Stratus conversion

[misskimo]

dang , what pitch are you running at , my Ion on 2 10s2ps last year didnt hit no where near that , had great performance , but I was only running 690 Vblades and 12 degrees of pitch , dang batteries weighed 4 lbs 4 oz , ran good . 3 volts , those evos wont last long , you got to have what 14 degrees of pitch to get that , :WOW
Scott Glasgow Ion 2 10s2p ran in Parallel MO event 06) (http://video.helifreak.com/?subpath=Misskimo06&filename=ScottGlasgow_ionSpringfieldMO06.wmv)

[MrMel]

Well, since the Eagletree died I dont know if it 3.0v for real.. :?

So i can be totally wrong, but it will show next week when I get some better logging equipment :glasses2:

[MrMel]

Ive rebuilt the drive train on my stratus so I could get better 12s gearing.

Here is how it turned out.

Im using an 8mm shaft actro, precision coupler and 5 mm shaft from SDP and a mikado pinion.
The upper bearing mount is original, but Ive changed the bearing to use a 19/5mm bearing from Boca. And ive moved down the bearing holder so its as low as possible, giving max support for the shaft.

pinion dont cover the whole of the main gear, but thats not an issue.

With this I have 100T main gear, and 9T pinion.

http://www.dacsa.net/heli/stratus/Cimg1171.jpg

http://www.dacsa.net/heli/stratus/Cimg1170.jpg

http://www.dacsa.net/heli/stratus/Cimg1169.jpg

http://www.dacsa.net/heli/stratus/Cimg1167.jpg

[misskimo]

yeh ! Im afraid you will see a main gear slick soon , been there done that . 9t is way to small , with these better batteries , and the amount of power the 32-3 puts out , looks like you will mill those teeth right off , Im thinking with the 32-3 , no less than a 11t , use to be a 10t was the min.

[MrMel]

Worked fine for 50+ flights in the Raptor 90 with 710 blades, so I will give it a try.
Just need to get the gearmesh correct.
Getting the upper support close also helps.

[MrMel]

Testflied a few times today, worked like a charm, no abnormal gear residue.
Re-adjusted gearmesh after the initial few flights, so I think it will hold well now, time will tell.

One thing, Had the new "SuperStubz" on, talk about wicked cyclic rate, feels like a T-rex 450.

[misskimo]

superStubz ? what is that ? some kind of new paddles? hope it holds out , and yeh! time will tell , you running 12s right ? yeh! that upper bearing will help alot , back in the day almost 4 years ago , when I went 13 and 14s with the Fury. a fellow by the name of Ben74 did a predator on 12s , he was useing 2 logo 9 tooths pinions on the airplane version actro, stripped them 2 times on the older gen 1 TPs , the 9 tooth , just dont have enough gear mesh to last, we both were also useing the 40-70 schulze. man I sure liked mine , about the same weight as the 32 schulze. the warning you get , ( NONE) when it strips , did my first successful auto on a house pad over tundra. mine was due to the shaft breaking inside the MA 10t pinion on the airplane version actro 32-4

[MrMel]

Super Stubz are the new CY paddles, 105mm, about 14-15 grams!

Ive already broke a shaft on the E-stratus, but the break surface looked old, so I suspect it had gotten a hit before, however, the parts I used now is precision grade, so they are alot better fit then normal stuff.

Key for me has been to adjust the gearmesh after the first few flights, not just "let it be", so let it wear in and re-adjust, also make sure pinion running exactly 90 degrees to the main shaft. Time will tell.

[misskimo]

yeh! Chris told me what I wrote , 9t was a no no on these big birds. it tends to shear them off like a metal shear. but anyway , yeh! I know what you are saying , a perfic mesh will last alot longer. I MT the tobacca out of a cigarette to set my mesh , works great and folds and bends with the teeth tight, not like most people use plastic from a bag. bend that in the teeth and end up with a bigger mesh

[MrMel]

Main thing I want to compare 100/9T @ 75% on the powerjazz, to my ion which have 100/10T at 58% on the powerjazz.

If there is no difference I could go back to 10T again.

