I just finished my MK Curare, have to pick up the spinner at the LHS, and just finished running up the engine. Need some info on initial throws. Plans don't call for any but I figured it would be a good idea to start with some knowns if you guys wouldn't mind giving me your setings.

MK Curare, (original parts still in box)
ST61 PDP Bluehead with old flow thru muffler, jeez is it loud!
6lbs, 6 oz dry weight
Yeah, I know it needs a few stickers or stripes, I'll get there, but after waiting 30 years to find this kit whats a few more days? Thanks in advance for any info.

Ed

Congratulations!!!

Nice job!!
Keep us updated on the maiden flight.


DM

Outstanding job! That is super light. What retracts did you use and are you going to hang a pipe on it?

Elevators: 3/8" up and down
Ailerons: 1/4" up 5/16" down
Rudder: 2" L & R

This is a good starting point. The ailerons on mine needed a touch of differential, hence the difference up and down.

Nice looking plane! You did a nice job Just curious, is that the battery switch behind the muffler?

Yes, that is the switch, wasn't sure where to put it when building. Next time it'll be further back and on the other side.

Ed

Differential is usually "more up than down" Occasionally reverse differential is needed but is rather unusual. Did you find that your (very nice) Curare required it.

Ray

"ST61 PDP Bluehead with old flow thru muffler, jeez is it loud!"

I have that exact muffler on one of my Blueheads. I don't know why they call it a muffler, because it doesn't. I took mine apart and screwed a large sheet metal screw into the flow through venturi from the inside. That quietened things down a lot but unfortunatly also robbed quite a bit of power.

The good news is tha most any 60 sized ST muffler will fit this engine.

Great looking plane!

Yes, the latest mufflers fit. They look a bit anachronistic, but are quiet.

David

Yup! It was strange to me too, but the reverse differential actually helps.

Are y'all plugging one aileron servo into #1 and the other into #6 to set differential, or are you doing it mechanically?

David

Our Curare is 27 years old, the original radio didn't have dual rates. The differential is mechanical. IIRC we bent the torque rods slightly forward toward the servo to give that amount of differential.

Sorry - can't seem to post images at the moment. Anyone know how to delete a complete post.

Ray

They were probably re-booting the image server or something like that. I had trouble earlier but it's working now.

David

Thanks David, i'll try again.

This is the only model on which I have ever used "reverse" differential. Own design Enya 35X powered flying wing. Dead easy to build and great fun to fly - who needs tailplanes.

Ray

Ed,

Stickers or no stickers, that is one sharp looking Curare!! I'm also curious to hear how it flies.