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Old Jun 25, 2012, 07:57 PM
Extreme CNC Alloy EDF
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Australia
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Yup definitely oversize the wing! JTM made their Hawk scale, and at 4-4.5kg its a pig, a heavy lander that destroys undercarriage on grass. If they had added 75-100mm either side of the wing it would be a very different beast and would still look great.
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Old Jun 25, 2012, 08:20 PM
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Atlanta, GA
Joined Mar 2009
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I'd have to agree with Extreme_RC. Except for the total scale enthusiast a slightly larger wing makes a huge difference on landings. I wouldn't go as far as calling the JTM a pig. It flies great at speed but she can be a handful to land because of the wing loading of the scale wing.
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Old Jun 26, 2012, 04:50 AM
kin
Composite factory
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Originally Posted by erh7771 View Post
What will lengths of planes be?

Also, do you have any plans for F18 super hornet or F14 Tomcat

These are the most favorite jets of all human kind on Earth

P.S. Earth being Nor Texas
i thinking after some month will have a twins 100 F-14 . let see now busy in hand project .
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Old Jun 26, 2012, 05:15 AM
kin
Composite factory
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The wing have 3-4 washout now and the fuselage is 1530mm and now the winf is 1230 mm (in scale ) but i want add each side 60mm . it look still very scale . if i don't tell you , you can not feel the different . if the Balsa wood wing version fly well . try to move the data to composite wing . so i want it fly nice performance . the flap hing are scale , let the flap moving scale . it is easy for me . retract gear is electric retract . cnc scale struts .gear door . base cockpit panel .factory install former and ducting tube (2 in 1) . Y style .
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Old Jun 26, 2012, 05:45 AM
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Brisbane, Australia
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Looking forward to seeing the pictures!

Thanks

dave
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Old Jun 26, 2012, 06:46 AM
kin
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after the plug complete , i post here !
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Old Jun 26, 2012, 08:25 AM
Some Girls r Bigger thn Others
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USA, UT, Cedar Hills
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I think 60mm will not be noticeable and the extra will certainly help with slowing down landings, but the most important thing here is the washout on the tips. Need those built in to help avoid tip stalls. I've seen a few Hawk/T-45s go in because of that (only one of mine).
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Old Jun 26, 2012, 09:42 AM
4.2V of pure Kraut power
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Germany
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Quote:
Originally Posted by kin View Post
, i saw a lot other producys is extra add some wing span , but if we make the weight more less , i think it can keep preformance is scale wing size ! Any recommendation for us ?
Use scale size if possible and only add slightly, just whats needed to get good performance. I really hate those oversized flying wings that have nothing in common with the sleek lines of the original (e.g. HK L-59).

Its possible to get very stable platforms using modern profiles and wash while maintaining almost scale wing geometry. See e.g. the Grumania SU-27 or HET L-39.

- Frank
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Old Jun 27, 2012, 07:11 AM
kin
Composite factory
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I think the airfoil is one of the factor effect the preformance . the airfoil is one of the eppler . so if the extra wing span 60mm is not much but i want keep a little in scale good looking . so is it add 80mm is one of the decision ? the fuselage plug basely done .intake area is a little bigger than the fan area , so in the passed experience , it is ok . before we are use the very crab china free wing 90mm fan . now if i use Change Sun or other better fan ., i think the flying weight should be in 5kg , i think is very happy even not a rocket , but it should be very happy !
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Old Jul 04, 2012, 08:40 AM
kin
Composite factory
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Planning next models is F-20 about 1.7-1.8m for 90/100mm and mini turbine . start the drawing and i think it is for full composite version . Or maybe one more is base econ version , but this F-20 will be let the full composite out market first . The System hawk master plug are doing now . it come out very soon , i think this month will complete ! I will use a Chanhe Sun fan for test .
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Old Jul 04, 2012, 09:24 AM
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United States, TX, Grand Prairie
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Quote:
Originally Posted by kin View Post
Planning next models is F-20 about 1.7-1.8m for 90/100mm and mini turbine . start the drawing and i think it is for full composite version . Or maybe one more is base econ version , but this F-20 will be let the full composite out market first . The System hawk master plug are doing now . it come out very soon , i think this month will complete ! I will use a Chanhe Sun fan for test .
Sounds like you're really busy

When are these models going to be posted on your website?

Also on the changesun fan if you're goin to use the 120mm score the base of the blades and use Gorilla Glue or any glue that expands when dries on both sides of the blade base.

The only thing holding the blades in place are the tabs at the bottom, once you add strength to the side of the blades they fan can take more power
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Old Jul 04, 2012, 02:02 PM
kin
Composite factory
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Today shopping a plastic model . and it will be a coming future models . i like it very much , it have a big wing span ,when it full open the wing . and i have to know how let it balance when the wing full backward .it is also twins 100 mm fan
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Old Jul 04, 2012, 02:06 PM
kin
Composite factory
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Originally Posted by erh7771 View Post
Sounds like you're really busy

When are these models going to be posted on your website?

Also on the changesun fan if you're goin to use the 120mm score the base of the blades and use Gorilla Glue or any glue that expands when dries on both sides of the blade base.

The only thing holding the blades in place are the tabs at the bottom, once you add strength to the side of the blades they fan can take more power
ok i see ! thankyou for thr remind !
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Old Jul 04, 2012, 02:11 PM
kin
Composite factory
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The tail rubber is completed the mold , and now are making the surfaceing work in the fuselage , will post the detail surface pic tomorrow .All the parts make with germany epoxy resin and gel coat . So keep the quality possible same level from germany .and all the hollow mold wing from me is Rohacell only ! no more balsa !
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Old Jul 04, 2012, 02:59 PM
4.2V of pure Kraut power
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Germany
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Originally Posted by kin View Post
I think the airfoil is one of the factor effect the preformance . the airfoil is one of the eppler .
Why using an Eppler airfoil? Granted a E205 can do high speeds, but can be a quite problematic at lower speeds. See e.g.

http://translate.google.de/translate...205_sd7037.htm

A modern airfoil will do better, e.g. MH43, RG15. Especially the MH42/43 is very forgiving and provides a rather soft stall characteristic while providing low drag/high top speed.

- Frank
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