[SteveM]

I picked up this large gas motor yesterday and I believe it is a Quadra, perhaps a 35 or a 42. I am not familiar with these so if you recognize the motor please let me know. Says Made in Canada on the lower casting.

[Michael Irwin]

It’s certainly a Quadra. My understanding is that there’s no reliable way of determining a 35-42 without measuring the bore of the cylinder. Iirc it’s around 40mm is a 41-42cc, and less for a 35 (35ish mm). You can take the muffler off and stick in a bit of wood to get the diameter. If you use a popsicle stick you can stick it in and then use the piston to make a mark for measuring. My experience is that style of muffler is more common to find on a 35 than a larger one.

[SteveM]

Originally Posted by Michael Irwin

It’s certainly a Quadra. My understanding is that there’s no reliable way of determining a 35-42 without measuring the bore of the cylinder. Iirc it’s around 40mm is a 41-42cc, and less for a 35 (35ish mm). You can take the muffler off and stick in a bit of wood to get the diameter. If you use a popsicle stick you can stick it in and then use the piston to make a mark for measuring. My experience is that style of muffler is more common to find on a 35 than a larger one.

Thanks. That muffler also seems to have been thinned and brazed back together so as to make it fit the firewall when the motor is bolted directly to the firewall.

[lbjerome]

It,s a Quadra for sure, and My guess is its an older 35 cc,They where manufactured in Centralia Ont. by trail Manufacturing--- They have been out of production for sometime now----maybe around 30 yrs now my guess??? great little mtrs and dependable -> have about five 35s and 42s and about 4 or 5 ---50cc including a 50cc that has never been flown that I know of. I would like to get rid of some of them--- Lyn J

[stegl]

Actually the first Quadra 35’s were manufactured at Trail,BC. Here is a link with some details 5at may help on the “Quadra “ line of motors. The prop adapter appears to be an aftermarket one as Zi have never seen one quite like it.
https://www.rcgroups.com/forums/show...7&d=1317160388