Originally Posted by wamsy55

http://www.youtube.com/watch?v=thafZ...hannel&list=UL

Here is some video of me flying my Vyper Bipe. Please excuse the rusty thumbs. Next weekend if the weather is good I will get out the HD cam and do this plane justice.

Nice flying Wamsy

I wish my thumbs were that rusty

I've seen a few engines do this, usually its a pressure in the cowl problem that can be fixed by soldering a nipple on the hole that is over the diaphram side of the carb and running a tube either inside the fuse or in front of the carb inlet.

Originally Posted by quadracer

Anyone ever had their GT33 four-stroking/bogging in negative G maneuvers? Mine was doing it today while Hugo was flying it, and I'm curious if anyone else has had this happen, and what to do to fix it.

Originally Posted by alexjschauer

How long has 3DHS had this?
I've never seen it
http://www.3dhobbyshop.com/120-Extra...e_p_16015.html

We've had one for a while

http://3dhsda200extra120.shutterfly.com/

Good idea, but wouldn't it still do it in positive G maneuvers if it was cowl pressure? I ain't saying you're wrong, but it just seems like cowl pressure would only be affected by forward airspeed, and not the attitude of the plane.
I don't think the GT33 has a hole in the plate that you're referring to. It has a fuel line tapped straight out of the crankcase and into the carb.

Originally Posted by quadracer

Anyone ever had their GT33 four-stroking/bogging in negative G maneuvers? Mine was doing it today while Hugo was flying it, and I'm curious if anyone else has had this happen, and what to do to fix it.

Its usually from not having enough openings for the air to exit from the engine area.

I've usually had that problem when the plane is in KE or inverted. And as Jim said, if you don't have enough air exit holes you will have problems too. Make sure you have 3x more exit area than enterance.

Originally Posted by quadracer

Good idea, but wouldn't it still do it in lpositive G maneuvers if it was cowl pressure? I ain't saying you're wrong, but it just seems like cowl pressure would only be affected by forward airspeed, and not the attitude of the plane.
I don't think the GT33 has a hole in the plate that you're referring to. It has a fuel line tapped straight out of the crankcase and into the carb.

Originally Posted by jsmith285

Its usually from not having enough openings for the air to exit from the engine area.

I have both of the vented panels on the tunnel, is that not enough? It's a 72 SC.

More 71'' Slick action

3DHS 71'' Slick (5 min 1 sec)

nm...got it handled

Originally Posted by hone1er

More 71'' Slick action http://www.youtube.com/watch?v=wjeWA...ature=youtu.be

Nice flying!

Originally Posted by wamsy55

Nice flying!

Thanks dude!

Wish l could watch videos. I don't have an internet connection good enough too at home

Originally Posted by losifanatic

Wish l could watch videos. I don't have an internet connection good enough too at home

You missed two good ones! Joe just ripped it up on his new 71 Slick and Wamsy did his typical magic with the Byper. These guys make me feel like a beginner!!

Today's lesson learned: if you are making a low harrier pass downwind and get the urge to turn and come back upwind, anticipate what the wind will do to the plane in the turn first :-)

Today's question: I now have a xoar beechwood 14x7 prop with a notch in one blade that's about 3/32 long and 1/32 deep. And damage on the outer 5/8" of the other blade that is mostly in the 1/32 depth range but gets up to 1/16. No splitting visible. Do I clean up the edge a little, balance it, and fly? Or is it safer to just toss it?

Get rid of it