Actually, I suspect not, Mark.
Ours have been used to support very large model aircraft, up to 1/48th scale, as well as die-cast metal minis (Titanium Star Wars and Battle Star Galactica fighters).
The trick is in selecting the appropriate size of bases to use. I normally recommend our 4" base. They telescope from 7" – 22" in height.
Of course, I have no idea how big your 1/300th scale Aeronefs are, so……
See below, the Topgun Dogfight Flight Stands, with 4" bases (we sell a 5" base too, for even more stability) and 1/144th scale aircraft. The B-17 has about a 9" wingspan.
[URL=http://media.photobucket.com/user/Top_Gun_Ace/media/Topgun%20Marketing%20Flight%20Stands/B-17SmokingFWsCopy.jpg.html]
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Range of motion study with 1/144th scale Spitfires performing a "time lapse" photo barrel roll maneuver.
[URL=http://media.photobucket.com/user/Top_Gun_Ace/media/Topgun%20Marketing%20Flight%20Stands/BarrelRollingSpitsCopy.jpg.html]
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E-mail me at:
topgungrav AT yahoo Dot com
I can ship you one, if you want to test it out, to see if it meets your needs, and are willing to pay for the shipping charges. Obviously, if you don't want it, I'd ask for you to pay for return shipping as well, but they're pretty lightweight, so shipping shouldn't run too much.
Let me know if you are interested.
Regards,
Rob