Good thing the powerjazz can handle even sub 50% throttle, amazing ESC that is, like a big regulator, without any ill-effects what ive seen so far.

[misskimo]

you should see alot more torque and way better on the over all system, but the leverage action of the 9t isn very efficiencent. its right on the edge. tight gear mesh and like you said , time will tell, on the evant , I decided to install a 12 tooth on the top ratio of the belt drive, due to a MA pilot stripping a 100t main gear about 4 months ago useing a 10t , so now I will have a 10.92 . Im worried about the Hirobo main gear shreading , its thinner than a MA gear ,

[OICU812]

Looking good Fredrik! Word to the wise on the most recent batches of Actro motors.....I have now had my last two Actro motos chew up the motor shaft inside the bottom inner race of bearing. Most recent one I popped out with light tap of hammer, no loctite of any kind! So word to the wise if you have an Actro put some 680 or sleeve retainer on the inner race of bottom bearing and motor shaft to avoid this terrbile thing, arg!

[MrMel]

I have a LRK motor on the way, should show up this week.
(12s motor, 420kv, made for the .90 sized revolution heli)
It uses 8mm shaft (as well as my conversion does here), so it should be drop in replacement.

[OICU812]

NICE! :glasses2:

[cgbole]

thanks for the heads up Shawn. did your motors have a 8mm shaft that was turned down to 5mm? the one i burned up had a 8mm shaft turned down to 5mm on the end.
i have a powerjazz in hand and should have another 32-3 this week.
Fredrik, how is that 9T pinion doing? the Neu 1915 1.5 is coming down after a 4 min flight at 156 - 159 deg F. on 9.5:1 i'm running one of those sae controllers seems to be doing fine but can't wait to get the powerjazz installed.
thanks
chuck

[MrMel]

Actually, 9T/100T is too low for my liking.
With that it will bog down more then I like, since my target HS is 2050.

RPM at low load: 2151 at 44,4 volt
RPM at medium load: 2006 at 40,08 volt
RPM at full load: 1861 at 38,4 volt

[Laurens]

Is it a Strecker?

[MrMel]

Hmm, Stripped main gear today. Tried a new motor (1915/1.5Y) with 11T/93T gearing.

2 x TP 6s1p 5000's

Bad about the maingear, on the other hand, power.. was... AMAZING... :WOW

I couldnt bog it, used +12 degrees pitch and could do whatever I wanted...

http://www.dacsa.net/heli/stratus/stratus.jpg

:smokin:

[MrMel]

Mesh on the gear was good, so I wonder if the motor which heats up very much (as do the shaft and pinion) could be the cause why it stripped...
Or is it just too much power...

[TomC]

Mel,

Probably just too much power. I saw Bobby Watts fly an Ion-x2 on 12s last Friday and he was using a doubled up 90t main gear. Even with the belt drive, he said this was necesary. Also had 8mm shafts on Actro motor and secondary pulley. He used the same cells as you, and it made heaps of power. His pitch was +/-15 deg and I never heard it bog once!

Cheers,
Tom C

[MrMel]

Yeah, Im thinking going dual gears too

You dont have a picture of that setup by any chance?

[misskimo]

hey , cool , wll not cool about the main gear , how was the temps on the motor ?

[cgbole]

sorry Mel, was that on the 9T and actro?
got back from the Bolivar Mo. funfly. had a blast. wish you could have made it Tony. i'm uploading some video now. the powerjazz works awsome! and the 1915 1.5y is staying between 158 to 160 deg. F sofar.
the inside of the case is always a few degrees cooler. i got lazy and didn't put the actro in it yet but i wanted to give the Neu a proper work out first.
i'll post a link to some video...
chuck

[cgbole]

here ya go...
http://www.youtube.com/watch?v=0JZ1xhhxbsA
chuck

[MrMel]

sorry Mel, was that on the 9T and actro?


Nope, 1915/1.5Y with 11T and 93T main.

Hmm, doublestacked main gear would require removal of some frame parts (CF above tail servo) wonder if that will lower the integrety of the frame much...