Sterling101
On my last HobbyKing order (new retracts for the Hawk rebuild) I dropped one of these in the cart to get me up to free shipping...

https://hobbyking.com/en_us/jet-8-kit-color-a.html

It's basically a rip off of the Prime Jet 8, which in turn was based on the Multiplex Funjet from what I can gather. I figured that for little more than £10 I could have a bit of fun with it.

The foam is quite dense and not like any other stuff I've ever used. It's almost got a rubbery texture to it but it seems pretty strong for it all the same. The kit came with pretty much everything to build the airframe up including carbon for the main wing (2 pieces), some for the canards and a strip each for the stabilisers.

So, about an hour, a couple of servos and receiver later I had it built..

IMG_20180331_123541_228.jpg 

Now the specs say a 6x4 prop, 2200kv motor which should give a 1.6:1 thrust to weight ratio. Seems pretty good I thought, so I stuck a quad racing motor I've had lying around on (http://rctimer.com/product-1734.html). Only 2780kv so put a suitable prop on it too - a 5x4.5x3 bull nose.
I've opted to use a 1000mah 65C 3S Graphene battery and it balanced lovely on the non-existent CG marks - thankfully the Prime Jet 8 plans are readily available so took the CG from that.

I also thought that the wings were a bit "flappy" at the tips so I stuck some 5mm HobbyKing foam panels underneath the wing panels from the stabilisers up to the edges which has stiffened it up nicely. Hopefully should reduce the chance of wing flutter at high speeds.

Now, onto the fun part. The AUW is 385g so a nice light bird and should, with it's shape, cut through the air nicely.
The thrust from the motor and prop combo is just shy of 1040g on a fresh battery (previously tested) so I think it could be a bit of a fun one to drive nose first into the ground... Erm I mean fly with feeling, enjoying the fast passes

Certainly at just over a third throttle it wants to go skywards quite rapidly doing a static thrust test. Let the comedy commence once the weather allows...
Whoever said nothing is impossible had obviously never tried slamming a revolving door...
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Sterling101
Managed to get in a maiden this morning before it started raining!

Launched at quarter throttle and sent it up high to trim and dial in the throws then set to having a bit of fun with it
Flies great on the 3S 1000 65C Graphene battery I loaded up but will see what the real fun's like when the new 4S 1300 turns up for it - then I can open the taps properly and get the motor up to it's peak watts



Most probably going to shape the wings a little too as they're all just square edges at the minute so if I can make it super slippery it should perform even better!
Whoever said nothing is impossible had obviously never tried slamming a revolving door...
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andy_downs
looks slippery enough for me already,nice looking model.
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Sterling101
Quote:
looks slippery enough for me already,nice looking model.

More speed will help it out definitely

On the 4S set up I want to smooth it out as if I get too much disturbance under the wings I could end up with some pretty bad wing flex/flutter as the speeds go up.
Won't take much to do - little bit of sanding here and there and I might even go mad and pop some wing fences on to help with the tip vortexes which can add to the flutter at speed too...
Whoever said nothing is impossible had obviously never tried slamming a revolving door...
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