Tjhochha
Active member
I may be getting super ambitious here, but I would really like to build a foamie P-2V Neptune plane. They were a staple in the sky through last year because Neptune Aviation is based out of Missoula, where I live. The real plane is the slowest flying plane I've ever seen, when they were out doing test flights, they just crawled along.
I did find some old balsa control line plans for the plane, I am going to see what I can do to use those as a reference to design a foam version. I'm having a tough time deciding on scale though. The wingspan is 100', I would like to do 12th scale but that is a massive plane. I think I will end up going about the size of the Guinea pig.
Alright Guys, I ended up scaling the plane to match the prop size to a 10" prop. See final specs below. I attached V1.0 of my P-2V Plans here. It flies very well on a twin C-Power pack. 50% throttle runs nice and level, it even has a nice glide slope.
Specs:
AUW W/ 2)1300mAh batteries: 2.23 lb/1015g
Wingspan: 57"
Length: 52"
CG: 2.6-2.9" Behind Leading Edge. Flown at 2.3"
Wing Area: 358 sqin
Tail Area: 77 sqin
Wing Loading (2D): 14 OZ/sqft
Wing Cubic Loading: 9.11
The plans currently don't have a bottom center section of the fuselage below the wing. I will update them once I come up with a plan for a set of bomb bay doors. I had concerns about getting the CG far enough forward and I planned on putting the batteries in front of the wing, but it turns out, the weight of the motors was enough to achieve the correct CG. I had to install the batteries at the back of the nacelles closer to the CG to not be too nose heavy.
I did find some old balsa control line plans for the plane, I am going to see what I can do to use those as a reference to design a foam version. I'm having a tough time deciding on scale though. The wingspan is 100', I would like to do 12th scale but that is a massive plane. I think I will end up going about the size of the Guinea pig.
Alright Guys, I ended up scaling the plane to match the prop size to a 10" prop. See final specs below. I attached V1.0 of my P-2V Plans here. It flies very well on a twin C-Power pack. 50% throttle runs nice and level, it even has a nice glide slope.
Specs:
AUW W/ 2)1300mAh batteries: 2.23 lb/1015g
Wingspan: 57"
Length: 52"
CG: 2.6-2.9" Behind Leading Edge. Flown at 2.3"
Wing Area: 358 sqin
Tail Area: 77 sqin
Wing Loading (2D): 14 OZ/sqft
Wing Cubic Loading: 9.11
The plans currently don't have a bottom center section of the fuselage below the wing. I will update them once I come up with a plan for a set of bomb bay doors. I had concerns about getting the CG far enough forward and I planned on putting the batteries in front of the wing, but it turns out, the weight of the motors was enough to achieve the correct CG. I had to install the batteries at the back of the nacelles closer to the CG to not be too nose heavy.
Attachments
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