Is it just me or does VNAV (737-700) produce brutal and unrealistic climb rates? For example, after completing a WOB2G departure from EGLL, I activate VNAV after the SID has been flown, and I get climb rates of up to 4000 fpm to begin with! Is such a rate of climb acceptable and normally used in real life? I also get descent rates of around 2100 fpm, is this normal?Thanks.James.

Perfectly normal, at least so far as I have been told.

As Fred already stated. Perfectly normal climb rates. To reduce climb rates if lightly loaded try to derate (TO-1/2, CLB-1/2) or use assumed temperaure thrust reduction (SEL TEMP). Apparently the latter is preffered as it's a 'soft' limitation on thrust.As I understand it the A/P in the real NG is pretty crude and not that passenger friendly. I've seen quite a few tips on ppRUNe about smoothly changing pitch attitudes with V/S and then use a more complex mode like LVL CH or VNAV once the major change has been done.Hope it helps,

There is no such thing as "normal" when it comes to VNAV. Everything is reletive to weight, power, weather and temperature and maybe a few other things. Try speeding up to your climb speed before you engage VNAV, it will transition to VNAV much more smoothly...Best Wishes,[h4]Randy J. Smith[/h4]http://www.rawbw.com/~bdoolin/shinault/southparkcartmad.gif[h3]I WANT MY 747![/h3]Caution! Not a real pilot, but do play one on TV ;-)

Thanks to all that replied. I'll try it out now.

What Randy, Fred and I mean here is that there are ball park figures we can say contains normal values. Considering the above mentioned parameters. Right Randy? ;-)Cheers,