I just want to throw this topic out into the ether for discussion, but mainly for clarification.There are some who remember the old discussion about the turn to downwind and the loss of airspeed that resulted from the increasing tailwind component. This has thuroughly been discussed and debunked. However, there are still some who think that the aircraft feels an acceleration as the groundspeed increases during the turn to down wind.Example: Assume you are flying in a 50kt direct headwind at 5,000ft with a 100kt TAS. You currently have a 50kt ground speed- we can all agree on that. Now assume you make a 180 degree turn to downwind. Your new ground speed is now 150kts (100kt TAS + 50kt wind.) The aircraft accelerated 100kts over the ground, yet the TAS remained the same throughout the turn. There are some that think that that 100kt acceleration can be felt by the pilot and the aircraft physically experiences this acceleration. Obviously we are talking apples and oranges here, as the frames of reference are mutually exclusive. Fying in IMC with no reference to the ground, doing a 360 degree turn, you would not feel yourself going faster as you turned down wind and slower as you turned upwind (we are not talking about turns around a point, in which this would absolutely be the case)The only acceleration felt in the turn to down wind (or upwind) is the acceleration inherent in the turn itself, as acceleration is defined as a change in direction and/or speed. However, the forces felt are the same in a steady wind and a no wind (shearing wind is a different subject.)Does anybody disagree with was written here?