When beekeeping in Queensland there was a recurring theme of older beekeepers recommending nine frames in 10 frame Langstroth honey supers. This isn’t something I have seen in Canberra, but when creating 37mm wide frames for the eight frame Langstroth discussion (Improving eight frame Langstroth spacing with wider end bars), I thought it would be a worthwhile exercise to make ‘extra wide’ end bars at the same time to investigate spacing nine frames in a 10 frame hive for those that use this method.
One of the reasons given for this alternate spacing is to make uncapping easier with an uncapping knife. Unfortunately, widening the frame end bar doesn’t accommodate this requirement as the comb won’t protrude past the width of the end bar, but it does provide consistent spacing between the frames removing the need to manually space them. The original Hoffman frame design is for evenly spacing frames pressed firmly together. This end bar design keeps this design principle but makes the frame slightly wider.
To achieve close to 350mm total frame width (10 x 35mm), the frame end bar shoulder width was increased to 39mm to produce a total frame width of 351mm (9 x 39mm). This creates a wider frame that also increases spacing between top and bottom bars. The gallery width between frames is maintained using the same dimension as the 35mm end bars.
10 x 35mm Hoffman frames in 370mm width plastic Langstroth super
Remaning space in super shows just over 19mm (35mm end bar has some minor variance and are slightly larger than 35mm)
Laser cut 39mm end bar
Spacing in 10 frame hive using 9 frames with 39mm end bars
Showing almost identical spacing to 10 x 35mm end bars. Due to minor sizing discrepancies in 35mm frame end width, result is slightly larger remaining space for 39mm end bars, not less