The official 600 stretch mod thread

[nightflyr]

Originally Posted by helihaven

my 600 stretch was originally meant to be *almost* a 900 as you can see from this pic of the original airframe..(before it got cut down)

Interesting tail setup

Have any close up pics of it?

[helihaven]

Originally Posted by nightflyr

Interesting tail setup

Have any close up pics of it?

sure...have an album of the whole build on my profile..feel free to have a look!

[Luvmyhelis]

Hey, if I can I will post up a few for you.



And

[Luvmyhelis]

Plus a few more

[hobbypartz]

Looking good. Might wanna consider the new 65c Gens Ace for your mod!

[helihaven]

she's running on 12s...good ol' hobby king 20-30c turnigy's work great on it

[SidewaysLS4]

Originally Posted by helihaven

I used the metal 8 tooth thundertiger raptor pulleys on mine...had to machine down the ends to get proper clearance...and tapped out the original pin hole for a set screw....or you could just use the thundertiger output shaft as well...and used the same on the front pulley...again shaving the ends for clearance...it'll press fit on like the original align pulley

Any reason to need to use the 8T pulley vs. the 9T pulley?

[Luvmyhelis]

Originally Posted by hobbypartz

Looking good. Might wanna consider the new 65c Gens Ace for your mod!

I have seen the ripples running around in different forums talking about these. But in a 12s stretch I just don't see any way that you could even come close to using the 60c ability. Pretty cool though. This is a large step forward in batter tech.

[helihaven]

none that i can think of...other than the 8's were what i had one of on hand...and it worked...so i ordered more to go with it. honestly didnt know they made a 9t in metal...could overdrive the tail that way too if ya wanted...use a 9 up front and an 8 in the back at the tail...

[SidewaysLS4]

Originally Posted by helihaven

none that i can think of...other than the 8's were what i had one of on hand...and it worked...so i ordered more to go with it. honestly didnt know they made a 9t in metal...could overdrive the tail that way too if ya wanted...use a 9 up front and an 8 in the back at the tail...

Yeah, it comes in a sylish red anodize too!

This size Align is 4.6:1, IIRC...so 5.175:1 would definately help with more than 2 blades on the head...excellent for scalers like a Hughes or Eurocopter

[helihaven]

I'm sure there are a BUNCH of other choices...maybe some that would work even better than the raptor..i just knew it would work with a little tweaking ...didnt know about the 9 tooth though..thanks for the info!

[gerryg]

I have been stretching T600 machines for about 3 years. It adds thrust (or Pop) at little increase in weight.
I have done a negative stretch (before aling released their machine)
A "yardbird" stretch to 690 and 710 - REALLY fly good
A 625 stretch to use CY625 blades
Presenty doing a 640 stretch - belt driven

I don't see a down side to stretches -- all +

[helihaven]

Welcome Gerry! leave it to a Texan to "go big" lol

[Luvmyhelis]

Originally Posted by SidewaysLS4

Any reason to need to use the 8T pulley vs. the 9T pulley?

I thought about this for a few days before answering. The only clear advantage that I can see is in changing gear ratios or in how the belt seats over a larger dia pulley. I did a larger drive pulley in one of my smaller helis to keep the belt from hopping under severe stress when I did throttle pumps. On the smaller pulley, it hopped.

[Luvmyhelis]

One thing I would like to ask at this point, do the tension rollers that redirect the belt drive at the elbow require any special maintenance? And is it possible to introduce ceramic bearings into them just to insure they wont ever seize up under normal conditions?

[nightflyr]

Originally Posted by helihaven

sure...have an album of the whole build on my profile..feel free to have a look!

Very nice work

I like your version of the boom block assembly..
Is it adaptable for torque tube drive and if so would you be interested in making one?

[helihaven]

Originally Posted by nightflyr

Very nice work

I like your version of the boom block assembly..
Is it adaptable for torque tube drive and if so would you be interested in making one?

cant take credit for the boom block...thats from rc-tek...I only WISH I was anywhere NEAR as good as Bob in a machine shop...but it is adaptable to a TT..he sells everything to do it...

I also used his 600 FBL rotor assembly...it has 14mm grip spacing....

[helihaven]

Originally Posted by Luvmyhelis

One thing I would like to ask at this point, do the tension rollers that redirect the belt drive at the elbow require any special maintenance? And is it possible to introduce ceramic bearings into them just to insure they wont ever seize up under normal conditions?

Don't know if its comparing apples and oranges...but have the same setup on my 450 stretch...and it has 300+ flights approaching or over 20 minutes each..and the only thing i have ever done is a few drops of tri-flow whenever i happen to think about it...in fact..the 450 tail has never been apart since i first maidened it. holds like a vise even with a 1600 rotor speed. The sound of it takes a little getting used to though...lmao sounds like a bag full of pissed off hornets whenever you make a hard turn...lol

[nightflyr]

Originally Posted by helihaven

cant take credit for the boom block...thats from rc-tek...I only WISH I was anywhere NEAR as good as Bob in a machine shop...but it is adaptable to a TT..he sells everything to do it...

I also used his 600 FBL rotor assembly...it has 14mm grip spacing....

Thank you for the information

[helihaven]

All those birds you have and no rc-tek stuff nightflyr?