Shipping Estimate
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- USA
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Ships within 48 hours · Estimated delivery Jul 7 - Jul 12
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Description
O.S. Speed 91HZ-R 3D Helicopter EngineFollowing the popularity of the 91HZ R with On Demand Regulator, O. S. has now taken high performance, high speed helicopter engines to the next stage of evolution. Introducing the 91HZ R Speed Engines based on the 91HZ R, factory tuned at the O. S. Japan facilities and guaranteed to blow you away! Features: Lightweight, machined heat sink head Big bore carburettors best suited for the intended use (F3C or 3D) Best precision advanced exhaust cylinder
Following the popularity of the 91HZ-R with On-Demand Regulator, O.S. has now taken high-performance, high-speed helicopter engines to the next stage of evolution. Introducing the 91HZ-R Speed Engines - based on the 91HZ-R, factory-tuned at the O.S./Japan facilities and guaranteed to blow you away!
Features:
- Lightweight, machined heat sink head
- Big-bore carburettors best-suited for the intended use (F3C or 3D)
- Best precision advanced exhaust cylinder timing (for F3C or 3D)
- Newly designed combustion chambers, shaped to match the big bore carburettors and advanced exhaust cylinder timing
- Lightweight, forged steel crankshaft counter weight to lower vibration for higher speeds
- Improved back plate shape, to accommodate Futaba's BPS-1 RPM Sensor and increase primary pressure for greater stability
- The cover plate has a cell to accept a sensor designed to install in the cover plate from Futaba GY701 / CGY750 Governor
Technical Specifications
- Displacement: 14.95cc
- Bore: 27.7mm
- Stroke: 24.8mm
- Output: 3.6ps/15,500RPM
- Practical RPM Range: 2,000-16,500
- Weight: 603g
Package Included:
- Engine Pack O.S. Speed Tuned .91HZ-R Helicopter Engine with Pump, 61G Carb
- #8 Glow Plug
- Check Valve
- Head Gasket 0.2mm
- OS Speed Decal and English Instruction Manual
Pipe: O.S. Powerboost Pipe 105
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.3 ★★★★★
Based on 1739 reviews
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Product Reviews
★★★★★ 5
Name holds true.
Size: Large Triple
Just bought my second set of these.. first set lasted my healer almost 4 years and are still together but starting to split at the smaller seams so you can’t play as aggressive as my dog would like. We bought the second set and now she has her second wind! She loves tugging and I love knowing this toy will last a good while especially with an active dog!
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Reviewed in the United States on January 4, 2025
★★★★★ 5
My Aussie loves this bone!
This wishbone is so durable! My Australian shepherd is a big cheese and this is her go-to chew toy. It's a fave! She has spent HOURS chewing on this bone and it has held up super well. It has no smell but understand she can taste the flavor of it. I love having something she can chew on that is safe for her that she enjoys. Great value.
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Reviewed in the United States on May 10, 2026
★★★★★ 5
Durable, Great Value Dog Bone!
We’ve ordered several of these that have lasted for months, and my dogs are still working on them. Months. That alone feels like a small miracle. Normally, chews last about 10 minutes. Not this one. This thing is built like it trained for battle. It keeps them busy, satisfied, and focused on something that is actually meant to be chewed.
And the best part? It’s way more affordable in the long run. Instead of constantly buying new toys, chews, or replacing destroyed shoes, this one just keeps going. Definitely worth every penny and then some.
If you have determined chewers, this is the chew/bone you’ve been looking for.
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Reviewed in the United States on February 18, 2026
★★★★★ 5
Dog loves this
My dog absolutely loves the shape of these and will play with it for hours. The material is pretty durable too, though he is a big lab so over time chewed away the top nubs. Eventually tossed it at that point, but got great use out of it before. No bad smell and my pet really enjoys playing with it. It’s not too big either and is really easy to take with you on trips, etc. have bought multiple!
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Reviewed in the United States on April 17, 2026
★★★★★ 4
Dog liked it, chewing cat did not
My dog liked it, but I actually got it for my cat that insists on chewing on everything. However, he refused to chew on this toy. He sniffed it once and walked away. So, for dogs I guess it's a decent chewy...
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Reviewed in the United States on February 24, 2026