Helical main gear and upgraded tail

[NRPY]

Only real problem with the E720 is it is quite ugly. Does anyone make an aftermarket canopy without that big blowhole in the front?

[belcom]

Originally Posted by NRPY

Only real problem with the E720 is it is quite ugly. Does anyone make an aftermarket canopy without that big blowhole in the front?

+1 I know that they're good quality but the authentic TT look is just killing me When are they going to change the canopy shape at least?

[Stolla]

guys its like your kids they are just the prettiest kids in the world....meanwhile to others ... Btw mine are ths prettiest, really, I'm not joking!
in real life the raptor looks much better than in pics, many remarks how they like the look when they see it for real, kinda like tdr, in pics it was ugly when they first released it, but for real it looked like the thoroughbred it is. personally I like the look
I'll see if I can fit the cp cano for u guys!

[DannyvG]

Originally Posted by Sebastian Zajonz

Its 127T and 14T Pinion and new Compass Motor 4926 510KV.

Why are you going to 127T in stead of the original 136T?
Does it have to do with mod1 being different for slanted gear in stead of straight gears?

[Bubba Gump]

Originally Posted by djamgils

Why are you going to 127T in stead of the original 136T?
Does it have to do with mod1 being different for slanted gear in stead of straight gears?

I'm gonna take a guess it's because of machine limits they can only cut mod1 gear a certain width.

Sent from my SPH-D700 using Tapatalk 2

[EricW]

Mhh, CNC limitations, don't think so.
Make a normal (straight) CNC 136T gear also please (OR even bigger if possible), i don't mind a bit of gear noise at all.
Now I have to buy a new motor...... next to my new CNC gear .

[Mr Nice Guy]

I agree. I really like the fact that the 7HV has a larger tooth count than many helis out there. Going to a smaller tooth count is a step backwards IMHO. It minimizes gearing choices and increases the chance of stripping the gears due to having to run a smaller pinion for "lower" head speeds. Not everyone wants to run 22-2300 head speeds and the larger main made it easier to gear for lower headspeeds without using a very small pinion that is more prone to stripping or having to use a low KV motor. Maybe the slant gear is larger than a straight of the same tooth count. The 700e gear was only a few teeth off from the straight so????? It's still better than the 112t main on the 700e that severely limits gearing options.

[DannyvG]

Originally Posted by Mr Nice Guy

I agree. I really like the fact that the 7HV has a larger tooth count than many helis out there.

It's still better than the 112t main on the 700e that severely limits gearing options.

Totally agree with the first parts.
And with regards to your last statement. Thats why I am LMAO with the 100T maingear on the Gaui X7. Shows how much they know about construction principles.

[Sebastian Zajonz]

127T helical Mod1 is allmost the same outside diameter as straight 136T one.
Thats because of the normal modul. 136T helical would be far too large.

[EricW]

Ahh, thanks for clearing that up sebastian.

[Rob43]

I think to chime in on Stolla's point, is where is this going? Upgrade options, or standard parts? I've never had a design problem with the gear. The tail isn't the most solid of the helis I've owned, but doesn't have trouble for me personally. I heard this gear was being developed to address some customer complaints. I really appreciate how Compass listens to the user in that regard.

Thanks for the exciting new concepts.

[DannyvG]

Ok, what I somewhat hoped for
For the others to understand (and how I understand, could be mistaken)

So I guess you have a 20degree slant angle?
136*cos(20)=127.8

[Mixmaster Pilot]

Rob, I'd like to know as well. I'm pretty confident of why the tail has been developed, but the helical gear is a surprise, marketing maybe? But either way this thread reinforces my belief in Compass.

Originally Posted by djamgils

Ok, what I somewhat hoped for
For the others to understand

So I guess you have a 20degree slant angle?
136*cos(20)=127.8

Wow, the first time I've seen cos in 18 years Nice work, my math skills have devolved to basic + - / *

[Caleb White]

Originally Posted by djamgils

Ok, what I somewhat hoped for
For the others to understand (and how I understand, could be mistaken)

So I guess you have a 20degree slant angle?
136*cos(20)=127.8

You're probably on right track. I would swap red/green on slant diagram... if both mod 1 than normal (perpendicular) gap on helical is red = red on straight. so you can see that the horizontal gap on slant (you have red) would be slightly wider than on straight cut, therefore less teeth in given circumference.

I wonder if there are limitations of helical 13T pinion compared to 13T straight? Prob not, again wouldn't it too be slightly larger diameter.

[TheBum]

Originally Posted by djamgils

Ok, what I somewhat hoped for
For the others to understand (and how I understand, could be mistaken)

So I guess you have a 20degree slant angle?
136*cos(20)=127.8

Thanks for the diagrams. The corner of my brain that understands geometry just got dusted off and it makes perfect sense. I agree that red and green should be swapped in the first diagram so that the colors mean the same thing in both diagrams.

Somebody needs to show this diagram to people who paint parking spaces. I don't know how many times I've seen perpendicular spaces turned into angled spaces without changing the spacing at the curb. It makes for very narrow spaces.

[myrseth]

I am perfectly fine with the straight cut maingear but idd like the helical for sound issues. Over here more and more clubs get complaints on sound from clubs. I see the helical as one more thing to ensure my heli don't get the club closed

[Caleb White]

Originally Posted by myrseth

I am perfectly fine with the straight cut maingear but idd like the helical for sound issues. Over here more and more clubs get complaints on sound from clubs. I see the helical as one more thing to ensure my heli don't get the club closed

Me too... but then the helical is black and looks sexy. It is also a good thing to show off, as many times it is one more thing people check off in their minds when comparing helis.

Really?? club sound issues with electrics.. that's new. Hope you guys don't have problems.

[sandro12321]

Is there any estimate on release on the gears?

[myrseth]

No Caleb we don't have any issues but I feel sometimes the el scream is worse then the nitro, just being proactive. ATM plankers love my 7hv because of the kind sound outside the bladefarts ofc

[Rob43]

I know when I spool up in the driveway, the wife complains of the noise . There is a very high frequency noice emiitted by the drive controlling the motor. I hear it above the blades unless the left stick is at exteme throws. (That's collective for you Mode 1 dudes.)