i believe its called atmoshperic inversion. ----- Original Message ----- From: Gordon <[EMAIL PROTECTED]> To: J.P. Morere <[EMAIL PROTECTED]> Cc: RCSE <[EMAIL PROTECTED]> Sent: Sunday, March 03, 2002 11:09 AM Subject: Re: [RCSE] River of lift.
> J.P. > What you are saying has relevance in some cases > and would manifest itself more as thermal activity. > Wave air is created by moving air having to go > over objects such as a mountain, cliff, tree line > or a large building, just like on the slope. > In this case, the air or wave can be very high in > comparison to the object creating it. > Sometimes unreasonably so. > I have had guys standing right next to me for an > hour watching me fly in the same relative place > all the time telling me that it must be a thermal, > that no wave could be that high or strong. > > The wind on the ground might only be 10-15 knots > but up at 1000-2500 ft it can be moving at far > greater speeds, and usually is. My planes always > come alive and dance around in all the lift at > that altitude, sometimes scaring the crap out of > me. No thermal I have ever been in has had the > same effect on me or my plane. > As for onshore/offshore wind.... this is true > during the day as the land heats up and rises > drawing in the cooler air from the water, but the > opposite happens at night, when the land cools > down and the water is now warmer having heated up > during the day and is now pulling the air out over > the water.(offshore). > BTW, Waves can be found at 18,000 ft. and above. > > > Gordon, Waving goodbye. > > > > > J.P. Morere wrote: > > > This may be related to the 'onshore/offshore' wind effects. The water > > is a temperature moderator, and is usually cooler than the shore. During > > the day, the sun heats the shoreline nicely, and thus warms the air > > above it, but the water temperature changes very little. This warm > > onshore air rises, and is replaced by the cooler offshore air - which is > > subsequently warmed and the cycle continues, as long as there is heat > > input like sunshine. That 10-12 knot wind you feel is only at surface > > level. The air above could be going any which way! Ever noteced that > > wherever you are around a VERY large body of water the wind usually is > > blowing onshore from over the water? > > > > Good sky; > > J.P. > > > > Stephen Syrotiak wrote: > > > >> Hi Gordon, > >> Thanks for your believable theory. I've flown my Escape right off the > >> beach in S. CT wondering all the time what the hell kept it up, at near > >> spec height. The plane was probably right over the water's edge and > >> flying like it was in wave. i.e. just hovering at windspeed. I > >> couldn't believe it was a wave at the time. Surface WS were only 10-12 > >> kt. This happened many times and I landed only because I got bored and > >> needed an aerobatic fix. > > > > > > > > > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED] > RCSE-List facilities provided by Model Airplane News. Send "subscribe" and "unsubscribe" requests to [EMAIL PROTECTED]
