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Feb 20, 2020, 05:38 PM
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Project Bee ( 490mm Wing )


Project B

This is a flying wing that comes in a twin pack ( 2 wings ) , I got mine from banggood .

I really like twin packs .

Building the wing gives me what appears to be a strong and stiff platform that will stand up to some bumping and grinding . The Bee is suggested to be for FPV , but with everything hanging out in the breeze so to speak I was quite happy to build mine for line of sight flying .


The Motor

Quite simply a offering from my defunct x450 . Motor and prop are x450 left overs . When I did some motor testing the x450 motor prop combo pulled some 2.18A for some 121g of thrust @ 12,000 rpm . I did some more testing and

6x3 Gemfan 2s = 2.8A / 156g / 22.5w / 10,500rpm
5x3 Gemfan 2s = 2.44A / 133g / 20w / 11,700rpm
6x4.5 2s = 4.4A / 180g / 36w / 8100rpm = Too much prop
5x3x3 2s = 2.6A / 142g / 21w / 11,500rpm
x450 prop 2s = 2.18A / 121g / 18w / 12,000rpm

I will have to check the current to the motor in the model as it is a different motor to whats on the test stand . ( Back up current draw )

ESC

Quite simply the cheapest 10A Ebay ESC I could buy . The motor wires are soldered directly to the ESC and I was lucky that the motor ran in the correct direction the very first time .

Servos

Some small Turnigy I had lying around . The first servos I used were some Ebay ones ( 3.7 or 4.3g ) and unfortunately one of the servos was dead as a do-do bird . So I was forced to replace them with the Turnigy . Nothing was glued in yet so replacing them was easy .

Battery

Hmmm , I wanted to use the 300mAh ones from the OMPHobby T720 , but the x450 motor was too heavy . So I ended up with the 500mAh one from the Volantex Decat .

Flying weight

Flying weight is almost on the nose for 108 grams , which for me is a little porky pig for a 490mm wing . Though no where near as bad as if I had built it as suggested by the factory .

The C of G

As near as I can tell , factory recommendation is about 110mm from the nose . Currently my CG is around the servo leads . ( Maybe too hot ? )


I have not glud tested or flown the Bee yet as it has been raining last night and the ground is sloppy wet ! No wind to speak off , but all that water on the ground ? The battery is charged , the Rx bound and the Tx set up .. Hopefully ASAP
Last edited by old4570; Feb 20, 2020 at 09:06 PM.
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Feb 22, 2020, 05:09 AM
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CG Games ...

The 500mAh 2s battery brought the CG to 120mm from the nose ...
This was literally impossible .

I have a 900mAh battery that will bring CG to 110mm ( Factory Recommendation ) , but I think this too will ( might ) be too far back . Then there is the 1000mAh Nanotech that will bring CG to about 100mm from the nose ..

Next time out ( probably tomorrow morning ) I will take the 900mAh and 1000mAh batteries with me .

CG without a battery is around 150mm from the nose , I would suggest this is way too far back if you want to run a smaller , lighter , battery .
Without a test bunny , who knew ?


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