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>>> Hang glider SUNDOG

Bible home » Hang glider : Sundog

If you have additional information (ex: specificity of piloting, various characteristics...) on the hang glider Sundog by Michael Sandlin, you can supplement his card by adding your comment or write to us :

Hang glider card : Sundog
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Michael Sandlin
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[Translation of the original French comment]
The Sundog is a rigid wing that was designed by californian Mike Sandlin. Mike has now given up rigid wings and is on to flex wings again.
The Sundog is an evolution of the Skypuppy, another rigid wing of the same type.
here is more information from his website
"Sundog was a rigid wing I built to test the usefulness of flaps on a hang glider (see Hang Gliding, February, 1991). This version has full span flaps which fold under the wing for transport. There are spoilerons on the top surface of the wing for turning, actuated by side motion of the hang loop. The flaps were pulled down by a rope, just like the modern D-cell rigid wings of today. The tail surfaces are just fixed stabilizers. It was too heavy (90lb.s) and the static balance was non-existent (special launch procedures required), but it was fun to fly once you got it in the air. Full span flaps allow simple, easy landings, very similar to a drogue chute."

Also worth mentionning that before that, Mike had designed a Sundog with ailerons:
"These were up-only ailerons, actuated from the hang loop, then returned to neutral by a bungee cord (like the spoilerons, which came later). A good system, but I wanted bigger flaps."

M. Sandlin

My current glider website is

Good old Sundog, the one and only hang glider flown with full span flaps? Low performance landings are the easiest and safest.


no more contact the computer says unable to find pity because a lot of work was in that glider and the goat ect ..the x site had tail hangliders experiments but now gone .. skeatesy


New address for mike is:


The Litewing series attempted to turn back the clock to the era of 35 lb. hang gliders. This is hard to do with today's performance expectations, especially considering my crude sail making, but it was fun and adventurous. If you are going to be a hang glider test pilot you must have heroic legs!

Litewing at Torrey Pines,California

... refering to your other experiments on the x'site you needed a cannard on your aolus because it violates the 130 degree nose swivel spar angle rule so either go back to 130 degrees or add a small cannard out front as well to make the lift centroid arrive ahead of the g/g not behind as it does if the angle is wider than 130 degrees because what happens is the luffing occilations from the wing tips must travel faster than the total speed of the glider to be virrile enough to activate the tail incidence so no matter who much you try to over come this with higher incidence or more tail aera you must activate it on a flex wing and the only way is by makeing the nose angle less than 130 degrees or add a cannard or else the aircraft is imputant where as ridgid wings absorb this effect and get some activation on the incidence ... skeatesy

...Now the tail is attached to the main sail, as it was on my old Aolus. All the tailed gliders had strong trim forces; they always wanted to go fast when banked and required some pitch up force to stay slow.


the tweety hanglider ron wheeler scout has the same problem and needs a cannard as well to make it a triple tandem wing so it is positive in pitch and resists tail slides ... all aircraft could do well like the italian piaggio but dont use a lifting tail as designers try to do as it will end up divergent at some stage always use a symetrical tail with incidence or use the cannard either way this is the ultimate aerodynamics triple tandem wings...


is it available to buy ?


flexwing hangliders still dont use flaps except for the seedwing but no one is out useing the system and ridgid hanmgliders are useing them and tail flex wings are useing an elevator and some use a vertical tail but as of yet no flexwing is useing a complete tail and flaps and higher aspect ratio but it can be done to get past the restriction of reflex .. reflex on hangliders is the end of the line so you cant get any more performance so either they use a foam convex undersurface to lower the camber and reflex for higher aspect ratio or they use a tail .. i propse flaps like a parracuit on hangliders so smaller aereas can be use like the sky puppy ridgid wing down to 100 sq foot but that hasnt hapened either so hangliders are dead in the water as far as going any further ..skeatesy bubbygoddess 2019


flexwings can use a cannard to get past the reflex restriction for higher aspect ratios


thanks mike for doing all that work it saves repeating it when building new ideas .. the bible in revelation says the goats will be sorted out from the sheep maybe that means the ridgid wings from the flex wings since the 130 degree nose rule applys to flex wings but not the ridgid wings ..