CEF speed contest Design Discussions

Cribbs74 wrote:4.6oz?

What did you use foam?   

Plane looks good

Actually the plan was for a foamboard fuse, but when I weighed it, it was the same as balsa... before stiffening. So I used medium grade balsa, the same as you'd use with any fuselage. I didn't take any special precautions. The wing is a Sig airfoil, pretty stiff stuff. I'm worried that if there is any wind, and there will be, it'll be too light. The engine is my 2013 Tach Racer with a new Texas Timers NV. A cox 5x4 prop for starters, I don't have anything special in that department.

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Looks like a part D/part C Mustang
Rusty

RknRusty wrote:I'm worried that if there is any wind, and there will be, it'll be too light.
Rusty

If anyone needs an extension due to weather pm me. Don't break your airplane in order to make a deadline that can be moved.

Jim

Looks Good Rusty I like yellow and that really brings the black into perspective , Nice and Jim ,Thanks, I am with Rusty I am going now to clear the field for 42 ft. lines , wind not bad now but not ready tomm. 9 mph.??   Off to mow   spanking    

Oops! Really. A serious head slapper.
I just realized that in my ridiculous haste, I've built positive incidence into the stabilizer. Probably 2 or 3 degrees. I hope I don't have to do my official with it rolling on the ground for the whole flight.  
Is there any rule that it has to actually leave the ground?

basackwards ??    I am glad I am not aerodynamic if it looks right fly it !!,,,if not change it to fly right   Man after all that mowing and jumping the mower off I am ready   Well that don't look like much but it WAS   I should have about 50ft. clearance Getback......

Damn dude, you got a control line field in your yard! Every boy's dream.

Test run. 18.8k with a 5x4 prop, yet to be cut down. I cut the stab out and re-set it with zero incidence. I feel better now. The old Tach Race engine runs great!

RknRusty wrote:Test run. 18.8k with a 5x4 prop, yet to be cut down. I cut the stab out and re-set it with zero incidence. I feel better now. The old Tach Race engine runs great!

It does my heart good to see another reedie with a bladder.  

Jim

JPvelo wrote:It does my heart good to see another reedie with a bladder.  

Jim

It's the only way to fly!

I walked across the street and staked my 42' handle in center circle, walked it around, and have plenty of room. The tree trimmers did a good job. The camera, plane and equipment are parked in my back yard, just waiting for the wind to die with the sinking Sun. Launch will take place in the next 45 minutes or thereabouts.
Rusty

Scrub.

Choir practice. EDIT: DUH! Easter activities. That explains it. I forgive them.

Picture of me scowling:

 Man I blew that up to see what you had in your left hand and almost // report this as offensive/adult content.............Sorry I cant stop having a good time   (still don't know) what's in the bag ? I know I am just asking for it so go head........  

Nice photo, your on a mission from God!

The video camera is in my hand. In the bag are three propellers, fuel, syringe, handle and lines, glow igniter, stooge line, rags, etc. It's all still in the bag. I'm po'd, nothing ever goes on at that church after kindergarten lets out at 6:00. Choir practice. I'd have given them a sour note for sure if I cranked up that Cox. It was blue sky and 5 mph wind.

Tomorrow's forecast could definitely be a go: 60% precip/10 mph. I'll be ready.
If it's a total scrub even through a possible extension, I'll fly it anyway and post a video for entertainment, and fly sooner next year.
Rusty

Don't worry Rusty,

I have made 3 attempts at getting airborne. Each one a dismal failure!

Last night winds were perfect and once again I did a nose over. This time I cracked the fuse lengthwise from the mount all the way to the bellcrank.

Something is very wrong with my plane. I am far away from home so that is compounding the problem. I have spread out my gear as my release guy said the engine torque is pulling the plane over and I plan on moving the gear forward a little bit more. I have no doubt it will fly once it gets off the ground. I have busted 3 props so I am running out.

I will re-attack Sunday. I have already spoken with Jim.

Ron

I tried to get mine in the air the day before yesterday in my neighbour's garden. It was quite a failure. Scale  landing gear and 1/2A don't go together well. As soon as the tail lifted, the prop touched the ground. There can be 2 reasons for that:

1. The landing gear is too low. Before, I held the plane in a for me horizontal position and it seemed to be OK. Probably, my impression of "horizontal position" does not match reality.
2. As with Ron's plane, the nose goes down. Then the landing gear is too far back.

As an emergency, I replaced the wheels and fixed 60mm diamater doped cardboard wheels to get a bigger ground clearance. I also fixed a M6 nut on the tail. I hope the CG is still OK. On the grass, I laid out wooden planks for approx. 3m. I think this might not be enough in length. How far a distance such a model usually rolls before taking off?

I'll try again today.

Lieven

cribbs.did you see ebay, 13 or 14 props,topflight,tornado,cox, with TD.rat

I just checked the weather. If I can be on my feet by 3:00 I think I can beat the rain moving up the Eastern Seaboard. The Kindergarteners won't mind if they're inside. The winds will be about 11, but that's workable if the rolloff from the buildings will let me keep it close enough to the ground. Determined to go. I'm thinking mine will jump up pretty quickly. It's balanced, wheels are forward and it's a featherweight.
Rusty

rat9000 wrote:cribbs.did you see ebay, 13 or 14 props,topflight,tornado,cox, with TD.rat

Thanks for the tip. I have a stupid amount of props at home, just not many here. I wish I had brought more, but I rarely break props these days. I should be ok once I figure out why my plane is being obtuse.

Ron

Lieven, my Polecat Racer runs about 2 meters before take off. I hold my handle in an up position.

Rémy

Lieven,
This is how I launched from a board. You'll notice the far end is lifted up about 6" to act as a ramp. Think of it as an aircraft carrier!

If you still have no luck go ahead and hand launch.

Jim