I can't see what the power for this model is on the face-card.
I'm assuming it would have to be at least 24mm with a D12 for a model this large (2.6") if not an E12 as the altitude listed is 500'.
I know the 1284 Space Shuttle was only ST-20 based and got nowhere near that high on a C5-3.
That orbiter appears large enough to house micro 3-channel radio gear.

__________________
When in doubt, WHACK the GAS and DITCH the brake !!!

Yes, there is such a thing as NORMAL, if you have to ask what is "NORMAL" , you probably aren't !
Failure may not be an OPTION, but it is ALWAYS a POSSIBILITY.
ALL systems are GO for MAYHEM, CHAOS, and HAVOC !