What head speed for a Beginner ??

[Mikej]

Guys,

I am building up my 550 currently - a fairly low spec - Gaui 850Kv motor, Gaui ESC, a range of 20C 2100mAH batteries in series, aiming for a set-up for hovering / gentle FF (still learning). I already have a Trex 450 and a Honey Bee King and for small Brushless motors everyone says that they like high revs and a constant speed - is this the same for larger brushless motors as well ??. On my trex and HB I run a ptich curve of 0, 40, 80, 90, 100 - is something similar appropriate for teh Gaui 850 ?

I guess I am looking for a head speed of about 1,850 - 2,000 rpm, I have 14 tooth and 15 tooth pinions - I have been to Dark Horses head speed calculator but I can't work out the appropriate tooth numbers for the primary gears to enter in the calculator, and help gratefully received ??

Cheers,
Mike.

[Hurriken]

Mike,

I have mine set up very similarly to yours. I am also in the hovering / gentle forward flight mode.

I am running the 14 tooth gear, but have ordered the 15, & 16 to play around with. The 14 will get you 1,861, 15 - 1994, 16 - 2127 all at 95% efficiency.

The calculator here works great, and is specific to the Hurricane. (bottom of page)
http://www.readyheli.com/Online_Headspeed_Calculator_s/81.htm

I have found the 14 not to work bad at all, I am however running 470mm CF blades. I get great runtimes 10+ minutes, on 2170 EVO 25's. Doesnt sound like these times are typical to others here, but it is what I get none the less. Others here say that 2000+ smooths it out some though, that's why I thought I would give it a go.

[Mikej]

Thanks Ken,

I am still building it up and will build it with the short boom and try both the 475mm and 500mm blades - it sounds as if my std pitch curved will be a decent starting point as well.

Let us know how you get on with the other pinions.

Cheers,
Mike.

[bclong21]

if you can get the short conversion kit- it wakes this stock motor and gearing up alot! It is not nearly as tail heavy either. Mine will hover hands off for about 3 seconds since I went to the short tail. Before the tail would pull the heli around like it was to big for the disk. jmo, though!

[Phoinix]

In this stage, learning and slow FF it's way too much with 2000. Hurricane will hover at 1000 rpm, so what you need is no higher than 1700rpm. With RRPM higher, hurricane will just get more nerveous and flight time will decay. Nothing in the spectrum of what you're looking for when learning. Set the pitch curve at 80% max with stock motor.

[Hurriken]

if you can get the short conversion kit- it wakes this stock motor and gearing up alot! It is not nearly as tail heavy either. Mine will hover hands off for about 3 seconds since I went to the short tail. Before the tail would pull the heli around like it was to big for the disk. jmo, though!

This sounds like a good step in the right direction. Guess I'll find out soon, I ordered my short boom stuff the other day, and should see it Sat. Now I'm really looking forward to switching this over. Mine flys great but sure feels tail heavy!

[Hurriken]

Well had the chance to do some playing around with the Hurricane this weekend. I installed the short boom, and went to the 16 tooth gear for grins. The head speed calculator at ReadyHeli is pretty darn accurate. I was getting 2100 on the tach with the 16 tooth. The short boom does make it feel different. It seems to be a lot more balanced than with the original long tail.

The increased head speed does increase the sensitivity of the heli to cyclic inputs as was stated by phoinix. But this thing is still super stable even then. I run 100%, w/ 0 expo on the cyclic servo travels, and it feels just fine not twitchy at all, my T-Rex 450 SE I run 65%, and it's still a handful. I did take a hit to my flightimes though. dropped me to the 8 minute range on a full charge.

I also got the updated motor mount with bearing, and new one way shaft. I think I'll put these in and drop back to 14 tooth just to gain back some flightime for right now.

[bstock]

Hurriken - where did you get the 470 carbon blades?

Have you tried any 500 woodys or carbons? If you have... what are your thoughts on the differences? Flight times, stability, etc.?

Thanks!

Brent

[Hurriken]

Hi Brent,

The 470 Carbon's that I have are about 4 years old I originally bought them for an old ECO-8 I used to have. They are MS Composite blades. I know they can still be had but it takes some searching to find them, think they are around $60.

I haven't tried the 500 woodies, I honestly was too lazy to balance them I have a set, and plan on giving them a try just to see the results. Just need to put them on the balancer first. They definitely have more mass so I would speculate that they would chew into flight times, but stability I would think would be better than the carbons for the same reason.

Being that I'm quite the rookie heli pilot i'm not sure of how the carbons I'm running would react if I had to do an autorotation. I suspect that autos might be a bit dicey with the light weight/short length of the carbon blades. I've seen others auto with the woodies, and it looked real smooth.

Hopefully if I get time this week, I'll balance out my 500 woodies and give them a try and report back.

[bstock]

Hi Hurriken,

THANKS for the feedback!!

Looking forward to your insight on the 500s.

Thanks Again... Brent

[digger60]

Ok you motor monsters !! I have the stock 1000w KV800 stock motor with all stock gears. I would like to up my head speed a little (somewhere near 2000). I am using 2 x FP Evo 25 2170 bats with the stock 50a ESC. I dont need rockin headspeed to do a bunch of 3d. Just enough to do fast rolls and loops. Should I be looking at the GAUI 1000 Watt 1100 Kv motor ? Will I need to upgrade my ESC ? I really want to use the above batteries since I have 6 of them already. I would like to get atleast 4-6 minutes of fly time.

I have the short boom and 475 wood blades.

