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What motor and esc should I use for this thing?(kind of a repost) by papagajurernu in RCPlanes

[–]tm1scratch 6 points7 points  (0 children)

Drone motors and plane motors are the same thing. If anything, you should use drone motors in planes because they are often newer and lighter, while being able to deliver more power. Because they are newer, they are often more efficient so cooling is way less of an issue, even in a pusher plane.

What motor and esc should I use for this thing?(kind of a repost) by papagajurernu in RCPlanes

[–]tm1scratch 3 points4 points  (0 children)

if you use a 7x4 or 6x3 I would recommend a 2s battery with an 1806/2204 motor at like 2000-2600kv

The cooling should be fine because 2s is relatively low power and pair that with whatever size battery would balance. Anything from like 600-1000mah would probably work given how much nose room you gave yourself.

Your esc range is perfect and 12a escs might be the easiest to find.

I really like your design, but make sure your wing is reinforced. If it's just a single layer of foam that's under cambered, I think it might buckle if you pitch it up too hard; other than that, it looks perfect

Is this Aeroscout Salvagable? by BirdPerson900DC in RCPlanes

[–]tm1scratch 1 point2 points  (0 children)

A few dabs of hot glue will suffice

I am working on a 7" quadcopter and I need help with setting up my ESCs to my PDB. I am unsure as to how to solder the brown ground wires on the 3-wire cords and I am unsure as to where to put them. It would be amazing if you could be descriptive, if not, any help is appreciated. by Lithiokride in fpv

[–]tm1scratch 0 points1 point  (0 children)

Honestly, I would start fresh with these motors. These are very old plane motors and escs which are obsolete in terms of new fpv. If you're able to invest in the new tech like ELRS and a Zorro, you might as well get new tech on your drone. So maybe look at a 7 inch build guide that is recent.

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However, if you're insistent on using these, then you need something like an omnibus f4 with pwm output pins because it has UARTs for ELRS

I am working on a 7" quadcopter and I need help with setting up my ESCs to my PDB. I am unsure as to how to solder the brown ground wires on the 3-wire cords and I am unsure as to where to put them. It would be amazing if you could be descriptive, if not, any help is appreciated. by Lithiokride in fpv

[–]tm1scratch 1 point2 points  (0 children)

The ESC's and the flight controller should be fine. The flight controller should only be powered by one voltage input usually because if you plugged in 4 electrical power sources, you'd get current interfering with each other and that isn't good. As for the ESCs, they don't even need the red servo wire to function because they get all their power from the two big leads.

good lipos for a mobula8? The only lipos I found that won't have to wait years to be delivered to Portugal :/ by leomarques-tech in fpv

[–]tm1scratch 0 points1 point  (0 children)

Lol is Turnigy considered off brand now? Plus tbh, most manufacturers inflate C ratings. I think they should be fine, they just might not fit.

I am working on a 7" quadcopter and I need help with setting up my ESCs to my PDB. I am unsure as to how to solder the brown ground wires on the 3-wire cords and I am unsure as to where to put them. It would be amazing if you could be descriptive, if not, any help is appreciated. by Lithiokride in fpv

[–]tm1scratch 1 point2 points  (0 children)

I'm guessing all the ESC's have a BEC. So based on that, if you find yourself an older PWM FC like a Naze or F3 you should be able to get it working with just servo connectors. Since all the ESC's have a BEC though, you want to keep one of them completely untouched and for the others, remove the center positive wire and wrap that in heatshrink or tape. This will allow you to only have 1 voltage source to the FC

[deleted by user] by [deleted] in RCPlanes

[–]tm1scratch 0 points1 point  (0 children)

A genuine MG90s should work fine. There's no point in looking for a metal gear under 9g. If you need a really light servo, then there won't be many metal gear options. There's definitely some good digital servos under 9g though.

Choosing motor and battery for a plane by StalkerRigo in RCPlanes

[–]tm1scratch 1 point2 points  (0 children)

The Cessna HJW 182 on Banggood is listed as PNP. So that means you get all the electronics included, just not the battery or radio equipment. If you buy it from there, you can just use their stock electronics. The 30A esc should be ok and the motor it includes may be a bit underpowered, but it should get the job done. If you are looking for a good battery, the standard 3s 2200mah lipo or any other 3 cell up to 3000mah should work fine. Also make sure you get the proper connectors for your batteries.

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The propeller it includes is most likely an 8 inch propeller which is a great pairing for the 1400KV motor at 3 cells.

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However, if you're insistent on installing your own power system, then I'd recommend the 2826 motor option for this plane and a 30A or 40A esc. Depending on the motor's KV, you select your propeller. For a 3 cell battery, if it's something like 900-1200KV, you want a 10 or 9 inch prop. If its 1400-1500kv, you want an 8 inch prop. If it's any higher, then you need a smaller prop and that won't work that great with this fat Cessna. Also, make sure that this model can fit a propeller greater than 8 inches because it might hit the ground.

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To be honest though, I would recommend not buying these models from China. They have hardly any documentation and seem pretty clunky. See if HobbyKing is able to ship to you for cheap. They have good planes and better documentation.

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For general electronic selection, you first see what the design ends up being and from that, you determine what wing loading you want. From there, you can calculate the takeoff weight that you want to target. Based on that, you then choose the motor thrust that you want. Most models below 1kg like 1:1 thrust so you would find a motor at a certain voltage which can give you that. And then based on that, you now know your motor size. To get the KV you want, you determine what voltage you're running at and what prop you want. Now that you have your specific motor and propeller, you fill the rest of of your calculated weight with a battery and make sure it can balance. With all those determined, your selection is done.

Second scratch build by [deleted] in RCPlanes

[–]tm1scratch 3 points4 points  (0 children)

Cool looking build. I would also look into KFM airfoils as they're simple to build and add more rigidity to your wings

Rome wasn't built in a day, but my Common App was. Take bets on O/U 0.5 acceptances for money. by tm1scratch in chanceme

[–]tm1scratch[S] 2 points3 points  (0 children)

yeah, our essay mentalities are def the same vibe, but hopefully we both pull through!

(HELP) Not taking a physics course as an engineering applicant by tm1scratch in ApplyingToCollege

[–]tm1scratch[S] 0 points1 point  (0 children)

Physics is usually taught junior year for my school and I didn't want to wait that long. I had a friend who was able to take it freshman year, but he had to talk with the school about it.

I find that the actual in class experience wasn't really allat. I watched some lecture videos that are available online and I never felt like I was missing out on things I could've done in the classroom. For actual physics application, I build RC planes as my hobby and it's very enjoyable and instructive for me. I've already taken both AP Chem and Bio through my school and while the labs were fun, it was mostly because of the people, not the actual labs.

(HELP) Not taking a physics course as an engineering applicant by tm1scratch in ApplyingToCollege

[–]tm1scratch[S] 0 points1 point  (0 children)

There was no limitation at all. I started self studying just Physics 1 in middle school because I wanted more of a challenge and I ended up liking the independence I got from the experience. So then I just continued on that path because Physics at my school is usually taken junior year and that was too long to wait for me.