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MC-72 / RO-Jett.76

MC-72 / Ro-Jett.76

Setup, as per July 2007

1’853 Grams / 65 oz

C.G.

23% MAC

Lines/length

0.45 mm (0.018 in) x 20.3 m (66 ft) eyelet-eyelet

Rake, as per LINE III

21 mm behind C.G. with fuel

 

 

Power Train

 

Motor

RO-Jett .76 RE

Compression

+ 0.17 mm ( +7 thou) shim. 68 PSI

Venturi

5.7 mm / .224 in.

Glowplug

Merlin No. 2003 (hot)

Air Filter

Bru-Line coarse (black) mesh

Pipe Brian Eather 3-chamber , carbon, 12 mm deflector

Dia.: 44 mm / 1.73 in. Outlet 12 mm (1/2 in.) Length to first baffle: 465 mm / 18.3 in

Take-off run noise at 3 m. / 9.8 ft

91 dBA

Tank (std. uniflow metal type, home made)

200 ccm / 7 oz 32 x 50 x 155 mm. Not pressurized.

Fuel

10% Nitro + 20% Aerosave synth. oil

 

 

Setup

23 C, 450 m (1470 ft msl)., calm

Propeller

2-blade Brian Eather, flat, 15 x 4 (at No. 10 Station of the Prather pitch gauge), square tip

T/O RPM

8’500

Run

4-2-4

Lap time

5,3 sec

Consumption for 6:20

175 ccm (6 oz)

 

 

03.07.2007 Peter Germann

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