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Century Helicopter . MTA Hobbies . Model Rectifier Corp

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Align T-REX 600N 700N > t-rex 600 n sport fitted with ys 91 st 4
 
 
ady
Senior Heliman
Location: norfolk england

hello there , the mount is 61mm wide , once i`d slid the engine in place i redrilled two new 4mm holes in the sideframes and drilled and retapped the mount , nothing else on the heli , ie shoud etc has been touched , only the baseplate had be slightly trimmed for a better fit , so to convert back to a fifty , i can drop out the ys and put in the os 50 , not i`m going to tho
12-29-2007 07:16 PM
 
 
allenl
Senior Heliman
Location: Petaluma, CA

Thanks Ady. I have an OS 70 that I tried to sell about a year ago. It sounds like for the price of a TT mount I can give the 70 a try. If I like it all of the work is done to move up to a YS 90.

allen
12-29-2007 07:58 PM
 
 
MoneyPitVictim
Veteran
Location: Dayton, Ohio

Quote 
I am sure the ys .61 would be ideal but if we can fit a larger motor with the same mounts.......why not??

Well, I guess depends on what you are after. Raw power, the bigger engine will give you the most torque and HP, but not necessarily the high RMP. I find it hard to believe that you can operationally park the YS91 and 17000 and leave it there, then again, YS engines always do well at the high RPMs they advertise. I still think the 61 is a better match because 8.5 gearing suits it, and the is 91 at the edge of falling off the power curve (need a really unrestrictive muffler)


I look fwd to what Steve (george0079) says when he gets a few flights at 17K.

Please, ALL READ
I bet some manufacturers are cringing at some of the big block mods being done here. I think its fantastic that some like to push the envelop and have fun doing it. One thing: BE EXTRA CAREFULL. Give yourselves a little more distance when you start pushing hard with the bigger engines. From all that have been said of the TREX plastic grips, it is the wise thing to switch to the metal to avoid unwanted flex or failure when pushing the big pitch figures.

I would hate to read that someone had a accident or a close call not because something let go (and that has to be expected) but because they got careless and did not gave themselves som marging for error.


Like Ron White says: "you can fix stupid" I hope no one here falls in that category.

Santiago
12-29-2007 10:15 PM
 
 
george0079
Elite Veteran
Location: Terra Firma

Quote 
[B]One thing: BE EXTRA CAREFULL. Give yourselves a little more distance when you start pushing hard with the bigger engines. From all that have been said of the TREX plastic grips, it is the wise thing to switch to the metal to avoid unwanted flex or failure when pushing the big pitch figures.[/B

Thank you for the warning. You have a very valid point. And anyone that wants to try this mod should be listening.

And, if it helps to put your mind at ease, please know that I have put every metal upgrade available to me on this heli. As well as using the strongest blades that I know of (VBlades).

This is a hobby, not a competition. I have no desire to push this to the point of danger for myself, or anyone else. Safety is my first priority.

You think your kids are expensive now?

Just wait until they move out!!
12-29-2007 10:27 PM
 
 
MoneyPitVictim
Veteran
Location: Dayton, Ohio

Steve
You are on the right track. Do you happen to know at what height ASL you fly. (Home field elevation in othe words)

Santiago
12-29-2007 11:01 PM
 
 
george0079
Elite Veteran
Location: Terra Firma

I'm right at 170 ft above sea level

You think your kids are expensive now?

Just wait until they move out!!
12-29-2007 11:02 PM
 
 
captain crash
Senior Heliman
Location: wirral uk

hi all, i am just in the middle of putting a ys 91 in my spare 600 sport and i was thinking of using more pitch with less head speed.
at the moment my stick banging fingures will only let me use + and - 11 at about 2150 head speed, what do you think the climb out would be like at lets say +and - 14 at 1950.
at 1950 i was thinking a lower head speed should give me a longer flight time?

Ady i noticed in your gallery, top right hand picture, that your fan is not sitting down on top of the front bearing. ive just drilled my fan out to 5/16 to clear the threads on the crank shaft, but i am now at a stand still because i have not got a flat bottom drill ,to drill the hub deeper where the shank on the crank sits, needs to be about 5 or 6 mm deeper. i could make a spacer?

I am realy looking forward to flying a big block, so any info will be great.
Thanks Derek
12-29-2007 11:59 PM
HOMEPAGE  
 
 
Jay1
Veteran
Location: Colorado Springs

I have mine set to about +13/-13 but I have my gov set to 2000rpm so I am sure you are not that far off. The thing will climb out in inverted rolls with no bog at all. You have to take it easy so your maneuvers are cleaner since now it will climb out quickly with higher pitch.

I am sure others that are doing this mod will have the same type of feel.

