How does One maintain "Track" during the initial phases of an Instrument Takeoff...without being able to see the surface?
What is the wind correction angle for a given crosswind take off....at say Ten Knots....varying to 70 knots IAS during the takeoff.
As mentioned...if you begin your takeoff from the end of the runway or even mid-field....how real is the risk of flying into an obstruction ala hangars, other aircraft, wind socks, etc?
FAA Airmen Information Manual (AIM) part 5-2-8 discusses Instrument Takeoffs (particularly airports).
https://www.faa.gov/air_traffic/publ.../media/AIM.pdf
Page 684 has the definition of "Maintain Runway Heading" answers part of the questions.
That means fly the magnetic heading of the runway.....(RWY 24 magnetic heading 244....fly 244 not 240) with no drift correction.
Obstacle clearance data on Approach Plates and SIDs is based upon the elevation at the departure end of the runway and assumes the aircraft is at least 35 feet AGL at that point.