Bravo Cruise Performance

[Jsavage3]

From the POH performance section, can you share what Mooney says the Bravo will do in cruise at 11k/12k for both ROP and LOP?  Both KTAS and FF please?  

[Fritz1]

The POH only gives cruise figures for peak TIT power settings which produce excessive CHT and TIT, I typically cruise at 30" 2300, about 78% power, 18.5 gph, 100 dF rich on 1st cylinder to peak which produces about 176 KT TAS at 12,000 ft, my aircraft has TKS, others may be 3-5 KT faster, going max cruise power 34" 2400, about 90% power typically increases cruise by 11-12 KT, flow goes to about 21.5 gph to keep TIT below 1580 dF, In a nutshell, the POH performance figures not realistic, engine durability requires higher fuel flows, to keep CHT below 480 and TIT below 1580, the sweet spot of the Bravo is around it's critical altitude of around 21000 ft, 188 KT TAS, 18.5-19 gph 78% power, she will reach 200 KT when pushed to max cruise power, about 22 gph, think when pushed to the limit at 25,000 ft the Bravo will reach 215 KT

[slowflyin]

I run similar power settings to @fritz1 and see similar results.  My commute has shortened so I don't fly as high as often with typical altitudes of 9-10K.   Most days at 75% I see 174-176 TAS.   Last time I took a longer trip it was summer time with 196 TAS at 75% at 18K.   I also have TKS.  I've been told TKS cost 10 kts.   I'd argue that only holds true if your not in ice.      I see an increase of about 2 kts per thousand feet over 8K.   I've also been told to expect 200 @ 18K  @ 75% in a non-tks Bravo.  

[Rick Junkin]

On the LOP side at 11-12,000’ I see 165-170KTAS at 13.2gph (70%) and 30”/2200RPM. I also have TKS.

For reference, here’s a screen shot of my G3X at 6,000’. Adding 2 KTAS per thousand feet up to 12,000’ the math shows 170KTAS, which of course will vary with OAT/ISA offset.

[PilotX]

Here is what I see, if I recall these were about 12500'

ROP

22/28” 16.6gph (137KIAS)

LOP

22/28” 11.5 (110)

22/30” 12.5 (125)

22/32” 13.5 (132)

22/34” 14.5 (137) ~ 170 True.

Edited 12 hours ago by PilotX
Added altitude.