Jay
Sooner or later, Gravity will win!
12-30-2007 12:04 AM
 
 
george0079
Elite Veteran
Location: Terra Firma

Quote 
needs to be about 5 or 6 mm deeper

If you drill the hub deeper, you will most likely end up with two pieces.

You think your kids are expensive now?

Just wait until they move out!!
12-30-2007 12:06 AM
 
 
captain crash
Senior Heliman
Location: wirral uk

thanks steve, i see what you mean, the middle of the hub is very thin.
i will make a spacer, to take out the end float or the crank and back plate will be damaged.
thanks derek
12-30-2007 12:18 AM
HOMEPAGE  
 
 
MoneyPitVictim
Veteran
Location: Dayton, Ohio

Guys,
With so much power, the trick is to keep the blades away from a boom strike.

1. Keep the head as stiff as you can via stiffer dampeners. (Infinivation dampeners, etc)

2. Judisious collective management, no pulling on the cyclic while dumping 12-14 degrees negative pitch.

3. Use the stiffest blades you can get. V-Blades are proven studs.( any others?)

4. Keep a camera rolling, the next move could be a "Kodak moment" .

$pit

I forgot
5. Use Spiderman philosophy, with great power comes...
12-30-2007 05:12 AM
 
 
ady
Senior Heliman
Location: norfolk england

yo , another few flights this morning and the engine is starting loosen up nicey , was running 13 degrees each way and even turned the head down a tad and she fly like a dream , seems to feel different to when it had a 50 engine on board , anyway time will tell , the belt isn`t to happy after a half dozen flights , have torque tube set up going on shortly . the head setup i have is mega stiff , this thing just can`t be bogged at all , next time i fly i`ll put it to 11 degrees each way as it was to compare it that way .it even does nice slow sedate circuits too with the head super low , best of both worlds then , just can`t knock it yet , only the belt lets it down but thats NOT the rex`s fault is it , may look out for some 610 blades , not sure yet
12-30-2007 01:33 PM
 
 
ady
Senior Heliman
Location: norfolk england

oh yes and as for the spacer , i`ll sort one out when i get back to work
12-30-2007 01:34 PM
 
 
Sam2b
Key Veteran
Location: Seattle, WA - USA

Ady,
Do you have swash expo enabled on your transmitter? Just curious.

_Sam B_
12-30-2007 07:32 PM
HOMEPAGE  
 
 
ady
Senior Heliman
Location: norfolk england

no expo chap , thats why it looks like it does when i fly it
12-30-2007 07:48 PM
 
 
Jay1
Veteran
Location: Colorado Springs

Ady,,,,, I love the way mine flies right now but right now I am trying to chase down the little tail wagg issue. I think the extra vibration is messing with my 611 but it never did that before. Did you have any problems in that area?

I am still on the belt version but soon I am going with the torque tube also.

Jay
Sooner or later, Gravity will win!
12-30-2007 08:46 PM
 
 
ady
Senior Heliman
Location: norfolk england

hi jay , glad yours ok except the tail wag , i use a futaba 502 on mine with a hitec 6965HB servo , one thing is i`ve never had hassle from the tail ,this is an early rex and the only problem i ever had was the plastic fan , i read many arcticles on waggy tails but mine was always ok , i run 27% gain with t-rex carbon ? white blades , holds really well , perhaps it might go when you`ve ran her in more, mine is starting to get warm now and i`m tryin to get a desent tickover sorted , i`m sticking with the 2100 head for now but will be moving to 5.8v with the align reg , using 5.3 at present , oh on the tail front , the free`er she gets the less it should vibrate , your belt could be shot also , my lastest new one has lasted only a couple of days , was brill when first put on but now its stretched , ii can hear and feel it slip even after adjusting it , marked boom also to make sure it wasn`t that , roll on torque tube time, i`ll be posting some flights pics tomorrow from todays flyin also
12-30-2007 09:28 PM
 
 
ady
Senior Heliman
Location: norfolk england

jay1 , they just do not bog at all , love it like you i do

12-30-2007 09:30 PM
 
 
ady
Senior Heliman
Location: norfolk england

oh , i managed to put some pics on my post , found the fast photo bit , cool , will slow down for the camera man next time
12-30-2007 10:27 PM
 
 
ssrobzoom
Veteran
Location: Tn

Where's the videos?
12-31-2007 02:26 AM
 
 
15 pages [ <<    <     3      4     ( 5 )     6      7     NEXT    >> ]11500 viewsPOST REPLY
Heli Wholesaler . 3D Heli Depot . JR-Spektrum

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Align T-REX 600N 700N > t-rex 600 n sport fitted with ys 91 st 4
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