Stealth Pilot wrote:

holding the aircraft low to the ground and accelerating in level
flight does two things.
it gets you to a safer climbout speed faster.
if the engine does quit you avoid the spine destroying thump into the
ground.

Stealth Pilot

Take-offs in a Dyke Delta requires the same technique. It doesn't want
to climb out solidly until it reaches 80mph. If you try to pull it out
of ground effect to early, the drag increases to the point that
acceleration stops. Pulling the gear up gives you 20mph. I'm to
understand that there have been accidents where the pilot ran out of
runway, trying to pull the craft into the sky without enough speed, or
enough power to overcome the drag.

Lift off into ground effect at 60, and hold level as the gear comes up.
Accelerate to 100 to get solid control authority, then head for the
heavens.