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Post by Burkeomatic on Jul 11, 2022 5:10:22 GMT
I am starting on the wings, I have all of one, and most of another bottom pannel cut out. Just waiting on flickr to decide it wants to load my photos.
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Post by bwarz on Jul 12, 2022 14:10:12 GMT
So flying last evening I discovered a deficiency in the design. So in skewering in the power pod, I targeted the skewers so they go through the bottom foam of the power pod (not through the bottom of the sides, actually through the bottom) so the battery can be velcroed right into the power pod - the ESC should mount to the bottom of the power pod as there is an airflow path to cool it too. But.... The power pod has a set of bottom guide in the fuselage core, but not top guides. The skewers in through the bottom of the foam board end up with a bit of slot to them. I'm not sure if its travel damage, hard landings, or just normal flight. But the motor/power pod ended up having enough slop in it to give the pod a degree or two of variable thrust angle (mostly up) which made the flight characteristics, well, interesting. Once I re-skewered it and better secured the motor, it flew better again, although i think it still needs an ever-so-slight bit of down thrust still (very little I'm guessing as it's not terribly annoying now). I should just glue the darned power pod in then I won't need to worry about it anymore I also have 1 oz of wheel weights (thanks to a fellow club member last night) in the bottom of the inside front of the cowl. That landed the CG quite nice with a 2200 3S right to the back of the rear shaft of the motor. That puts the CG right on top (not in front of) the front wing spar. Also, the 2200 3S running a 3536 1050kV motor spinning a 10x7 prop gave me 7 minutes of moderate flight to (don't yell at me, I hope I didn't destroy the battery) a 3% remaining battery (I reset my timer when I was planning on using a bigger battery and oops ran it on the 2200 for testing...) so I'd guess a 5 minute flight time would be safe. I have some nylon little washers about the ID of a BBQ skewer I typically glue around the holes where the skewer slides through, that helps keep the hole in the foam from egging out. I honestly hadn't even got to that yet, but thanks for the heads up. I'll try to adjust for downthrust. I honestly had the same problem with the F6F and glued it in. But, I think I will rant a little. In building these intricate planes, I think having a swappable power pod is a design limitation we took from flite test that we impose on ourselves for no good reason. Think about it, how much do you (or most people) swap a single motor and ESC between planes? Not a lot. What about sapping receivers? Typically we just fly planes until they die, then swap the electronics over to others then. Anyone that has more than $40 a month to build a plane probably doesn't swap motors a whole lot. The kids just starting out are probably just happy if they can get a plane in the air for 5 minutes and are probably using something like this. totsrc.com/products/a2212-1400kv-motor-30a-esc-3s-esc-deans-xt60-rc-plane-heli-drone-fpv-wingIt might be an interesting to make a poll on the FT forums to see how many actually use the swappable functionality of their power pods. yea I've actually thought about that (the power pod swapping). I've done it exactly once - moved it from my 109 to the first build of the p36 cuz I was in a crazy hurry to go out and test fly and was too lazy to build another. Ended up being a problem cuz I built the first gen 109 wrong and the thrust line in the power pod was low by 5mm and it made the maiden test of the original P36 a mess . The pod design does make a nice place to mount the battery tho... Probably going to just glue the darned thing in - that'll keep it from moving
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Post by ratcheeroo on Jul 12, 2022 15:30:05 GMT
So flying last evening I discovered a deficiency in the design. So in skewering in the power pod, I targeted the skewers so they go through the bottom foam of the power pod (not through the bottom of the sides, actually through the bottom) so the battery can be velcroed right into the power pod - the ESC should mount to the bottom of the power pod as there is an airflow path to cool it too. But.... The power pod has a set of bottom guide in the fuselage core, but not top guides. The skewers in through the bottom of the foam board end up with a bit of slot to them. I'm not sure if its travel damage, hard landings, or just normal flight. But the motor/power pod ended up having enough slop in it to give the pod a degree or two of variable thrust angle (mostly up) which made the flight characteristics, well, interesting. Once I re-skewered it and better secured the motor, it flew better again, although i think it still needs an ever-so-slight bit of down thrust still (very little I'm guessing as it's not terribly annoying now). I should just glue the darned power pod in then I won't need to worry about it anymore I also have 1 oz of wheel weights (thanks to a fellow club member last night) in the bottom of the inside front of the cowl. That landed the CG quite nice with a 2200 3S right to the back of the rear shaft of the motor. That puts the CG right on top (not in front