How Fast Can She Go?

[nullack]

Gday fellas

Im getting a kick out of trying to beat my personal best straight and level sustained speed

This involves real time weather via ASN, but no cheating, Im always at the same airports for takeoff and landing with real time weather

So far my best blend of the luck of the weather, and altitude, and speed is:

GPS ground speed of 365 knots which is 420 MPH @ 67.7" of manifold pressure doing 3000 turns per minute, thats high blower at 22000 feet AGL

Any tips on more speed?

[robert41]

Take her up a bit higher. Near 30000ft. Find a good tail wind.
Wait for next winter, get up into the jet stream in the north. I have found 100+ knot winds giving me those speeds (400+) at a cruise power setting, having drop tanks installed.

[nullack]

Hmm Robert Im not really doing much better at FL300

The problem is the manifold pressure from high blower suffers as you go from say FL200 to FL300

I realise the drag is less, but I dont see tangible gains

I appreciate that your theory may involve having tail winds in the jet stream, but thats the luck of the weather and I run real time ASN HIFI weather

Hmm, its fun to ponder this and experiment

[robert41]

Having a good tail wind is the key.

[n421nj]

How heavy are you? Try less weight