|Feb 23, 2014, 02:02 PM|
HK F-18 retracts?
Must be all the snow, cold weather, or just being cooped up during this long A$$ed winter, but the mind starts to wonder!
Not that I need another build, but Ron101's F-18 got me thinking--
JePe has a nice F-18 -- http://www.jepejets.com/jepeshop/f-1...70mm-fans.html
A decent size too! Length:--- 167cm (nose to elevator ends) 65.74"
Wingspan: --113cm (inlusive sidewinder fairings) 44.48"
And these would be a nice touch--
Turnigy Full Metal F-18 Style Large Scale Servoless Retract with Oleo Legs
Has any one used these, and what did you think about them?
|Feb 23, 2014, 02:29 PM|
I got a set when they first came out. I haven't installed them in anything but I do have a Hayoe/Jepe F/A-18 that did some time ago with a single 90mm.
They look good but kinda heavy.
|Feb 23, 2014, 04:04 PM|
As for weight , he has the kit listed as 600 gram/21.16 oz
I was doing a little number crunching, and for basics came up with this:
Now a JF90/Het 700-68 motor is around 17 oz.,Gear-14.8oz, entire fuse weight-- 600g/21.16 oz, 2 x 5000 mAh 4s batts = 37 oz ( keep the weight low!) and 5 Hitec HS-85mg servos--.8 oz ea/5 = 4.oz, So thus far you have approx 94 oz/ 5.87 lb. There suggested AUW is 7.7 lb.
Now to add this in-- I would glass the fuse-- nothing to heavy, there will need to be some additional formers for retracts, fan mount., etc-- but I think it could be keep to an acceptable weight. Still have 2 lbs to "use up"
That said, WS = 44.5" , so it figures out to be 495sqin/ 3.437 sqft.
Depending on final weight, 8 lbs is 37.24 oz sqft. , 9 lbs = 41.897 oz sqft. , god for bid 10 lbs, still only 46.55 oz sqft. A lot yes, but the wing loading for a JTM L-39 is alot higher ... 411.95sq.in/ 2.86 sqft.
At 11 Lb--WL is 61.5oz sq/ft. Now on the other hand , hofers Starfire at 18LB is 65.5oz sq/ft.
I just for the nuts of it figured out what Ron101's WL is for his F-18 twin, 71+ oz sqft.
The real F-18 is not a floater, and I wouldn't expect a EDF model to be that either. But under 40 oz sqft is doing OK.. They just don't have real large wings..but some lift is provided by the fuse and strakes.
The WL on the real McCoy is 93 lb/ft² (454 kg/m²)
|Feb 23, 2014, 05:15 PM|
Cooler, I was talking about the retracts. I have the model already and I was flying mine at a little over 6 lbs....it was truly a floater. The WL numbers doesn't take into account the LEX. A 36oz/ft Hornet is a LOT more forgiving than a 36oz/ft P-51
Back to the retracts....with the ugly wheels the set weighs 14.75oz. They are made by RCLanders, at least that's what is stamped on it.
|Feb 23, 2014, 06:05 PM|
Kevin, thanks for taking the time -- I looked up your thread--- EJF Big F(foamy)/A-18
Nice video--but small!
And yes you are correct--" ....with the ugly wheels the set weighs 14.75oz. " I would assume they could be swapped out for more scale looking ones.
Right now, retracts are not the priority, procuring/finding a kit is. I can get one from Jepe, but I do know a few who my have one.
The rest can be worked out at a later time.
And thanks again.
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