Twin Tri-Pacer custom side-by-side double engined Tri-Pacer - photo

[Jon]

Twin Tri-Pacer custom side-by-side double engined Tri-Pacer. Largest image size available.

Also known as the Wagner Twin 2, Wagner Twin Tri-Pacer, and Wagner Pacer 125, this was a standard PA-22 fitted with two 125 hp Lycoming O-290-D engines mounted side-by-side. The conversion was produced in three weeks by Harold Wagner from Portland, Oregon. To clear the two overlapping propellers the left engine shaft was fitted with a 4.75 in (121 mm) extension. After 100 hours testing, the aircraft was converted back to its original configuration.

Previously:

Casting a giant propellor GIF
Propeller feathering - GIF

[IAMSatisfied]

Those props obviously have to be counter-rotating... I wonder what they used to keep them in sync. (chain, belt or direct gear drive?). It sure doesn't appear like there's much clearance between the tip of the propeller and the adjacent hub.

Edit: If I would have paid attention, I'd have noticed the pitch of the propellers were identical.

[baja]

Those props obviously have to be counter-rotating... I wonder what they used to keep them in sync. (chain, belt or direct gear drive?). It sure doesn't appear like there's much clearance between the tip of the propeller and the adjacent hub.

https://1000aircraftphotos.com/Contr...David/8788.htm

[IAMSatisfied]

https://1000aircraftphotos.com/Contr...David/8788.htm

Thank you for that... I didn't even consider the possibility of adding an extension to one prop shaft... it certainly does the job.

[volodar]

Those props obviously have to be counter-rotating... I wonder what they used to keep them in sync. (chain, belt or direct gear drive?). It sure doesn't appear like there's much clearance between the tip of the propeller and the adjacent hub.

Edit: If I would have paid attention, I'd have noticed the pitch of the propellers were identical.

I would assume the two Lycomings are identical, as are the props. Not counter rotating. No need for any mechanical synching. Spacer puts props on separate planes. RPM synch is as in any simple twin; two hand throttles and pilot´s ears to minimize beats.

[volodar]

https://1000aircraftphotos.com/Contr...David/8788.htm

We would assume the two Lycomings to be identical, same for props. So not counter rotating. And no need for any mechanical synching. Spacer puts props on separate planes. RPM sync is as in any simple twin - two hand throttles and pilot´s ears minimize any beats.

[Scotsman Hosie]

What a weird looking hack for a Tri-pacer. Surprised it had enough wing – and heavy enough airframe – to support it, let alone the increase in stall speed.

[volodar]

What a weird looking hack for a Tri-pacer. Surprised it had enough wing – and heavy enough airframe – to support it, let alone the increase in stall speed.

Good points. Not clear whether the 100h testing included flight type(s), and with what results. Several other types Here:

TwinNavion.com