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Old Oct 04, 2012, 03:58 AM
kin
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Some update in website http://www.smartmodel.com.hk/product...3&third_id=325
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Old Oct 04, 2012, 06:16 AM
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Nice
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Old Oct 06, 2012, 02:38 AM
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Originally Posted by Pelle57 View Post
Hi!! Can you show a picture of the status of the plug of 800-size UH-1D compared to the picture in # 3406 ??
I think we are many in here who are interested to know and see.

Thanks...
The basic plug is complete, i have started covering it with aluminum panels so it has a real wrinkled look to it like the real one. Here is a teaser shot of the horizontal stab nearly completed.
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Old Oct 06, 2012, 05:15 AM
kin
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Keep to work like this nice !!!!!!!!you are super !
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Old Oct 06, 2012, 08:08 AM
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Super!!!!

That's looks really, really nice!!!!!!
Yes....it's a REAL teaser!
I will be lucky that day I can put my fingers on one of those.....can't wait!
Keep up the good work and thanks a lot for the picture....then we know the project are still running
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Old Oct 06, 2012, 09:56 AM
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Low headspeed 800-size

Hi!
When these birdies start to reach 800-size and bigger and some models are suitable with lower headspeed (UH1 for example), are there any solutions to keep a good tail rotor speed???? What I can read here in forum are 1100 rpm suitable to use if you not want to loose tail power.
Is it possible to change the gear ratio to tail in some way??
On the tail drive set it's two places with gears, does it exist some option gear to change???
Or are there any other solutions to clear the problem on a Trex 600 mechanic??
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Old Oct 06, 2012, 11:59 AM
Complete RC Idiot Savant
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Originally Posted by Pelle57 View Post
Hi!
When these birdies start to reach 800-size and bigger and some models are suitable with lower headspeed (UH1 for example), are there any solutions to keep a good tail rotor speed???? What I can read here in forum are 1100 rpm suitable to use if you not want to loose tail power.
Is it possible to change the gear ratio to tail in some way??
On the tail drive set it's two places with gears, does it exist some option gear to change???
Or are there any other solutions to clear the problem on a Trex 600 mechanic??
Don't worry too much about it: chances are (backed by my experience) that if you can lower the headspeed sheer due to increased helicopter size, very likely the tail speed does not need to be that high too (tail rotor size is increasing too, remember?)

Brgds, Bert
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Old Oct 06, 2012, 04:05 PM
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Originally Posted by Brutus1967 View Post
Don't worry too much about it: chances are (backed by my experience) that if you can lower the headspeed sheer due to increased helicopter size, very likely the tail speed does not need to be that high too (tail rotor size is increasing too, remember?)

Brgds, Bert
Not necessarily true in my experience... As the torque increases with longer, heavier, and more main blades, so the demands on the tail go up as well. My 60 size Jet Ranger is 12.5lbs running TRex 600 mechs at 1450, with 650 OF main blades and 105 tail blades. I have experienced LTE in moderate winds (8-10mph) when the T/R is pushing downwind. Nothing like an uncommanded 90 degree rotation to get your attention...

You can only increase the size of the T/R blades to a certain point... Speeding up the T/R is a much better way to counteract the increased anti-torque demands of a larger scale ship. Driving the tail off a second motor seems to me to be an excellent way of handling things, but has drawbacks with weight and complexity. A 'speed up' gear option would be the best method, but currently doesn't exist.
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Old Oct 06, 2012, 04:38 PM
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I agree with Rodan on this subject , as my 60 size Long Ranger with T-600 mechs runs a HS of 1050 and 95mm tail blades but is runnig a higher tail rotor ratio.

I used this Thunder Tiger Titan SE Raptor 50 8t pulley on the tail rotor output shaft to greatly increase the tail rotor speed.
http://www3.towerhobbies.com/cgi-bin...?&I=LXAHBR&P=0
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Old Oct 06, 2012, 06:54 PM
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I have experienced LTE in moderate winds (8-10mph) when the T/R is pushing downwind. Nothing like an uncommanded 90 degree rotation to get your attention...
Just switch off your headlock...
Your problem is not in tail authority, but in the headlock robbing you of the feedback that would otherwise have warned you way in advance, that you are about to overload your tailrotor. Once overloaded, the controlling action of the headlock makes sure it stays overloaded until airflow over the tailfin takes over. Hence the 90 degree turn or more, usually until the nose is in the wind again.
I have seen this numerous times.

I fly a 3 bladed .60 size trainer, running at 1350 RPM (manufacturer recommended max is 1500) and that thing is weighed down to not 12 lbs, but approx 18 (Yes.... Eighteen pounds) and that still does not have any tail problems, with stock tail blades and stock gear ratios

Don't take my word for it: Just get into rate mode, try it yourself and be amazed how much more your tail seems to be able to handle safely (but of course, don't overdo it).

Brgds, Bert
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Old Oct 07, 2012, 12:34 AM
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800 size headspeed

I am going to start to build a UH-1D, when it will be released, and have planned to use a 480kv motor on 8s which should give HS around 1000 and lower.
Have anyone tried HS 1000 or under that on 800-size scale bird? Want to try the setup on 8s (2x4s) because of the weight also.
Have seen some examples on youtube where they fly 700-size on HS around 700-900 and they fly great.....but of course, they are ordinary helis, not heavy scale machine.
Kin says he fly the UH-1 with HS 1100 and my question is.......do anyone know if it's possible to go under 1000 on 800-size with a 2-rotorblade machine??
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Old Oct 07, 2012, 01:57 AM
kin
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Yes ! i think the HS below 1000 is not easy in market mechanic .first need to let the tail gear speed ratio success higher at least 15-20 % . at the same time tail blades length longer about 20mm but hope not out of scale look and no hit the main blades . In the torque tube system i have a new version HGR (Hight gear ratio) .The output gear have 5 teeth more (25 teeth ) , my now version output gear is 20 teeth , so 25% more different higher . now have doing the second version .SM-HGR tail drive system !!!!! It is 1:1.25 Ratio higher
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Old Oct 07, 2012, 02:17 AM
kin
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Ok new ! SM -HGR (1:1.25 fast version) torque tube raise tail system coming soon .It will come out in middle Oct . Ha Ha ! Just a little bit different cost let me buy new gear ..188 usd only
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Last edited by kin; Oct 07, 2012 at 02:23 AM.
Old Oct 07, 2012, 02:21 AM
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Hgr

That looks really good Kin!!!
Hope that project will develope and sucsess in the right way.
Look forward to hear report from you and see testflight!
Keep up the good work Kin
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Old Oct 07, 2012, 02:24 AM
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Originally Posted by kin View Post
Ok new ! SM -HGR (1:1.25 fast version) torque tube raise tail system coming soon .It will come out in middle Oct . Ha Ha ! Just a little bit different cost let me buy new gear ..188 usd only
So that means when the customers buy the scale kit from you they can choose if they want a STANDARD or a HGR version for the tail....right??

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