During 1928 Timm designed the Collegiate series of parasol-winged two-seat light aircraft fitted with fixed tailwheel undercarriage.

[1] During their operational lives, several of the six Collegiates were fitted with replacement powerplants, giving rise to new designation numbers.

[1] The aircraft served with private pilot owners both pre and post World War II.

In 1930, the first Collegiate M-150 NC279V City of Los Angeles set an endurance record of 378 hours in flying the equivalent of 27,677 miles over Rosamond Dry Lake, California.

The other NC337 was owned by Albert I. Stix and is on public display in the Historic Aircraft Restoration Museum (HARM) at Dauster Field, Creve Coeur, near St Louis Missouri.