Mossie (insert Lord Flasheart reference about machinegunning my number into her bedroom wall here) but am wondering how best to squeeze performance out of the bird in at her preferred altitude (1-30ft…). I’ve been running around at 2950rpm with +9lb boost and she tends to sit around the 270-280MPH mark which is fine but I’ve just seen a video of a guy screaming along at a lower RPM, 2700ish but at higher boost, 16-18lb and he had a solid 300-320 out of her. Is this sustainable? What settings are you guys using for the various phases of a strike? Also, cowl flaps, do they make a huge difference in speed and temp? Edumacate me!
grafspee Posted September 21, 2021 Posted September 21, 2021 (edited) 16-18lbs is definitely a bit too much for 2700rpm. I would go with 12lbs and 2850 rpm for longer use and 14-16 for short burst at 2850rpm. Edited September 21, 2021 by grafspee System specs: I7 14700KF, Gigabyte Z790 Aorus Elite, 64GB DDR4 3600MHz, Gigabyte RTX 4090,Win 11, 48" OLED LG TV + 42" LG LED monitor
DD_Fenrir Posted September 21, 2021 Posted September 21, 2021 From the Pilot's Notes: Quote PART III LIMITATIONS 51. Engine data Merlin 23 and 25 The principal engine limitations are as follows :- Merlin 25 Supercharger gear R.P.M Boost lb./sq. in. Temp °C Coolant Temp °C Oil MAX. TAKE-OFF Low 3,000 +18* INTERMEDIATE 1 HR. LIMIT Low / High 2,850 +9 125 90 MAXIMUM CONTINUOUS Low / High 2,650 +7 105 (115)t 90 OPERATIONAL NECESSITY 5 MINS. LIMIT Low / High 3,000 +18* 135 105 *May not be used at r.p.m. below 2,850. t The temperature shown in brackets may be used if necessary for short periods only.
Nealius Posted September 21, 2021 Posted September 21, 2021 I've been using +12/3000 and barely getting 270 myself.
Nealius Posted September 21, 2021 Posted September 21, 2021 12 minutes ago, DD_Fenrir said: Radiators closed or open? Open. One of my engines (usually starboard) smokes if I close the rad flaps.
DD_Fenrir Posted September 21, 2021 Posted September 21, 2021 Getting the smoke myself if I don't get to the runway promptly enough but it doesn't seem to correlate well with maximum allowed coolant temps so it may be a bug....
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