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Compass 7HV, 7HVU and Chronos Compass Compass 7HV, 7HVU and Chronos Model Helicopter Discussion


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Old 05-18-2012, 09:10 AM   #1 (permalink)
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Default Helical main gear and upgraded tail

Sebastian is working on this 2 upgraded parts as you can see from the last video on the tube.

[ame]http://www.youtube.com/watch?v=-16ZyEnnICw[/ame]

Anyone can confirm and any ETA?
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Old 05-18-2012, 09:40 AM   #2 (permalink)
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Sure is quiet with the H-gear compare to the current straight cut.
Lot's of tail noise too, maybe gain is too high for 2050 to be high enough for 1100hs. BX has no bank switching as in V-Bar.
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Old 05-18-2012, 09:47 AM   #3 (permalink)
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Was that last IU 1100? Damn that sounded quite! I'm guessing 115 tail blades on the new tail?

Yeah I think the gain was too high for the reasons you said Gimpy. Makes me glad I have the GY750 and 8FG combo on my 7HV for this reason. My 450 has the BX.

Edit, and nice landing gear strut "test" at the end Sebastian
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Old 05-18-2012, 09:59 AM   #4 (permalink)
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I find this very interesting because the helical gear must be CNC. It is also interesting because Compass/Sebastian is listening to the requests of the masses. I seem to remember at one time that Sebastian spoke against using a helical cut gear. There must have been enough requests or he changed his mind. Either way, having options like this is nice. It all sounds good and I hope to see these parts soon.
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Old 05-18-2012, 10:11 AM   #5 (permalink)
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I saw the helical on Dave K.'s last weekend. It was black Delrin... beefy and yes, quieter! Compass also made the pinion. No idea on ETA to distributors.
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Old 05-18-2012, 10:13 AM   #6 (permalink)
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Any idea if it's same tooth count and what pinion size was?
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Old 05-18-2012, 10:33 AM   #7 (permalink)
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Quote:
Originally Posted by GimpyGolden View Post
Any idea if it's same tooth count and what pinion size was?
Not sure. The guys testing would have to answer.
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Old 05-18-2012, 10:34 AM   #8 (permalink)
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I just had this cut. Quiter and smoother. Alloy pinion. Same tooth count. Waiting for compass motor to fully test this. Stock has a good tooth shape so it works very well for a spur gear.
BTW helical can be molded. Mikado does a great job with that on their double helicals.
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Old 05-18-2012, 12:55 PM   #9 (permalink)
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I've always wondered what a helical gear does to the motor bearings. Wouldn't it put extra thrust loads on them and shorten their service life, especially on these high-torque motors?
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Old 05-18-2012, 02:18 PM   #10 (permalink)
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Yes, they do, but that's why everyone started putting counter-bearings for the motor shaft. It was for this and the ridiculous torque newer motors produce also. Does anyone know when these helical gears are coming out? That is the only thing i don't like about my compass is the regular cut gears. The tail is fine, don't know why everyone hates plastic so much.
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Old 05-18-2012, 02:45 PM   #11 (permalink)
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Quote:
Originally Posted by sandro12321 View Post
Yes, they do, but that's why everyone started putting counter-bearings for the motor shaft. It was for this and the ridiculous torque newer motors produce also. Does anyone know when these helical gears are coming out? That is the only thing i don't like about my compass is the regular cut gears. The tail is fine, don't know why everyone hates plastic so much.
I'm not sure that is the main reason why everyone put counter-bearings in. Counter bearings were introduced more for maintaining consistent gear mesh under heavy load and as a side effect helped out with the motor bearing issues. I think Bum is talking about the vertical forces on the bearings in the motor due to the screw-like shape of the gear meshes. In other words, a helical gear might introduce forces on 2 axes. The pressure pushing away from the gear, and then vertical forces on the pinion and main gear. I'm not an engineer, so I can't answer about the vertical forces or how significant they might be.
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Old 05-18-2012, 02:54 PM   #12 (permalink)
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I understand what your saying and it makes sense, but I have over 100 flights on my trex 500 and Gaui X5 and bearings are still good on both. Both have Scorpion motors, so I wouldn't worry about it too much. But when are they coming out? does anyone know?
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Old 05-18-2012, 03:03 PM   #13 (permalink)
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Quote:
Originally Posted by sandro12321 View Post
I understand what your saying and it makes sense, but I have over 100 flights on my trex 500 and Gaui X5 and bearings are still good on both. Both have Scorpion motors, so I wouldn't worry about it too much. But when are they coming out? does anyone know?
Ooooh, Ooooh... I can answer that before the Compass Reps... hehe

"When it is ready"
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Old 05-18-2012, 03:06 PM   #14 (permalink)
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Hey Guys,

today we did some further testing and also videos. One of Daniel Jetschin flying my 7HV with helical gear and new tail and doing some really technical flying. We also did some hardcore testing with 2400 RPM and it seems to work pretty good in over 40 flights now.

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

It will be CNC in stock. Bad news - price will be a little high because of the material and CNC time etc.

Effencie of a helical gear is allways not as good as a straight one, but thats about 4%.
The Heli runs smoother - true. I can only feel effencie in motortemperture (about 5-7░C more temperture in average).

Motorbearing doing well. Helix direction was chose to press against the counterbearing. I placed a small washer between pinion and counterbearing and reduced motortemperture about 3-4░C.

Today I did some flying with 1000 RPM - funny you can just hear the blades anymore Tailupgrade with 115mm CF Compassblades works awesome in this headspeed.

Greetings
Sebastian
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Old 05-18-2012, 03:11 PM   #15 (permalink)
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Sebastian, any idea on release date? are we talking next month, end of summer?
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Old 05-18-2012, 05:28 PM   #16 (permalink)
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Quote:
Originally Posted by Sebastian Zajonz View Post
Motorbearing doing well. Helix direction was chose to press against the counterbearing. I placed a small washer between pinion and counterbearing and reduced motortemperture about 3-4░C.
Contact between the pinion and the inner race of the counter-bearing via a washer would be a good approach to lessening the thrust forces. The thrust forces would be spread between the counter-bearing and the bearing opposite the pinion (I guess that would be the top bearing the way the motor is mounted in the 7HV).

Any plans to do helicals for the 6HV?
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Old 05-18-2012, 07:35 PM   #17 (permalink)
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I love it! Such quiet. Any chance the new tail and gears might be available during flying season? Just anxious, that's all.

Scott
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Old 05-18-2012, 07:44 PM   #18 (permalink)
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+1. Same here. Think of it Seb. I bought one of your very first helicopters and flying one of your first production motors. Only fitting I am near the front of the line to get a chance to fly a new Compass tail and gear. Is the sound a primary driver for a new gear? The original seems to work fine.
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Old 05-19-2012, 12:11 AM   #19 (permalink)
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c n c is very expensive, why not just mold it as with raptor e 720 and make it a stock item, we all know helical is the way to go!. The route followed now will make the compass more expensive than some very good machines out there once tail and gears are upgraded. Already just the tail upgrade made my compass cost the same as my e 720, and that is an awesome machine
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Old 05-19-2012, 12:35 AM   #20 (permalink)
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In regards to gain, I have a DX8 for example. I can set different gains to each flight mode, which would allow me to run 2 vastly different HS. I would find it hard to believe that there are not other radios out there with the same feature.
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