of) the front wing spar. Also, the 2200 3S running a 3536 1050kV motor spinning a 10x7 prop gave me 7 minutes of moderate flight to (don't yell at me, I hope I didn't destroy the battery) a 3% remaining battery (I reset my timer when I was planning on using a bigger battery and oops ran it on the 2200 for testing...) so I'd guess a 5 minute flight time would be safe. I have some nylon little washers about the ID of a BBQ skewer I typically glue around the holes where the skewer slides through, that helps keep the hole in the foam from egging out. I honestly hadn't even got to that yet, but thanks for the heads up. I'll try to adjust for downthrust. I honestly had the same problem with the F6F and glued it in. But, I think I will rant a little. In building these intricate planes, I think having a swappable power pod is a design limitation we took from flite test that we impose on ourselves for no good reason. Think about it, how much do you (or most people) swap a single motor and ESC between planes? Not a lot. What about sapping receivers? Typically we just fly planes until they die, then swap the electronics over to others then. Anyone that has more than $40 a month to build a plane probably doesn't swap motors a whole lot. The kids just starting out are probably just happy if they can get a plane in the air for 5 minutes and are probably using something like this. totsrc.com/products/a2212-1400kv-motor-30a-esc-3s-esc-deans-xt60-rc-plane-heli-drone-fpv-wingIt might be an interesting to make a poll on the FT forums to see how many actually use the swappable functionality of their power pods. Yeah the swappable power pods are definitely a weak link, its been a long time since I have done that
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Post by Burkeomatic on Jul 18, 2022 5:24:11 GMT
2022-07-18_12-08-16 by Burkeomatic, on Flickr It came to my attention that I should have installed the braces between the spars before i installed both of the spars.... Live and learn, it should be fine.
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Post by Burkeomatic on Jul 21, 2022 4:20:41 GMT
I have some nylon little washers about the ID of a BBQ skewer I typically glue around the holes where the skewer slides through, that helps keep the hole in the foam from egging out. I honestly hadn't even got to that yet, but thanks for the heads up. I'll try to adjust for downthrust. I honestly had the same problem with the F6F and glued it in. But, I think I will rant a little. In building these intricate planes, I think having a swappable power pod is a design limitation we took from flite test that we impose on ourselves for no good reason. Think about it, how much do you (or most people) swap a single motor and ESC between planes? Not a lot. What about sapping receivers? Typically we just fly planes until they die, then swap the electronics over to others then. Anyone that has more than $40 a month to build a plane probably doesn't swap motors a whole lot. The kids just starting out are probably just happy if they can get a plane in the air for 5 minutes and are probably using something like this. totsrc.com/products/a2212-1400kv-motor-30a-esc-3s-esc-deans-xt60-rc-plane-heli-drone-fpv-wingIt might be an interesting to make a poll on the FT forums to see how many actually use the swappable functionality of their power pods. yea I've actually thought about that (the power pod swapping). I've done it exactly once - moved it from my 109 to the first build of the p36 cuz I was in a crazy hurry to go out and test fly and was too lazy to build another. Ended up being a problem cuz I built the first gen 109 wrong and the thrust line in the power pod was low by 5mm and it made the maiden test of the original P36 a mess . The pod design does make a nice place to mount the battery tho... Probably going to just glue the darned thing in - that'll keep it from moving Quick question, how did you run your trademark paper tubes through the wing, presumably you punched holes in the supports between the spars, right
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Post by bwarz on Jul 24, 2022 1:24:43 GMT
yea I've actually thought about that (the power pod swapping). I've done it exactly once - moved it from my 109 to the first build of the p36 cuz I was in a crazy hurry to go out and test fly and was too lazy to build another. Ended up being a problem cuz I built the first gen 109 wrong and the thrust line in the power pod was low by 5mm and it made the maiden test of the original P36 a mess . The pod design does make a nice place to mount the battery tho... Probably going to just glue the darned thing in - that'll keep it from moving Quick question, how did you run your trademark paper tubes through the wing, presumably you punched holes in the supports between the spars, right yes, I cut a slot in the top of the spacer. not sure if the link will work or not, but check page 2 on the ft forum for the build.... forum.flitetest.com/index.php?threads/another-ms-design-the-curtiss-p-36.68763/page-2rusty on my bbcode and reply is wonky on my phone tonight, hope it works
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Post by Burkeomatic on Aug 13, 2022 4:50:33 GMT
You know what, I was scrounging for some wood to get the landing gear done, and then I realized, this needs to happen. Think I like this one better.
