Electric Motors, Engines & Accessories > Engines Glow Fuel > Engines R/C Glow Fuel Helicopter 2-Stroke - .52 & Up Bookmark this Page

O.S. - OSMG1982 OSM18645 18645 531028021419 4531028021419
Manufacturer Stock#
18645
A Closer Look at This Product
  Tech Notes

Accessories Needed

Replacement & Optional Parts

Easy RC: Engines

Browse O.S.

Product Feature Page


O.S. 91HZ-R 3D Speed Black w/Powerboost Pipe
 
Click for parts for this item
O.S. 91HZ-R 3D Speed Black w/Powerboost Pipe
View Larger Picture


Stock Number
LXAZRV
Retail Price
1099.99
Tower's Low Price
$699.99
FREE shipping when ordering this item on our web site... click for more information
Stock Status
In Stock
Limited Quantities

Buy Now
Add to wish list
—— Share ——
 

Tech Notes
 
NOTES FROM OUR TECH DEPARTMENT
This is the O.S. Engines 91 HZ-R 3D Speed Helicopter Engine in Black
with the 91 PowerBoost Tuned Pipe.

****** Because of the competition nature of this engine,******
******it is NOT covered by the O.S. 2 Year Warranty.******

FEATURES

Designed for all-out 3D competition
DRS (Demand Regulator System) ensures a steady fuel supply for 3D
flights
165 exhaust timing for optimal horsepower and stable hovering
Newly designed combustion chamber shaped to match the big bore
carburetor and advanced exhaust cylinder timing
61G Big Bore twin needle carburetor is designed to develope stable
horsepower at 70-80% throttle which is widely used in 3D flight
PowerBoost pipe is constructed of polished natural finish aluminum
and was developed exclusively for flights with 90 size helicopters

INCLUDES

91 HZ-R 3D Speed Helicopter Engine, with PowerBoost Pipe, Exhaust
Tube and Mounting Hardware, #8 Glowplug, Check Valve, 0.2mm Head
Gasket and Instruction Manual

REQUIREMENTS

Fuel: 10%-30% nitromethane with at least 18% lubricant. Lubricants
may be either castor or synthetic oil or castor/synthetic blend.
Field Equipment: glow starter, fuel bulb, fuel can filter, fuel pump
hexagonal starting shaft (depending on brand of helicopter)
electric starter, battery and fuel tubing

SPECIFICATIONS

Engine-
Displacement: 0.91cu in (14.9cc)
Bore: 1.091" (27.7mm)
Stroke: 0.976" (24.8mm)
Power Output: 3.6hp / 15,500 RPM
Practical RPM Range: 2,000 - 16,000
Weight (w/o Muffler): 21.27oz (603g)
Crankshaft Size: 5/16-24

Carburetor Adjustments-
High Speed Needle Valve: Turn approximately 30 (3-4 clicks) during
initial adjustments, then approximately 15 (1-2 clicks) when
making final adjustments
Medium Speed Needle Valve: Turn approximately 30 (3-4 clicks) at a
time
Idle Mixture Control Screw: Turn approximately 5 at a time, turn
left to enrich idle mixture and right to lean mixture
Height from crankcase bottom to top of cylinder head: 3.9" (100mm)
Height/bottom of mounting tab to top of cylinder head: 3.1" (79mm)
Distance between mounting holes same side: 0.98" (25mm)
Distance between mounting holes opposite side: 2" (52mm)
Distance between muffler screw holes: 1.6" (42mm)
Distance/bottom of mounting tab to muffler screw holes: 1.8" (42.8mm)
Distance throttle lever to center of engine: 1.6" (42mm)
Length from front bearing to center of engine: 2.2" (56.4mm)
Length from front bearing to backplate: 3.3" (83.8mm)
Length from backplate to end of crankshaft: 4.6" (118mm)
Length from backplate to center of engine: 1.1" (27.4mm)
Width of crankcase below mounting tabs: 1.7" (43mm)
Width between mounting tabs: 2.4" (61mm)

Pipe-
Length: 12.3" (313mm)
Diameter: 2.0" (50mm) at engine attachment point
Exhaust Outlet Diameter: 0.20" (5mm)
Weight: 7.9oz (225g)

jxs 04/08/11
ir/jxs

– If you need more information, use these O.S. resources –
Email: enginesupport@hobbico.com
Web Site: http://www.osengines.com/
Phone: 217-398-8970
  Postal Address:
O.S.
3002 N. APOLLO DRIVE, SUITE #1
CHAMPAIGN, IL 61822

Click here for Units of Measure Conversion Calculators

Accessories Needed
 
COMPLETION NOTES FROM THE TECH DEPARTMENT
This is the O.S.Speed .91HZ-R 3D Competition Heli Engine w/PowerBoost Pipe. FEATURES: REQUIRES: 10%-30% nitro fuel w/at least 18% lubricant content, glow starter & field equipment

Accessories for the O.S. 91HZ-R 3D Speed Black w/Powerboost Pipe

Primary Accessories   Building & Field Equipment Optional Accessories
 
  Special Stock Number Product Description Parts Saver Eligible Tower's
Low Price
Click to Order Quantity Needed In Cart? Stock
Status
 LXK129 Great Planes Silicone Fuel Tubing Standard 3'
Qty Discount Available
2.99   In Stock
 LXK134 Great Planes Ultra Precision Fuel Filter
Qty Discount Available
3.79   In Stock
 LXL387 Hobbico 4-Way Wrench w/Plug Storage
Qty Discount Available
4.99   In Stock
Subtotal for this Group of Accessories: 11.77  
Click to Order all items listed in this Group of Accessories    Buy This group of Accessories

Primary Accessories   Building & Field Equipment Optional Accessories

 
Tower Hobbies Has Been Serving Hobbyists Since 1971 • Call 800-637-6050 or 217-398-3636
See Tower Hobbies Reviews at Bizrate.com
Hobbico, Hobby & Model Construction Supplies - Retail, Champaign, IL
We accept the following: We accept the following payment methods: Discover, MasterCard, Visa, American Express, Diners Club International, JCB, China UnionPay, PayPal, and BillMeLater.
Unauthorized use of any materials presented here is prohibited. Copying or reproducing any elements from this page is not permitted. All prices, descriptions and availability subject to change. Displayed within some areas of our web site, the Retail Price is suggested by the manufacturer or supplier, or estimated in keeping with standard industry practice. It may not represent the prevailing price in your area or a price that Tower Hobbies has ever offered for the item.
Copyright © Tower Hobbies All rights reserved. Do not duplicate or redistribute in any form.