Zenoah-62 reduction drive starting
#1
Thread Starter
Zenoah-62 reduction drive starting
I recently aquired a Giant Scale Tiger Moth powered by a Zenoah G62 with reduction drive. The kit and power train came from Toni Clark. I am very familiar with large scale models and petrol engines but this is my first experience with the reduction drive. Once started it sounds awesome and flys beautifully but.......it is very hard to start. The engine starts perfectly when removed from the reduction drive unit but once it is all back together it is difficult to get a decent flick of the prop to get the engine to fire. Does anyone have any experience with this setup or a few tips on starting?
#3
I recently aquired a Giant Scale Tiger Moth powered by a Zenoah G62 with reduction drive. The kit and power train came from Toni Clark. I am very familiar with large scale models and petrol engines but this is my first experience with the reduction drive. Once started it sounds awesome and flys beautifully but.......it is very hard to start. The engine starts perfectly when removed from the reduction drive unit but once it is all back together it is difficult to get a decent flick of the prop to get the engine to fire. Does anyone have any experience with this setup or a few tips on starting?
http://www.vogelsang-aeroscale.com/sopwithpup.html
Sincerely, Richard
#4
Thread Starter
Thanks Richard. I will check with the supplier to see if they can help with a few tips. It isnt possible to fit a spring recoil starter as the lower gear pulley is attached to the back of the crank shaft and it is just too tight a fit for an electric starter to be installed. We have already changed the flywheel for a heavier version to try to get the engine to tun over with a little more momentum and it helped.Maybe an even heavier one is an option we might try?
#5
Thanks Richard. I will check with the supplier to see if they can help with a few tips. It isnt possible to fit a spring recoil starter as the lower gear pulley is attached to the back of the crank shaft and it is just too tight a fit for an electric starter to be installed. We have already changed the flywheel for a heavier version to try to get the engine to tun over with a little more momentum and it helped.Maybe an even heavier one is an option we might try?
Sincerely, Richard
#7
Join Date: Jul 2007
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I use this same set up on my 1/3 scale BUSA Fokker D VII. Full throttle full choke. Flip it until it pops, it is a very suttle pop. It's not like the engine fires like without the reduction drive, just a pop. return the throttle to idle and turn off the choke. 3 or 4 flips later the engine will fire. In terms of flipping, this set up needs a flipped aggressively, much more than a gasser without the reduction drive. Since this motor will have 2.5 compression strokes per revolution the compression stokes change. I found you can get a really good flip when the prop is at the 9 or 10 o clock position and flip down. Hope this helps.
Wild Bill
Wild Bill
Last edited by wildbills21; 08-26-2015 at 05:00 AM.
#9
I use this same set up on my 1/3 scale BUSA Fokker D VII. Full throttle full choke. Flip it until it pops, it is a very suttle pop. It's not like the engine fires like without the reduction drive, just a pop. return the throttle to idle and turn off the choke. 3 or 4 flips later the engine will fire. In terms of flipping, this set up needs a flipped aggressively, much more than a gasser without the reduction drive. Since this motor will have 2.5 compression strokes per revolution the compression stokes change. I found you can get a really good flip when the prop is at the 9 or 10 o clock position and flip down. Hope this helps.
Wild Bill
Wild Bill
Sincerely, Richard