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| MODEL||H.P.31 Mark I|
| ENGINE||1 x 470hp Napier Lion V 12-cylinder water-cooled in-line engine|
| Take-off weight||3242 kg||7147 lb|
| Empty weight||1998 kg||4405 lb|
| Wingspan||13.41 m||44 ft 0 in|
| Length||10.29 m||34 ft 9 in|
| Wing area||52.30 m2||562.95 sq ft|
| Max. speed||171 km/h||106 mph|
| Ceiling||2652 m||8700 ft|
| Range||708 km||440 miles|
| ARMAMENT||1 x Lewis gun, 1 torpedo or 3 x 235kg bombs|
|Alan Dugdale, e-mail, 21.12.2008 20:26|
"Contender for a 1926 Royal Naval deck-landing practice and seaplane conversion trainer was the Handley Page Harrow Mk.I, N205. Flown on trials at RAF Martlesham Heath, this two-seat re-design of the Hendon / Hanley slotted-wing torpedo-carriers was the first aircraft to have automatic slots, but lost out to the Blackburn Ripon."
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