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T-BIRD I with some Single Engines to make Part 103!

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Armilite

Well-Known Member
Joined
Sep 5, 2011
Messages
3,738
Location
AMES, IA USA
So I did some Number Crunching based on Indys Numbers, T-Bird Manufacture. There is a 3 lb difference in the 447 vs 503, and a 10.8 lb difference between the 582 and 503. Which by using maybe just a Lithium 2.5 lb Battery all (3) Engines should maybe Work. I do find it odd the Airframe with the 503UL was 3 lbs lighter than the 447UL version. They don't Specify if this is a Tri-Gear or Tail Dragger! That Hirth F-33 (76mmx 69mm) 313.1cc is 28hp@6500rpm with a Muffler and use's a 9.5cr, so there is room for Upgrades! Going from 9.5cr to 11.5cr = 32hp if you use the Rule +1.0cr = 2hp.

28hp +20% Tuned Pipe = 33.6hp
28hp +25% Tuned Pipe = 35.0hp
28hp +30% Tuned Pipe = 36.4hp
----------------------------------------------------
32hp +20% Tuned Pipe +CR Bump = 38.4hp
32hp +25% Tuned Pipe +CR Bump = 40.0hp
32hp +30% Tuned Pipe +CR Bump = 41.6hp

T-Bird I with a 447UL 280 lbs - 93.2 lbs = 186.8 lbs for Airframe.
447UL - B gearbox, Electric Starter - 93.2 lbs / 42.3 Kg


Rotax 277UL(26hp)
186.8 lbs + 65 lbs = 251.8 lbs.
Dry weight: 29.5 kg (65 lb) (complete including Reduction Drive and Exhaust System)


Hirth F-33(28hp)
186.8 lbs + 45 lbs = 231.8 lbs.
Weight: 35 lbs including exhaust sys. - 40 lbs W/re-drive - 45 lbs W/elec. start.


Simonini Victor I(44hp), Victor I Plus(48hp), Victor I Super(54hp) 70 Lbs / 32 Kg.
186.8 lbs + 70 lbs = 256.8 lbs


===========================================================
T-Bird I with a 503UL 290 lbs - 106.2 lbs = 183.8 lbs for Airframe.
503UL - B gearbox, electric starter - 106.2 lbs / 48.2 Kg


Rotax 277UL(26hp)
183.8 lbs + 65 lbs = 248.8 lbs
Dry weight: 29.5 kg (65 lb) (complete including Reduction Drive and Exhaust System)


Hirth F-33(28hp)
183.8 lbs + 45 lbs = 228.8 lbs.
Weight: 35 lbs including exhaust sys. - 40 lbs W/re-drive - 45 lbs W/elec. start.


Simonini Victor I (44hp), Victor I Plus (48hp), Victor I Super (54hp) 70 Lbs / 32 Kg.
183.8 lbs + 70 lbs = 253.8 lbs


==========================================================


T-Bird I with a 582UL 310lbs - 115.4lbs = 194.6lbs for Airframe.
582UL - B Gear Box, Electric Start, Cooling, Exhaust 115.4 lbs.


Rotax 277UL(26hp)
194.6 lbs + 65 lbs = 259.6 lbs.
Dry weight: 29.5 kg (65 lb) (complete including Reduction Drive and Exhaust System)


Hirth 28hp
194.6 lbs + 45 lbs = 239.6 lbs.


Simonini Victor I(44hp), Victor I Plus(48hp), Victor I Super(54hp) 70 Lbs / 32 Kg.
194.6 lbs + 70 lbs = 264.6 lbs.


=================================================
582UL Engine with carburetors w/ clamps, fuel pump, exhaust system.
WEIGHT: Engine: wo/ exhaust, carb, fuel pump, radiator. 64 lbs......( 29.1 kg.)
2 Carburetors with flanges.............................4.0 lbs.......( 1.8 kg.)
Exhaust system........................................11.2 lbs.......( 5.1 kg.)
OPTIONAL EQUIPMENT: 2 air filters..................0.6 lbs.......( 0.3 kg.)
Double air filter.....................................1.1 lbs........( 0.5 kg.)
Intake Silencer with filter...........................2.4 lbs........( 1.1 kg.)
Integrated Radiator System (#881-432) ................4.6 lbs........( 2.1 kg.)
Electric Start kit, MAG side ........................9.9 lbs.........( 4.5 kg.)
Reduction box "B" (dry)...............................17.6 lbs........(8.0 kg.)
------------------------------------------------------------------------------------
115.4 lbs 52.5 kg




Reduction box "C" (dry) ..................... 8.0 lbs.......(17.6 kg.)
-----------------------------------------------------------------------------------
277UL
Specifications:
General characteristics
Type: two-stroke air-cooled aeroengine
Bore: 72 mm (2.83 in)
Stroke: 66 mm (2.60 in)
Displacement: 268.7 cc (16.40 cu in)
Dry weight: 29.5kg (65lb) (complete including Reduction Drive and Exhaust System)
Components:
Valvetrain: piston ports
Fuel system: pneumatic pump pressurized
Fuel type: premium unleaded autofuel
Oil system: premixed in the fuel at 50:1
Cooling system: fan or free air
Performance
Power output: 19 kW (26 hp) at 6250 rpm
Compression ratio: Theoretical 11.8, effective 6.7
Power-to-weight ratio: 0.64 kW/kg (0.40 hp/lb)
 
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