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Thunder Tiger - TTRG9804 TTR9804 9804 719523592690 4719523592690
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Thunder Tiger F-91S 4-Stroke w/Muffler
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Thunder Tiger F-91S 4-Stroke w/Muffler
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Instruction Manuals: Manual 1 (12.6 MB)

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Possible Substitutions

Tech Notes
This is the Thunder Tiger F-91S Four Stroke Model Airplane Engine.


CNC machined construction for precise tolerances
Front and rear ball bearing supported crankshaft with Ni plating to
reduce corrosion
Easy to adjust updraft airbleed carburetor
Black anodized aluminum muffler with pressure tap
Redline RF glow plug
Forged aluminum connecting rod with dual bushings
Lightened hypereutectic machined Al-Si ringed piston with XC2
(extreme composite coating) cylinder liner with etched criss cross
Three year limited warranty through Hobby Services beginning at date
of purchase


Thunder Tiger F-91S Four Stroke Engine with header pipe, muffler,
glow plug, valve gauge, valve adjusting wrench, 1.5mm, 2mm, 2.5mm
and 3mm hex wrenches, instruction sheet, Redline RF glowplug,
decals and box wrench with 14mm & 12mm hex sizes


Fuel: 18% lubricant and 10-15% nitro content, synthetic/castor blend
lubricant recommended
Propeller: Break-in: 11x10
Stunt/Aerobatic: 11x10, 11x11, 12x10, 12x11, 13x9
Scale: 14x7, 15x6, 16x6, 12x8 (3-blade)
Glow starter, plug wrench and field equipment


Displacement: .91 cu in (14.97cc)
Bore: 1.114" (28.3mm)
Stroke: 0.937" (23.8mm)
Practical RPM: 1,800 - 12,000
Output: 1.6 HP @ 11,000 rpm
Weight: 26.20oz (742.8g) without muffler
Crankshaft Size: 5/16-24
Height from Mounting Tab Bottom to Top of Rocker Arm: 3.77" (95.7mm)
Height from Crankcase Bottom to Top of Rocker Arm: 4.63" (117.7mm)
Width at Mounting Tabs: 2.36" (60mm)
Width of Crankcase below Mounting Tabs: 1.69" (43mm)
Center of Mounting Holes Same Side: 0.98" (25mm)
Center of Mounting Holes Opposite Side: 2.05" (52mm)
Center of Crankcase to Drive Washer: 2.62" (66.5mm)
Distance from Backplate Screw to Drive Washer: 3.64" (92.5mm)

jxs 10/20/10

– If you need more information, use these Thunder Tiger resources –
Click Here: Manufacturer's Product Web Page
Email: productsupport@hobbico.com
Web Site: http://www.ttamerica.com/
Phone: 217-398-8970
  Postal Address:
Thunder Tiger
3002 N. Apollo Drive, Suite #1
Champaign, IL 61822

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Accessories Needed
This is the Thunder Tiger F-91S Four Stroke Model Airplane Engine. FEATURES: CNC machined construction, ball bearing supported crankshaft, ringed piston, forged aluminum connecting rod with dual bushings, glow plug, valve adjustment kit, header pipe & muffler REQUIRES: Fuel, propeller, glow starter and field equipment

Accessories for the Thunder Tiger F-91S 4-Stroke w/Muffler

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
 LXHY31 Top Flite 11x10 Power Point Propeller
Qty Discount Available
3.49   In Stock
Subtotal for this Group of Accessories: 3.49  

Primary Accessories   Building & Field Equipment Optional Accessories

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