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Scale 50cc Scratch Build From My Own Design Revisited

Wacobipe

100cc
This is the same post as I made in the I'm going flying thread in case you've already seen it.

Well after more than 3 1/2 years since the day I glued the first pieces together, my scratch build project "Miss Moana" flew today!!!

When I got to the field this morning the wind was barely blowing. I assembled the airplane and the second I hit the switch on the fuel pump to fill the tank the wind started blowing. By the time I rolled it out to the starting area the wind was blowing pretty good. A bunch of people had showed up to see the maiden, so I decided I was at least going to start it and let it run for a bit and wait for the wind to die down. It took forever to start. Way harder than usual for a DA50. We flipped and flipped for quite a bit and finally it popped on the choke. Turned the choke off and flipped and flipped and flipped and it just wouldn't start. My partner in crime Tony suggested we let it sit for awhile, so we stopped for a few minutes and rested our weary arms. When I turned everything back on and he gave it a flip, it started right up. Crap like that only happens when you have an audience.

We let it run for awhile and it seemed to run just fine. I shut it off and we were standing around talking when I noticed the wind had died down. I asked Tony what he thought and he gave me the nod so I told him lets give it a try.

It started right up and seemed to be running great, so it was time. I taxied out and pointed it into the wind and started to roll on the throttle. I let it take off when it wanted to, since it weighs as much as a small anvil and horsing it off the ground could possible go badly. It took off just fine and wasn't horribly out of trim which was nice though it did need some right aileron and a click or so of down.

In the air it's a bit elevator sensitive, so it could be a bit tail heavy, but I forgot to do the 45 degree inverted climb test to see. After flying around for awhile I decided to make a few approaches and see how it felt. After the first slow pass I decided since the wind was picking back up again I shouldn't push my luck and go ahead and land. I came back around and made my approach . When I got it lined up I slowly came off the throttle and and it settled in nicely until it was about 3 feet off the ground and it just kept floating with all that headwind. I didn't think pigs could float that well. ;) It finally made a nice smooth touchdown and I was a very happy camper.:)

I wasn't all that nervous before the flight, but my thumb was a bit shaky after takeoff, but that went away after I could tell it was flying well. But after I landed I could barely get the pin flag back in the hole to shut it off.
:lol2:
It was pretty windy so I only flew it once, but I was very happy with how it did. There are so many things going through your mind on a project like this. Did I get the thrust right, the incidence, the balance and a hundred other things when your the guy that designed it.

There are a few things I need to look at. I need to take a look at the wheels because it really doesn't roll all that well for some reason. I had several clicks of right aileron trim in it, but it still needed a little more. I looked after I landed and you could barely tell I had put any trim in it. I was expecting to see a lot. The trim steps must be set pretty small in the transmitter. It needs more expo on the ailerons and elevator.

All and all I'm extremely happy with how today went. It flew well and nothing blew off.;)

I have no video, but a friend did take some in flight pictures that he's going to email me, so I'll post them when I get them. Here is a before and after picture , I'm very happy that they look so much alike.:D

View attachment 97064 View attachment 97065
Woop!
 

Jetpainter

640cc Uber Pimp
Tonight I put Miss Moana back in the workshop and did a little tinkering. I added some straws to make it easier to tune and checked everything over.

Tomorrow night I'm planning to check the elevators and make sure they travel evenly. I don't think I had then exactly even.

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Snoopy1

640cc Uber Pimp
That looks nice and neat. Now to the holes perfectly lined up with cowl. The last one I did I used laser pointer and it worked out great.
 

Jetpainter

640cc Uber Pimp
Tonight I check to make sure the elevators traveled the same. I should have done this before, but I didn't. They were relatively even at neutral when I started, but the right one had more travel up and down. All better now.
20170628_195352_resized.jpg


After fixing the elevators I installed my nose art. Miss Moana lives!

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Jetpainter

640cc Uber Pimp
20170702_164644_resized.jpg
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As some of you may know if you saw my post in the "I'm going out flying" thread I took Miss Moana out yesterday and it turned into a very frustrating day indeed. For those of you that didn't see that post the first flight went well, other than the engine being rich. I did test the CG in a 45 degree inverted climb and it is tail heavy. The frustrating part came after the flight when I went to pull the hatch off to let the pipe cool and check the fuel. On the third of four screws it turned several turns before I heard a "POP" and the screw went back into the hole. We worked on it for over an hour and couldn't get it out. I ended up borrowing a hack saw blade from a guy and I was able to get the hatch just high enough to cut off the tab and get the hatch off.

When I got it home, I finally did get the screw out, but even with being able to get to the back side now that the hatch was off, it fought me the whole way. The threads on both the screw and the nut don't look bad, but they're definitely screwed up.

Well I guess that's what I get for being an idiot and not epoxying them in.
 

Jetpainter

640cc Uber Pimp
Repairing the tab I had to saw off shouldn't be too hard, I'll Dremel out the leftover part in the hatch and make a new one. We did some damage to the outside trying to grab the bolt with pliers to put some pressure on the blind nut to get it out, with no luck. To get the hatch high enough to get the saw blade in there the bolt head also did it's own damage to the outside. None of it is that bad, just a pain.

I need to change the balance before I fly it again. I'm going to replace the aluminum stab tubes with carbon fiber ones. If I can knock an ounce of at the stab, that's like adding 4 ounces or more to the nose. I'm also going to switch out my Falcon 23 x 8 for either a Mejzlik 23 x 8 or a 22 x 10, I have both. The Mejzlik 23 x 8 is over an ounce heavier than the Falcon, that's not much extra nose weight, but every little bit helps. Doing those two things makes a 5 ounce difference in the nose without any additional weight.

I searched for more than an hour on the Internet last night trying to find carbon tubes that will work. These are Aeroworks tubes, and them and Graph Tech are the only ones that made a 12.5 mm thin wall carbon ones. Aeroworks probably got theirs from Graph Tech. Since they are no more it makes things much harder. I found several that were the correct outside diameter, but not thin wall thus no weight savings, but I'll come up with something.
 
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