LR - Attempting a ski-jump without the "bin lid" (or '57 Chevy hood, as it is known in these parts) open would be rapidly followed by a landing in the style of that great "Lockheed Martin legacy" product, the F2Y Sea Dart.
The drag factor from the bin lid may not be as scary as it looks. With the 20 megawatt garbage disposal on full blast, the airflow in that region is going anywhere but straight aft.