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Post by ratcheeroo on Aug 13, 2022 12:19:16 GMT
Very cool!
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Post by Burkeomatic on Aug 17, 2022 3:34:07 GMT
I think i am getting closer to the finish line. I started putting spackle on it to cover those dents up from an untimely fall, and I am getting the wing put together, I just need to cut out those little spacers toward the back, and cut the skins out, and the bottom wing will be done. Then it should really be electronics and detail work.
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Post by Cannonball on Aug 31, 2022 20:39:02 GMT
FYI - I never use the swappable power pod. Motors aren't that expensive. Also, I've taken to using BBQ skewers as spar reinforcements. No need to bend them just overlap them at the dihedral. Put two on each spar and you'll be bombproof.
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Post by Burkeomatic on Sept 1, 2022 4:29:49 GMT
FYI - I never use the swappable power pod. Motors aren't that expensive. Also, I've taken to using BBQ skewers as spar reinforcements. No need to bend them just overlap them at the dihedral. Put two on each spar and you'll be bombproof. Yeah, I like to use bamboo skewers like that, I have nice 36 inch ones I buy from walmart that are 1/8 long. Honestly, I had a 3lb fpv plane that had no spar reinforcement and it was fine. That being said, I am about to get the wings together.
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Post by Burkeomatic on Sept 3, 2022 17:00:36 GMT
bwarz what part of the wings did you say didnt match up? Went pretty well for a low wing plane like this. White gg will fill the small space there and I didnt have to do any additional cutting aside from cutting about a quarter inch from the front of the inner body. Once I cut it out, it was perfect. Could have easily been my mistake somewhere along the line.
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Post by bwarz on Sept 3, 2022 19:47:25 GMT
it very well may have been me with too much squish on the leading edge of the wing too when I built it - my gap was the curve of the LE of the wing where it met with the fuselage - where you had to cut a shade off. Either way, if you take the patience to do the wing fillets they'll cover the whole edge where the wing meets the fuse. Looking good (and I hope it hasn't been too much of a PITA )
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Post by Burkeomatic on Sept 3, 2022 19:57:32 GMT
it very well may have been me with too much squish on the leading edge of the wing too when I built it - my gap was the curve of the LE of the wing where it met with the fuselage - where you had to cut a shade off. Either way, if you take the patience to do the wing fillets they'll cover the whole edge where the wing meets the fuse. Looking good (and I hope it hasn't been too much of a PITA ) The only parts I am worried about is where I screwed up the paper. The plane has went together just fine. I have a big bubble on the left rear of the fuselage, and there is a couple other weird spots going on. Honestly, this is pretty straight forward, what takes the most time is cutting parts out, it would go together in a breeze if you had a laser cutter.
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Post by Burkeomatic on Sept 7, 2022 5:04:41 GMT
I have the front cowl mocked up while it is still drying. That last skin required minimal trimming, maybe 1/16 each side? No biggie, I wouldn't worry about changing it up a whole lot. Of course, I had to mock the motor up too. It mounts perfectly flush with the 3536. That master airscrew 11x5 looks like perfection on it.
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