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Chipmunk Brotherhood.

Old 04-18-2024, 02:29 PM
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Originally Posted by RICKSTUBBZ
Sure is looking nice!

I bet there are not very many people with an engine test stand like that one.
Being on wheels, I just need to add some big servos to steer it!
Old 04-19-2024, 12:57 PM
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Break in went well; Stinger 125cc:



Old 04-19-2024, 01:14 PM
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How big is that baseball bat you have bolted to the front of that thing...

Put some elevons and maybe a vertical stabilizer between the bottom shelf and the top shelf and you might be able to fly that table...
maybe take the vise off for balancing purposes?

The way you are going, the Chipmunk will be in the air soon
Old 04-19-2024, 01:32 PM
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Prop is 29". I was thinking of putting servos on the wheels, jumping on the table and driving it around like a flying carpet. . .flying door-table I guess.
Old 04-26-2024, 07:55 AM
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Still making progress. Getting all the wheel pants, fairings

, cowls and such ready to paint.
Old 04-28-2024, 11:24 AM
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Trying to get everything except the radios/batteries so I can see what I need to do for CG. Going to build a real simple CG jig. Graphics are a little off in size but that's ok. I don't plan to be entering any scale contest. The 3d printed strut covers worked well and I 3d printed mounts for the wheel pants.



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Old 04-28-2024, 11:48 AM
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You are moving right along !
Won't be long and that thing will be in the air?
From what i am seeing, you must have printed the pilot as well, or at least parts of him?
Old 04-28-2024, 12:00 PM
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Originally Posted by RICKSTUBBZ
From what i am seeing, you must have printed the pilot as well, or at least parts of him?
Yea I downloaded him online. I adjusted him for size and he was huge. I had to do it a second time. I printed his arms same scale and they did not look right so I printed the arms slightly smaller.
Old 04-29-2024, 03:01 PM
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I made a very simple jig for locating the CG. This will help with placement of everything. I used a round aluminum rod rubber banded to the spars. The center of the rod is located on the desired CG. A simple stand I can move forward or back until it balances. Simple.





Old 04-30-2024, 03:03 AM
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I always found it difficult balancing low wing planes up right and was wondering how you got it to balance. I understand now after looking over the second photo.
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Old 04-30-2024, 05:32 AM
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do you have a bridgeport and a lathe hanging out in that shop somewhere?
making stuff like that jig is half the fun for me....

i was confused at first until, like Tony, I saw the last photo, realizing you have the wings pulled out....
Old 04-30-2024, 06:54 AM
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Originally Posted by RICKSTUBBZ
do you have a bridgeport and a lathe hanging out in that shop somewhere?
making stuff like that jig is half the fun for me....

i was confused at first until, like Tony, I saw the last photo, realizing you have the wings pulled out....
I have a lathe but that was just tubing cut and welded with grinder. I am pretty good with basic metals. I restored the NASCAR in the background which included cutting off the old steel body and fabricating a new steel body among other things. The NASCAR is going to be auctioned of at Mecum Indy mid May.

I may get my wife's scale so I can can see what it weighs. It will allow me to calculating balance of the rest of the components.
Old 04-30-2024, 10:55 AM
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Ran some initial numbers on the CG. I am paying for putting 2 servos in the tail as I expected. Fuel and smoke tank will go on CG. I will have to work hard to keep everything as forward as I can. Laying it out as I have done in the spreadsheet brings me to needing 21oz in the nose. I think I can get some stuff further forward than listed but this gives me a good outline of what I am up against.



Old 05-01-2024, 04:51 AM
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So you weight is coming in at 34 pounds? I believe I read some in low 40's.
Old 05-01-2024, 05:51 AM
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That's what it looks like.
Old 05-01-2024, 08:18 AM
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Just noticed, the column that says "CG" should say "moment". The arm is the CG.
Old 05-01-2024, 12:01 PM
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This is labeled more correctly:


Old 05-02-2024, 12:17 PM
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It's not done yet but it was a nice day to get it out of the hanger for the first time for a photo:


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Old 05-03-2024, 03:37 AM
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Looks great.
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Old 05-24-2024, 11:57 AM
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Ready for maiden flight. PVC jig so I can put in truck without moving around and bumping into anything.




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Old 05-26-2024, 01:46 AM
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Looks good, Happy landings
Old 05-26-2024, 09:47 AM
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Thanks.
Old 05-31-2024, 08:57 AM
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I put the first two flights on the Chipmunk yesterday. What a great flying plane. I does a wonderful stall turn and a pretty nice lomcevak! Someone took a first flight video which is on the Evansville rc club FB site but I am not a big fan of maiden videos. I loosened up a lot more on the second flight but I do not have a video of that. After I get settled in with the airplane I'll see if I can get a video. Sweet flying plane!

Last edited by gow589; 05-31-2024 at 09:38 AM.
Old 05-31-2024, 12:41 PM
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Great news
looking at video now
Old 06-09-2024, 05:52 AM
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Here's flight 3. Still doing some trimming. I'm a little sloppy at some things but you can see how well the airplane flies!

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