Latest Uas Project

[Myron]

Hey guys,

We at RPFS primarily focus our efforts on the smaller flying wing format, but here lately we have had alot of interest in a large "Gasser" twin boom unit. Some of you have seen this same fuse design in a smaller E-power unit we did a while back. The plan was to have a 70" E fuse that could easily be changed to a larger 86" wing for better payload carrying capabilities. The end result flew great in E trim with a smaller wing, but the much larger wing really needed more power and HD gear.. So here we are with a vacu-formed ABS fuse, 86" wing, a G26 for power and some HD landing gear.. This one is perfect for a rough "runway".. As you can see by the pics, the payload bay is pretty substantial, NO, were not gonna fly it with the propane tanks! I just stuck it in there for size reference. All she lacks before a maiden under RC control is a couple servos and the fuel tank installed.. As it sits right now, it weighs 15 lbs.. Were figuring 22lbs with fuel and payload.

Myron

[willhaney]

Very nice. Like the nose art. ;)

Will

[DiveBombDave]

Awesome work Myron! Good to see a nice twin boomer come out of the shop.

Dave

[Myron]

Hey guys,

Thanks for the props on this bird.. Gene is in Cali right this second with the makers of the autopilot and hopefully he will be bringing one home with him on Wednesday. the AP system is more designed for a MAV so he is talking to them about what all were gonna need to do to run up to 10 servos in this aircraft. The autopilot can handle 4 basic flight channels and 3 other functions for payload or camera control. It also obviously has all the telemetry data built in. I'm getting ready to mount the throttle servo today so we can get the motor dialed in.. First flights with it will be with my Futaba 12Z radio and an Eagletree telemetry System and GPS.. We will then ballast her up to see what she will carry and for how long... We dont do alot with the gassers so maybe someone else can chime in on their motor,tank size, prop and run time? I know that 32oz of gas goes a long way in a plane with a big wing running at around 1/2 -2/3 throttle...

Myron

[Myron]

UPDATE..

Hey Guys,

Well, we finally got a decent weather day to try this thing out. Everthing went as planned and it was a non eventfull day.. Assembled the bird, put about 2lbs of payload in addition to the 24 oz of fuel and off we went... It only needed a few clicks of up trim and that was it.. First flight was basically just a short hop of about 5 minutes.. We brought it down and stuck and eagletree data logger and GPS in it to see what some of the initial #'s looked like.. Straight and level top speed was 66.98 Mph and cruise was just a hair under 40Mph at about 1/3 throttle.. We have the motor just a tad rich for the initial flights so the top end may come up just a bit. Sometime during the week were gonna ballast her up to 5 lbs and see how she flies.. We were initially concerned with the power output of the G26 and weight of the bird, but all is well!

Myron

[levelution]

With the payload bay so far forward of the CG how do you balance it?

[Myron]

Levelution,

Without any balast in it it would be too tail heavy to fly. So basicaly you have a huge area for payload that acts as the ballast to get the CG right.. You can stuff 1.5 to 2 lbs in front of the nose gear and it will be fine.. If you spread it our from the front of the wing forward you can bring that # way up..

Myron

Myron