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Hurricane 550 Discussion and support of the Gaui Hurricane 550 |
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04-28-2012, 04:05 AM | #1 (permalink) |
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Join Date: Apr 2012
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Converting 550 to 425- minimum amount of changes?
Hi all,
I have a 550 Hurricane that I would like to convert to a 500 size by converting it to the 425 version- to use as mechanics for a scale 500 size MD500e. Ive already ordered a 425 boom, shorter belt, tail pushrod, and 425mm blades. Would I be able to get away with just these changes and none to the motor/gearing? Thanks. |
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04-28-2012, 10:09 AM | #2 (permalink) |
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Join Date: Aug 2008
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Sounds like you have the tail sorted out with those parts, the only thing you need to think about will be raising the head speed when using the smaller blades...like 2600 or higher
What is your gear train now? PT
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Gaui 550(Need GOT ONE!) / KK2.1.5 steveis pro/ZMR250 / Alien 450 camera ship / HJ 450 all W/KK2.1.5 Steveis pro Estes Nano/ Hubsan X4 / Syma X1 AMA 953414 CONTRIBUTOR, TEAM LAVAQUAD |
04-28-2012, 11:32 AM | #3 (permalink) |
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All I know is the front/rear mains are 42/61. And its got the Gaui 850kv motor on it. Would this setup with a 6s not spin the head fast enough for the 425mm blades?
Thanks |
04-28-2012, 01:48 PM | #4 (permalink) |
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Location: Michigan, slightly Northeast of Hell
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In a word, no. With a 14 tooth pinion and 20 tooth OWB gear, you will get only 1856 rpm. With a 1200 kv motor you're more in the wheelhouse. With your current motor, you would have to use a 19-tooth pinion to get in the wheelhouse.
Scott
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04-28-2012, 01:55 PM | #5 (permalink) |
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Okay, so I counted 15t for the pinion and 19t for the OWB(for somereason it stays locked both ways??) I DLed a calculator and found that a 20T pinion will yield 2569rpm (from memory) I ordered a Revco 20T 0.6M for a 5mm shaft. Am I on the right track?
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04-28-2012, 03:33 PM | #6 (permalink) |
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Join Date: Dec 2008
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If you are looking to keep the cost down, check the classifieds here on HF. There are usually some used Scorpion 3026 -1210kv motors for sale that would work with your gearing. Or you could pick up a 3026-1400kv and change the front gear to a 50T instead of the 42T. Both of those would get you in the ball park of around 2600 or so head speed with a 14T pinion.
Jerry
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I don't need the latest and greatest. I just need more time to fly what I have. Align 450 Sport V2, Gaui 200, Gaui 425 x 2, "HeadHunter 500, Gaui 550, all Flybar'd |
04-28-2012, 04:31 PM | #7 (permalink) |
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OWB should be free turning in one direction, not both. Time to order a new 20T....AND Shaft!.
PT
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Gaui 550(Need GOT ONE!) / KK2.1.5 steveis pro/ZMR250 / Alien 450 camera ship / HJ 450 all W/KK2.1.5 Steveis pro Estes Nano/ Hubsan X4 / Syma X1 AMA 953414 CONTRIBUTOR, TEAM LAVAQUAD |
04-28-2012, 06:01 PM | #8 (permalink) |
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Yes, you're on the right track, but you have the wrong pinion. Gears on the 425/550 are mod .8. You will need to find a mod .8 pinon. If not, you will strip gears every time the motor spools up.
Here is the pinion I would get-- I hope you can still adjust mesh with this size pinion. I know Nexgen used to use some pretty large pinions so I'm thinking this will work. http://www.amainhobbies.com/product_...inion-Gear-19T Scott
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04-28-2012, 06:52 PM | #9 (permalink) |
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Scott is correct...Mod.8 is what Gaui's use...I have a 20T here if you want to try it...
PT
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Gaui 550(Need GOT ONE!) / KK2.1.5 steveis pro/ZMR250 / Alien 450 camera ship / HJ 450 all W/KK2.1.5 Steveis pro Estes Nano/ Hubsan X4 / Syma X1 AMA 953414 CONTRIBUTOR, TEAM LAVAQUAD |
04-28-2012, 07:21 PM | #10 (permalink) |
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Ahh, thats what I get for being impatient. Oh well.
I was using the Gaui headspeed calculator, and the Revco pinions are in the options, so I assumed mod .6 was the one, since thats all they carry for a 5mm shaft. Cool, thanks for that part number. Should I really use the 19t pinion with the 19t OWB? Wouldnt a 20t pinion work better @ 2659rpm? It looks like there should be enough clearance for correct mesh. The way it is now with the 15t, I can slide the motor over 10mm out from where it is. Thanks guys, youre a wealth of info. And I'll have a closer look at why that OWB is locking up. Senji |
04-28-2012, 09:09 PM | #11 (permalink) |
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Another problem I see with running a 20T pinion and 42T front gear is that you will have a 2.10 gear ratio in that gear area. That will likely cause excessive heat on the gears themselves, not to mention poor torque that will likely bog the motor on collective inputs.
To be honest, I think your best bet is to get a higher kv motor, then gear it for a head speed of somewhere between 2600 and 2800 for a scale model. I run both of my 'pod and boom' 425's at around 3000rpm for performance. Jerry
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I don't need the latest and greatest. I just need more time to fly what I have. Align 450 Sport V2, Gaui 200, Gaui 425 x 2, "HeadHunter 500, Gaui 550, all Flybar'd |
04-28-2012, 09:53 PM | #12 (permalink) |
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Location: Michigan, slightly Northeast of Hell
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I agree with Jerry. You may end up pushing that motor too hard and causing damage to the gear train, but if that's what you have and if that's all you'll get, you have a solution.
I'd get the 20 tooth OWB. A lot of us have been scared away from the 19 tooth OWB and opt for the 20 tooth because of the problems associated with the early 19-tooth OWB's. In my case, I tried to avoid as many problems as I could from the start. Scott
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04-28-2012, 10:15 PM | #13 (permalink) |
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Hmm. I think Im going to re-plan this a little, because the long term goal was going to be to put a 4 blade rotor head on it. I think its going to be a waste to upgrade motor and esc just so I can fly the stock head temporarily.. I just wanted to get up and flying with the new fuse before splurging with pricey rotors and 3-axis gyros..
So a little shift in plans.. Before I take this to the scale forum. Anyone have experience with scale 4bladed rotors? I believe there are scale T-Rex 500s with 4 blades running 1500-1800rpm. The current motor/gear train might be all I need. Thoughts? |
04-29-2012, 08:00 AM | #14 (permalink) |
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That's what I was thinking too, but I don't know if you will have enough torque with that motor. I went from a scorpion 3026-1210 to a 4020-910 kv motor on my 550 and now after a 5 min hover at 1700 rpm headspeed, the motor comes down cold, where before, the 1210 was too hot to touch. Good luck on that scale build
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04-29-2012, 08:50 AM | #15 (permalink) |
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If you're going scale, you're okay. You'll have to figure on soft damping. Whichever FBL unit you use, make sure it's got the ability to adjust phasing electronically--it may come in handy with a multi-rotor head. That's about all I know about that subject.
Scott
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