Zenoah ZG62 Geardrives
The 2.5/1 gearbox ensures smooth running of the Zenoah G 62. The geared Zenoah G 62 turns our scale mahogany-birch 34x20" propeller with a speed of around 2900 rpm. Idle speed with this prop is around 800 rpm. The gearbox is very compact as the distance between engine mount and propeller is only 190 mm (7.5”), the distance between center of crankshaft to center of gearbox shaft is only 80 mm (3.15“).
Without engine the gearbox weighs only 2,160 g (4 4/5 lbs) and 4,150 g (9 1/5 lbs) with Zenoah G 62 (but without muffler). We use this gear drive in combination with the Zenoah G 62 in the Fly Baby with a wingspan of 3.8 m (149.6”) and a flying weight of 17,500 g (38 3/5 lbs).The combination provides ample power for scale-like flying and aerobatics.
In level flight the Fly Baby reaches a considerable speed and you can pull the nose up to enjoy fantastic acrobatics. As she goes down with motor cut right back, the large propeller acts like an airbrake and slows the model right down.
Due to the increased size of the propeller used you get a level of performance out of your Zenoah Z62 otherwise thought impossible, You will love the power and sound you get out of this setup. The reduction gearing uses four miniature vee belts.
These Polyflex belts are more flexible, smaller, thinner and in spite of this can transfer more power as well as requiring a lot less space.The life of these Polyflex belts is unusually long, Some customers report that their setup has been flown regularly most weekends during the summer and it was only after that summer before the belts needed replacing. We often hears from customers who have been flying for several years with the original set of belts. Because they fit four belts it is highly unlikely that the belts fail simultaneously. When a belt fails three can carry on flying without noticing anything until the next start. A pair of new belts are easy and quick to refit.The gearbox is supplied with assembly instructions. It can be installed inline or side mounted.
The side mounted gearing has the drive shaft running alongside the carburetor and is for ring cowls, such as our Sopwith Pup and horizontally opposed twins. The inline version has the drive shaft over the crankcase, this is for models such as the Fly Baby. We stock replacement v-belt sets.
The standard version suits most installs, such as a Fly Baby, Tiger Moth, Stampe etc
The extended version suits installs such as a Fokker DVII where the cowl “kicks in” and the Albatros is the longest.
Distance Backplate to Prophub:
Standard: 7.5", 19cm
Extended: 8.9", 22.5cm
Albatross: 9.8", 25cm
The heavily modified extra long version, which has not only a reinforced shaft design but features a brand new geometry, suits installs such as the Albatros where the cowl is long and tapers, hence we call it the Albatros Style drive.