Holverson Designs - Silver Hawk

Contributed by John Hogan

Construction Rating: starstarstarstarstar_border
Flight Rating: starstarstarstarstar
Overall Rating: starstarstarstarstar
Manufacturer: Holverson Designs

Glider PicBrief:
A Boost-Glider with the booster is recovered by streamer.

Construction:
The quality of the materials was excellent. The instructions were clear and straight forward. The supplied jigs for wing dihedral were adequate, but I found I needed to secure them to the work surface (tape). I didn't like the plans for the shock cord mount, but that is a personal preference. It would be more than adequate for such a light weight, minimum diameter booster.

The glider built light and trimmed easily with some nose weight (supplied). My only trouble was, the plans suggest forming the airfoils on the leading/trailing edges of the glider before assembly. I found that when I assembled the glider I had to reform the edges to get an even fit. On my next glider I will probably form the airfoils after assembly. Be sure to trace the parts to the glider, I didn't and had to go out and buy another kit!!!!

Finishing:
I left the glider unfinished and just painted the booster a single color. I may use a clear coat of dope on the next glider for protection.

Construction Rating: 4 out of 5

Flight:
The glider needs to be trimmed before each flight session. The glider seems to be sensitive to heat and humidity, but is easily trimmed with the supplied clay. My glider flew perfectly straight, so I placed some clay on one wing to induce a circular pattern.

Motor recommendations are 1/2 A3-2T and A3-4T. I with both motors. With the 1/2 A3-2T I got very nice boosts to 100+ ft and excellent glides (2 flights). On the third flight with this motor, I failed to get separation of the booster/glider - recovery with no damage.

On the first flight with the A3-4T, I got perfect boost, separation and a beautiful long circling glide (much applause). For all the above flights the temperature was 80+ with a 5-10 MPH wind. On the final flight the wind picked up a bit and the glider just kept going like the energizer bunny. Nice big circles always a bit farther downwind... We tracked it down 1/4-1/2 mile stuck in a tree 30-40 feet up. This bird really didn't want to come down.

Recovery:
The only negative (as I saw it) was the shock cord mounting technique. The plans call for cutting 2 slots in the body tube and slipping the elastic through and knotting. I made my own Estes-type mount, but the thickness even further reduced the space for the wadding and streamer. I will have to device another means, but the booster is so light the it could free-fall without concern. I love the design of the glider!

Flight Rating: 5 out of 5

Summary:
I really enjoyed this kit, and went out and bought a second immediately (see note about tracing plans for glider!). There are no significant cons, and I can't express how much I enjoyed the flights!

Overall Rating: 5 out of 5

Flights

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