Aerodynamics Matter !!
Hello All. First post here... wanted to share some data on aerodynamics. I am designing an ultralight (under 100 lbs/ft) small travel trailer and wanted to find out the effect of shape on aerodyna...
Forum Discussion
Ron-C,
What results in your trailer nose model example is disrupting the suction cone created by the flat rear wall of the trailer. Nose up compacts the air under the trailer as the air goes from front to back which then releases it's compression upward directly behind the trailer's rear wall and greatly reduces and disrupts the true suction form cone. Aerodynamic entry going into the wind is only half the drag force created. The suction created by the end of an object going thru the wind is nearly as strong of a drag force. Look at your example model and you can easily see the rear suction differences.
Parting the air with an adequate configured Vee shape entry reduces the parted air created vortices (spinning tornados of air) along the sides of the object and smoothens the return at the rear which also reduces rear suction. Airliners create very strong "wing tip vortices" when taking off down the runway and why there's a few minute delay between large plane takeoffs. Enough time for the vortices to lose enough effective force. Been many plane crashes over the years occur with small planes taking off right behind large planes before this powerful force was recognized and dealt with.
What results in your trailer nose model example is disrupting the suction cone created by the flat rear wall of the trailer. Nose up compacts the air under the trailer as the air goes from front to back which then releases it's compression upward directly behind the trailer's rear wall and greatly reduces and disrupts the true suction form cone. Aerodynamic entry going into the wind is only half the drag force created. The suction created by the end of an object going thru the wind is nearly as strong of a drag force. Look at your example model and you can easily see the rear suction differences.
Parting the air with an adequate configured Vee shape entry reduces the parted air created vortices (spinning tornados of air) along the sides of the object and smoothens the return at the rear which also reduces rear suction. Airliners create very strong "wing tip vortices" when taking off down the runway and why there's a few minute delay between large plane takeoffs. Enough time for the vortices to lose enough effective force. Been many plane crashes over the years occur with small planes taking off right behind large planes before this powerful force was recognized and dealt with.
