Mr Man
Elite member
Yep, it’s supposed to be 5v, that’s how much your esc sends out the receiver plug.
Help! FT Racer not flying
- Thread starter Hex23
- Start date
Sorry for the long reply. Here are the pics. It got damaged when i was test flying it so i had to fix it a little bit. I removed the exhaust this time. This is where i put my battery and i based the cg according to the plans. Im planning to move the battery a little more to the back then try to fly it. The plane has dmg under the nose (crashed at a guava tree). It sustained little damage. I think i can still run some tests on it and try to figure why it wont fly.
Attachments
I see. The racer might be the same?
btw. This is the vid of me balancing the plane. I use the reference mark of the cg on the plans
Okay. Thanks. I will look for it on the internet👍
Foamforce
Elite member
I’m leaning toward under powered at the moment. A 2212 1400kv has substantially less thrust than a 2217 1200kv. I would still expect it to be able to fly though. You should still be able to get 750g of thrust from that motor, and a plane with 1:1 should be able to fly.
Can you do a crude thrust test? Place the tail on a digital kitchen scale and balance it with your other hand. Zero the scale. CAREFULLY balance it upright with your hands in front of the wing or tail so that it doesn’t get away from you. Keep your body parts well clear of the prop arc and wear safety glasses. Have a helper give it full throttle. See what the scale reads, which will be your thrust (well, it will be negative, but ignore that).
I would expect to see ~650-740g. If it’s much less than that, then you have a thrust issue.
Speaking of which, are you sure your prop is on the right way? Numbers go forward.
Can you do a crude thrust test? Place the tail on a digital kitchen scale and balance it with your other hand. Zero the scale. CAREFULLY balance it upright with your hands in front of the wing or tail so that it doesn’t get away from you. Keep your body parts well clear of the prop arc and wear safety glasses. Have a helper give it full throttle. See what the scale reads, which will be your thrust (well, it will be negative, but ignore that).
I would expect to see ~650-740g. If it’s much less than that, then you have a thrust issue.
Speaking of which, are you sure your prop is on the right way? Numbers go forward.
Tench745
Master member
Based on your numbers and a similar plane I built with a similar setup, I would think this plane should fly.
I ran the numbers through eCalc, and it says that motor/battery/prop combo (either 8060 or 9045) should fly fine.
It sounds like you've covered all the most common issues except ESC calibration.
If I had to put money on it, I'd say that's going to be your issue. If it's not we'll chase some more possibilities with you.
I ran the numbers through eCalc, and it says that motor/battery/prop combo (either 8060 or 9045) should fly fine.
It sounds like you've covered all the most common issues except ESC calibration.
If I had to put money on it, I'd say that's going to be your issue. If it's not we'll chase some more possibilities with you.
Hello. Thanks for the info. I havent try to thrust test it yet. Im off to some work related stuff.
Regarding the motor size. I found out that racer required power pack C, and i have B right now😅
I ordered 2217 1500kv online. Should arrived in 2 weeks (my last spending on the hobby for this year.. i hope)
Now i have 2pcs of 2212 motor. Prob go for simple cub.
Thanks again. I havent tried esc calib and thrust test yet. I will do it when i get back from work. Thats good news, I have 8060 and 9045 prop.
Before i bought my electronics. I did some research on which i should get. Turns out i missed an important info regarding motor size. I thought only the kv matters😅 a lesson for me.
On the bright side. I can still use this for other ft planes that run on power pack b.
Thanks for the big help👍🫡
Mr Man
Elite member
The ft simple scout and simple starch are some good ones.
Piotrsko
Master member
Get your hands on a fish weight scale or equivalent for checking thrust, everything else is going to be hazardous. I have ten ft of oak trim with a prop strike marked every 2inches. OR you get a helper to run throttle to full on while you hold it two handed pointing nose up to see if it gets very light. Don't look like enough wing for my taste, expect it needs to be going pretty durned fast. I suspect your test glides weren't fast enough, full up should have commanded a noticable stall bobble and thereafter nose planting.
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