Ord-Hume O-H 7 (oz3888)

About this Plan

Ord-Hume OH7. Peanut scale model British homebuilt single-seat ultralight monoplane.

Update 15/9/2022: Added article, thanks to RFJ.

Quote: "This little peanut is a natural flier on CO2 or rubber. A little small for a dethermalizer, so have your track shoes handy just in case! Ord-Hume OH7, by Walt Mooney.

Our man of unlimited sources found a natural for scale free flight in the little Ord-Hume 0-H 7 English homebuilt. Walt has given this peanut scale a split personality by showing how to install CO-2 or rubber power.

This little model of a small English homebuilt is an ideal configuration for a Peanut Scale. It has a high wing, with low aspect ratio and adequate dihedral. It has a tall squarish fuselage and a rela-tively large tail. The model also has a longish nose and tail. All of the above characteristics lit it well for a career as a Peanut. A three-view of the OH-7 can be found in Janes's The Worlds Aircraft for '70-71.

The model shown in the photographs was originally built as a rubber powered Peanut and after about six months of success! ul flying, indoors and out, it was converted to CO-2 power using one of Bill Brown's delightful little engines. It differs from the plans in several minor places.

First, the wing has a single spar and sheet ribs. The wing on the plans has two spars and sliced ribs which will give a lighter wing and better support for the strut attach points on the lower surface of the wings.

Second, the plans show scale dihedral. The model's dihedral was put in by eye and as luck would have it, it's a little less than scale. The plan model should turn out a little more spirally stable than the original.

Best time indoors with a 10 inch loop of 3 mm Perelli is 42 seconds. Outdoors with a loop of 4 mm it will exceed a minute easily and although thermals don't really count, it has twice flown for more than 15 minutes, which is good if you like the exercise of chasing it. After conversion to CO2 it has averaged more than a minute and a half..."

Supplementary file notes

Article.

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