Hi Stefan
It was a British pilot called Richard Meredith-Hardy who flew a trike solo, but towing an Italian hang glider Pilot over Mt Everest using a 914 engine. I then used the same trike, but with a different wing on it and flew from Moshi over Mt Kilimanjaro with a British Woman microlight pilot who lives in Tanzania. We managed 24,262ft which was, at the time a new official World Record. This has since been beaten, and the new record is just short of 27,00ft flown dual. Quite impressive.
Mark
PS Did the resistors ever turn up?