Hello RCU;Just about to start a Sig King Kobra. Setting it up with am OS65AX, Macs tuned pipe and retracts. Looking for advise on the retracts. Contacted Sunair about the recommended model 202HD air retract set (not bad for $160.00) and they are in stock. If any of you have advise on a different type of retracts or other building techniques please let me know. Thanks for any help.

I don't have any advise on the retracts, but I happen to have a King Kobra NIB, so I will be watching your thread....

I have a deep affection for SIG kits so I also will be eagerly watching!

Here is a great King Kobra build that includes retract installation if you decide to install them http://www.rcuniverse.com/forum/m_64..._1/key_/tm.htm.

Thanks to all. Building should start next week. Still researching some retracts. The like to the Kobra build did not work. I will try to find it on RCU.

I would consider facing the formers with 1/64" Lite ply. The Kougar formers break or crack easily with a hard landing. The wing is indestructible. The King Kobra is a great flying airplane.

I don't use retracts but would like to purchase your wire gear.

We will watch your progress with interest.

Bill

I built this for my son some years ago, a good looker/flyer with the the gear tucked.

Donny, wow that looks great what retracts did you use?

And how did you get enough clearance in the nose for the nose gear and fuel tank?
Jim...

P.S. Nice plane!

ChesterbJimIinca

The landing gear mains are B@D's, the nose wheel asm. is spring air.

Clearance is solved by mounting the fuel tank further back thru the top of the fuse. with a hatch beneath the canopy. we did the same thing with the SIG kobra a smaller plane....which was absolutely fast and awesome in the air but no muffler, too nose heavy. it would roll real fast with the gear up. look for the thread on the kouger in this forum.

Both are real clean and impressive sights with the gear tucked just beautiful!

For the Kougar or King Kobra I would consider a built up balsa 'chin block' to simplify thinning the bottom inside of the block. I might also consider making the bottom of the chin a screw on hatch. Battery location would influence the hatch decision.

You have probably already considered single or dual aileron servos. I have both single aileron servos on some Kougars and dual aileron servos on others and cannot distinguish any difference. All of my aileron servos are inside the fuselage but some prefer aileron servos in the wing. Flaps would have been a nice addition and could have been driven from the torque rods using a single servo. If I knew how I would attempt to retrofit a split flap on about 20% of each aileron.

After more thought I would definitely face both sides of the former in which the wing dowels fit.

Bill

I used E-flight 60-120 size electric retracts on the one I built last year. Easy install and strong.
Nothing says it like a photo.

I have a full-size plan for the Sig King Kobra. These kits are not currently available from Sig. Could someone please trace the wing tip profile of the foam wing core, or tell me how thick the wing tip is? Does anyone make foam cores for the King Kobra? Thanks!

I would make two changes to the stock wing. First, get rid of the washout. Then ditch the stock tip airfoil. I would reduce the tip thickness by 2% or 3%, move the high point forward 5% and increase the leading edge radius. IMO these steps would make it a more enjoyable airplane. You could even get a bit crazy and anhedral the stab. That has the potential to decrease the rudder/aileron control couple.

Thanks for the input on the wing changes. Are you saying to reduce the root thickness by 2 or 3% to get the new tip thickness, or reduce the stock tip thickness by that amount? I don’t have the stock tip profile, just the root.

Reduce and modify just the tip airfoil. By cutting a foam core wing, the airfoil will transition along the wingspan so in affect you are changing the entire wing.

Sounds good. Would you have the pattern for the stock tip, as I have nothing to start modifying at this point. Thanks!

Unfortunately I don’t, but if you get one I will be happy to help with the mods. I’m going to a swap meet this weekend and I can look for a kit and take a tracing if I find one.

Kabulrocks

I have a kit available, NIB. I'd sell for 250+shipping if you're interested. Let me know. Scott

I also have a kit new in box.