Any thoughts ?

Thanks

Tom

[Hurriken]

Hi Tom,

Your setup is almost identical to mine, only difference is I'm running 470mm carbons, same EVO packs though. I'm currently running the16 tooth pinion and getting 2100 rpm range @ 85% on throttle curve. 15 tooth should get you about 2000 even. I'm probably going to drop back to the 15 myself this week, I'm a little nervous about being over 2000 with the plastic grips. I'm only hovering so not a lot of stress on the grips, but would worry if doing much more. I still get 7+ min of hovering on the 16 tooth but not sure how much amperage I'm pulling. I have an Eagle Tree data recorder on the way this week, so I'll know better what amps, etc.. im running after this weekend.

[digger60]

Thanks for the reply bud. My 475 are wooden blades... Do you happpen to know where I can get some 475 carbons ? Otherwise I would have to get 500 carbons. I really dont want to use wood at that speed.

Also if I order the 15 tooth, is that all I need ? Just replace that one gear ?

Thanks

Tom

[Hurriken]

Hi Tom,

My MSComposite 470's came from fxaeromodels:

http://www.fxaeromodels.com/product_info.php?cPath=49_50_67&products_id=1674

I used to get a bunch of ECO-8 parts from him a few years ago, and he was always good to deal with.

Also, if you order the 15 tooth gear, that is all you will need. It comes with the set screws. No other changes required.

The only other thing I would suggest would be to order the upgraded motor mount, and 8mm shaft upgrade. It may have come in your kit already, you can tell if the motor mount plate has a bearing in it, it is the updated one. Mine came with the non-bearing motor mount, and I have the upgrades. Haven't replaced them yet but plan to when I switch back to the 15 tooth. This should help to support the shaft a lot better, even though I've seen no wear on my gears due to shaft deflection, but then I'm not doing anything but hovering, and slow figure 8's at this point. Upgrading is pretty reasonably priced. You'll have about $20 + shipping in the upgrade.

Here are links to the parts at ReadyHeli:

Motor mount: http://www.readyheli.com/204581_Motor_Mount_Set_with_Bearing_Gaui_Hurrica_p/204581.htm
One Way Gear Shaft:http://www.readyheli.com/204582_8mm_One_Way_Gear_Shaft_Set_L43_Gaui_Hurri_p/204582.htm

[digger60]

I got the new motor today..1000 watt, 1100Kv motor. I also got a 15t pinion and the upgade shaft and motor mount.

Since I am still using the plastic grips, should I stay with the 14t pinion or is the 15t still on with plastic grips ?

Can someone please tell me what headspeed I can expect with 95%-100& thottle on the 14t vs 15t pinion with the new motor? All other gears are stock.

Unless its too dangerious, I will use my 475 wood blades with this new setup.

Also I got a Align 75amp ESC...Just wondering if I really need it with the new 1000 watt motor ?

Thanks

Tom

[Hurriken]

Hi Tom,

Head speeds with the new 1100kv motor @ 95% effeciency are:

14 tooth = 2409
15 tooth = 2717

I would be very worried about these head speeds with the plastic grips.

I've seen Justin Chi's videos and he's running in the 2600 range but has the CNC head. Wicked fast!

When you get it all together I would be curious as to flight times with your EVO 2170's? I'm betting from what I've seen here you'll be in the 3 min range, looks like most going to the 1100kv are running 3300mah to get back in the 6 minute range. Let me know what you get!

[Jactor]

Hi Tom

I have a similar problem to you - I just got my kit and it came with the new 1500W 1100KV motor but also hast the standard 42 tooth main gear and 15 tooth motor pinion which would give the isane (for my plastic head) head speed mentioned above. The only metal upgrades I have are the cnc flybar cage and anti rotation bracket. Have a look at the Readyheli's headspeed calculator its really good for checking gear rations on the hurricane

http://www.readyheli.com/Online_Headspeed_Calculator_s/81.htm

I want to get the headspeed down to around 1800 to 2000rpm so the heli doesnt kill my batteries - only doing forward flight at the moment. I have decided to go with changing the 42 tooth main gear to a 61 tooth (same gear as rear - bonus only one type of spare gear to keep) I am going to try this with both the 15 and 16 tooth motor pinions. At 95% efficiency these are the headspeeds I should see - would be nice if someone does a 17 tooth pinion

15T pinion - 61T main gear - 1777 rpm
16T pinion - 61T main gear - 1895 rpm

Hope this helps
Cheers Jactor

[digger60]

I wonder how much run time I can expect with the 1000 watt kv1100 motor and all stock gear. Does anyone have this setup ? A lot of people seems to have the 1500 watt motor.. I would also like to know if anyone has the plastic grips and wood blades running with this setup ?

Tom

[digger60]

Hi Tom,

Head speeds with the new 1100kv motor @ 95% effeciency are:

14 tooth = 2409
15 tooth = 2717

I would be very worried about these head speeds with the plastic grips.

I've seen Justin Chi's videos and he's running in the 2600 range but has the CNC head. Wicked fast!

When you get it all together I would be curious as to flight times with your EVO 2170's? I'm betting from what I've seen here you'll be in the 3 min range, looks like most going to the 1100kv are running 3300mah to get back in the 6 minute range. Let me know what you get!

Thanks for the reply. I think those run times are with a 1500 watt motor ? I have the 1000 watt motor. I assume you will get more run time from a 1000 watt motor ? I am planning on only running it at 80% max until I get metal grips and CF blades.


Tom