Era Model Service
High Quality Plan Sets for Radio Control Aircraft
Carl Goldberg's 1938 Comet Clipper
GEMS Clipper Mk II prototype
This is the second version of the Clipper. Both were sold as Kit T-7. The first version, which had a single dihedral joint has in later years been called the Mark 1,
and this version which has polyhedral has been called the Mark 2. As near as I can determine, the first version was sold for one year, 1937, and then the
polyhedral version replaced it in 1938. The "Mark II" has a slightly shorter cowling, side stringers on the fuselage, and a completely different spar structure in the wing.
was able to find an original Mark II kit still complete in it's
original packaging and based the plans on that kit. The
transitions go from undercambered
at the root to symmetrical at the tip. The only way to produce accurate ribs was to scan the original die cut parts as the ribs were not included on the
Comet plans. I set up the ribs with feet so the wing can be built on the plans, and drew the parts to include a transition to 1 degree of washout from
the polyhedral joint to the tip.
Plan Span 71.8 inches AR 7.59 t/c ~8.75% at root, 7.5% at dihedral break, 4.75% at tip rib
Wing Plan Area 678.6 4.713 sq feet
Horizontal Tailplane area 163.9
Min. Wt at 8 oz. 37.7 oz.
Min Wt at 10 oz. 47.1 oz.
Weight of prototype with 2200 mah battery is 40.2 ounces.
plans are detailed with building notes and show every part.
are $20 plus postage. Laser cut partial kits
are available for $75 plus postage. Strip wood and sheet balsa will need to be added. Postage is only charged
once for orders for both plans and parts in the same order.
allow me to quote the cost of postage please contact me at firstname.lastname@example.org with
your address and I will calculate the actual postage.
A detail of the plans for the Clipper
Clipper Mk II Building Photos and Notes
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