A revised version of OS’s popular 91 pumped engine has just become available!

This is the O.S. .91HZ-PS 3D Helicopter Engine with Pump and 61B-PII Carburetor features a revised pump diaphram for improved fuel regulation and consistency.
FEATURES: PD-08 pump works with a matched 61B-PII carburetor and integral regulator attached to carburetor to deliver a steady fuel [...]

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VJ product is bringing out a new F3C muffler specifically designed for the OS 91HZ engine for competition  use. Currently still in the pre-production stage, the company has posted that performance of the new muffler is pleasing. It gives consistent performance and brings out the power in the upstairs(it says up in the air, which I assume stands for the [...]

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Hatori has released the new SB 20 pipe!

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As some of you may know, Align had great success bundling their popular T-rex 600 NSP package to include an Align-labeled OS50SXH hyper engine. In fact it seems that they sold so many of these packages that they ran short of the Align-branded engines and are now packaging the standard OS-branded models.
Hoping to continue that [...]

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If you thought the above title is old news of the recently released 91HZ or Align 90 size engines, then you are wrong.
If you thought OS is done with their PS (pump) system on their heli-engine…again…you are wrong.
This new variant of the 91HZ has been equipped with the O.S. PD-08 pump and regulator system. The carburetor [...]

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Its has been released to the mass market, which means you can now buy a OS 91HZ in a OS box with the OS label, instead of the Align version. 

It hit my LHS (rotor.com.sg) today and retails for around US $310.00, so I guess it will hit all good hobby shops real soon.

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