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Discussion
A really big living room plane, using off the shelf components
Hi everyone, I usually hang around the high performance part of the forum, but today I decided to make a living room flyer instead of another micro speed plane!
I dreamt up the design and threw this thing together in a single afternoon and it flies pretty well. It's got a 55cm wingspan and an AUW of 17g with a 50mah lipo. The plane can easily handle a 150mah lipo, it'll still fly in my living room. I've built a super light small living room flyer before, but I wanted to try and build a lrf without using specialized tiny lipos and handwound actuators. This plane uses a small off the shelf 4ch receiver with built in 1s brushed esc (not plantraco or Deltang) and a standard 1.5g linear servo. The motor is a small off the shelf 6mm geared pager with a 4" t mount quadcopter prop. The plane was built around a 2mm carbon tube (way too strong and heavy, but that is all I had left). The rest of the plane is a mix of 0.5, 0.7, 0.85 and 1mm carbon rods. The wings have been covered with 2 micron Mylar. If anyone is wondering why the wing setup is so weird: the plane started out as a monoplane, but I wanted it to be slower so I added another wing on top. The top wing is smaller because I didn't have any more light carbon left over! The plane is almost completely see-through, so it's very hard to photograph. I did manage to capture it on video though, I even managed to fly it outside during a (very very rare) no wind moment. Tomorrow, I'll try to film the plane flying around the living room as well. I already managed to hunt down a brushless version of the same receiver, as well as some commercially available 1.1g servos. Those will be used on the next version. Outdoor flight video (using old 7mm DD motor instead of 6mm geared)
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Last edited by basgerritsen; Jul 25, 2021 at 04:28 PM.
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And here's a video of the plane flying in my living room. It needs quite a bit of up-trim in order to keep the nose up during sharp turns, the next version will definitely get an elevator so I can manouver it a bit better.
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I've never flown a vapor but it definitely looks fun!
On the next version of this plane I'll use some 1.1g servos and a brushless motor and i'm definitely going to add an elevator. If you think the square nine is slow, you should see my 40cm LRF (loosely based on f1d planes, not not nearly as advanced), it makes the square nine look like a rocketship. I got some lighter balsa so I'm rebuilding this plane right now (this one was build from very heavy balsa). I'm changing the fuselage structure a little bit and the wing will get some curved ribs.
I saw one of your old square nine videos a while ago, what covering material are you using these days? |
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Last edited by basgerritsen; Jul 30, 2021 at 04:11 AM.
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Good stuff! I’d like to try larger but am concerned with the maximum weight with a 4mm drive. Choosing balsa can be a challenge though.
I used heavy guillows tissue and also tried transparent household film. That was actually lighter. The one I built now is a 2mm beaded foam wing and light 0,85 gram 30 mA batteries. Fun! Looking at a balsa with Gampi tissue build now also. Gampi is about half the weight of the Guillows tissue |
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You don't have to worry about the maximum weight, as long as your plane is efficient, it'll fly just fine on a 4mm geardrive.
That 40cm plane needs very little power, it can cruise around at 50% with a 4x10mm motor+6:1 gearbox and 76mm prop. It flies for 8 minutes on a 28mah pack. Those square tips on the square nine are murder in terms of efficiency! Choosing balsa takes some, I frequently visit all the hobby stores in my area and I weigh all their good looking balsa. I'll take all the exceptionally light balsa that isn't incredibly weak. Have you ever tried using 1mu mylar or os film? That's much lighter than any kind of tissue. |
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> On the next version of this plane I'll use some 1.1g servos
What's your source for a 1.1gm servo and do you have one in hand yet to verify it really is 1.1g? Advertised weights can be rather misleading. Oversky advertises a 1.1 gm servo (OS1300), but it is only that when you replace the wire harness with magnet wires and no connector (soldered to Rx), otherwise they are about 1.45gms. Don't get me wrong, I love the Oversky servos and have over a dozen of them in use in various planes from 10gms to 30gm AUWs, but like most sources, their advertised weights should be taken with a grain of salt. Then again, advertised 1.5gm servos are typically much closer to 2.0gms. Did you weigh your 1.5gm servo? Tim |
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Tim you're absolutely right!
My 1.5g servo weighs about 1.9 grams and I'll be using the oversky "1.1g" servos, which do weigh 1.5g with connector. I'm no stranger to direct soldering servos with 0.1mm magnet wire, so, if for some reason, the extra few tenths of a gram becomes a problem, I'll just direct solder them. When doing weight estimates for a new build, I do use the "real" weight of a Servo+ some margin for glues etc. AFAIK, all the sub 3g servos are 0.2-0.5g heavier than advertised, but I thought it'd get really confusing for people trying to make a similar plane if I were to use the actual weight of the specific servo I used on a build, instead of just using the "marketed weight". But it's very good that you mentioned this, because some might not know that these tiny servos are definitely heavier than advertised! |
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Last edited by basgerritsen; Jul 31, 2021 at 11:54 AM.
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2.1g!
This is my latest LRF build, a 2.1g carbon stick model.
I'm using my brand new 10mah lipos, they are perfectly capable of powering this model. I made my own 4x8mm pager geardrive with a 2.3" balsa prop (carbon spar) the receiver is a deltang rx41, so it isn't the lightest receiver around. This one even slower than the large 4.6g plane. Did I forget to mention it's got a 20cm span and a full flying rudder?! I'll make a flight video later today. |
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Here's the video!
This was the second flight, the plane will need a little more adjustments and trimming. Overall I'm really happy with it already, I even managed to fly it in the bedroom
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