looks like your onto this ' old time ' stuff .
Here they were into Big free flight things with onboard starters and an ounce of fuel , trying to get 1/2 hour flights .
Any old free flight thing , converted to rudder only r c , with a D T tailplane , if its thermalsvile out your way .
Id thought ailerons & rudder on the left thumb , for a soarer . Glider .
I got a new two channel set for $ 2 . So might be able to affoard a battery .

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All the old free flight scale , with rudder & throtle , you should be able to get back to where they left , if you cnt stand eercise .
If your after a thrill , if its windy , yr cheap & nasty pom foam & butchers paper PVA Power Scale slope , would keep you busy .
https://rcbookcase.com/categories.php?publisher_id=6oops .
the cheap foam arsey things , found free , at times .
Dont forget to put rivets in the holes , when you take the wing fences off .

Id seen this , then at North Shore R C field , which is flat and drops into a valley at the upwind end ,
A foamy lookalike did this . Stiff breeze . Howled along at 10 foot full tit , as he pulled up , the shock
at the bump / windsheer - at the runway end , and it blew apart and scattered . Just like this . Oh dear .
https://www.facebook.com/groups/PSS.Power.Scale.Soaring/https://www.pssaonline.co.uk/2005/04/15/power-scale-soaring-part-3/