It is a Sea Hornet that I have scaled up from an original Aero-Kits plan. The original was for a 25″ model but I have scaled it up by 1.56 to give a length of 1 metre. Obviously all scratch built with everything cut by hand. The model will have twin motors and I’m hoping to have it ready for when we are next allowed to sail.
There are enumerable photos, kits and other information about model Sea Hornets, but despite trawling the internet for several hours, I have only been able to find one reference to a full size Hornet. This is of a boat built in 1932 (see attached screenshot) with a length of 28ft and this is in Michigan. The shape of the transom is very similar to the model (but there are other boats with a similar shape) as are the two windscreens. As there is only the one view it’s hard to say if there are other similarities.
During my searches I have seen Keil Kraft model kits dated for 1952 but whether they were modelled on this Hornet, I can not say. So if any Member knows anything more about a full size Sea Hornet, I would be interested to hear.
The boat is constructed mainly of plywood and oneche but there will be a number of 3D printed items as well. I up-sized the plywood by one thickness from the original plan to correspond to the upscaling, but in hindsight, I could have stayed with the original thickness for skins and decks. Plywood for the bulkheads and keel (5mm exterior grade) came from Wickes whilst the skins and obeche came from Slec. Twin 250 watt, 1000Kv motors supplied with power from separate batteries and ESC’s, will provide the driving power.
I’m nearing the end of the Sea Hornet build and into the finishing stages, paint and varnish, so here are one or two photos before final completion
My Sea Hornet was constructed from an original Aerokits plan of unknown date, that was enlarged from 25” length to 39” (almost 1 metre). As a consequence it was totally scratch built with all bulkheads and skins being scaled up from the originals. Plywood was used for the entire construction apart from some balsa at the bow and obeche rubbing strakes. The deck was veneered with strips cut from sapele sheet (mahogany substitute) with balsa strips in between each strip to create the lines.
The hull was spray painted and the deck brushed with two coats of yacht varnish.
All deck fittings and the seats were 3D printed from my own designs as were all the components for the jet propulsion units. The latter were the result of internet searches for information and a development programme to ascertain impeller size, thrust and power required.
Each propulsion unit has an eight bladed impeller mounted on a 4mm diameter stainless steel shaft and is driven by a 250 watt brushless out runner motor. A 40A ESC drives each motor from a pair of 3S 5800mAh lipo batteries. (I am currently looking to change the batteries to 4S as I feel that the boat is a little under powered.) Reverse is accomplished by lowering a bucket.