Bearhawk First Flight

[jaredyates]

I don't have an explanation for why it works, but I'll say that I poor results with the flaps, primarily because they flex under a load. On the ground I might have an inch of deflection, but in flight that would become less as speed increased. And on top of that, the one inch deflection didn't look great on the ground. The one standard washer was pretty much the equivalent of the 1" of flap deflection. The aileron method is Bob's first choice, and he included it in the Beartracks ca 2006 I believe.

[Mark Moyle]

My PA20 static port lines... One on the transponder is about three inches long. The remaining instruments do not have static port lines. Airspeed is fairly accurate, vertical speed indicator is way the heck off. I'm in the process of rebuild and recover. Will install static 2 ports on the bottom side of the airframe just forward of the horizontal stabilizer. Piper uses glue on type...I've added brackets for the ACS sheet meat application. They look better. Mark M Sent from my iPad using Tapatalk HD

[DRLPatrol]

Jared, thanks. I learned something new. I sure wish I knew why it worked. Any you engineer types out there?

Doug

[Battson]

The washer under the aileron / flap hinge trick works because it's changing the achieved shape of the aerofoil, to increase the effective camber and therefore produce more lift. Alternatively you could put the washer at the bottom and reduce lift. Of course, either has a small effect on yaw trim.

The aileron is more effective than the flap because it's further outboard, and creates a larger turning moment. So a small washer can have quite a large effect.

[Mark Goldberg]

On this topic of first flights - a different 4 place BH took its first flight yesterday in Whitefish Montana. The owner called quite happy with his planes performance. He said it was quite the "sports car". Also, I just got an email from a customer in Michigan who is about to fly his 180 HP Bearhawk. So lots of new Bearhawks taking to the skies. Mark

[DRLPatrol]

Battson, I can kinda' see what you are saying but Jared said the other way. Raising the aileron (shim at lower hinge point) picks up the heavy wing. Sorry I don't mean to beat this to death I am just the kind of guy that likes to know why.

Doug

[Battson]

Depends which wing you are talking about! I have never done it myself so could have the theory backwards. It's been a long time since Bob explained it to me.
The other thing to remember is, when you move one aileron in a coupled system, the neutral position of both the ailerons will also move slightly i.e. the position where they sit in normal flight changes.

[DanWard]

I have Matco brakes on my Dakota Hawk......basically an LSA of 630 empty. Single puck would not hold for runup. 100 hp Rotax. I now have double puck and works fair. Not sure if double pucks would hold a Bearhawk of 1300-1500 empty. I did change geometry of brake cylinder attachment in relation to rudder pedal pivot. It helped. Matco website has discussions and pictures concerning how to do this. Also, Matco hydraulic brakes are high pressure. If yours are spongy it sounds as if air is still in the system. Bleed from caliber back into cabin cylinder if that is how you have it set up. Be generous with bleed fluid and go slow to allow air to move. I cannot push my brake pedals down by hand more that 3/4 ". Matco makes an attachment that will boost pressure but I have no experience with it.
Dan

[DanWard]

I have Matco brakes on my Dakota Hawk......basically an LSA of 630 empty. Single puck would not hold for runup. 100 hp Rotax. I now have double puck and works fair. Not sure if double pucks would hold a Bearhawk of 1300-1500 empty. I did change geometry of brake cylinder attachment in relation to rudder pedal pivot. It helped. Matco website has discussions and pictures concerning how to do this. Also, Matco hydraulic brakes are high pressure. If yours are spongy it sounds as if air is still in the system. Bleed from caliber back into cabin cylinder if that is how you have it set up. Be generous with bleed fluid and go slow to allow air to move. I cannot push my brake pedals down by hand more that 3/4 ". Matco makes an attachment that will boost pressure but I have no experience with it.
Dan

[Helidesigner]

Roll Trim Update - I put 2.5 gallons of fuel in the right aux tank. That creates the same lateral moment as me at 200 lbs in the left seat. The roll tendancy is almost gone. I'm surprised how much difference it makes. I know when I fly Cessnas and Pipers I do not see as much trim difference.I think I will just keep it there and pump it over when I have a passenger.

Mark
N83ME

[DesertBearhawk]

Love the color scheme, it's like you read my mind!