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HelicopterCentury Radikal G20-30 N640 Hawk Predator › ???"s for Hawk Pro pilots
11-20-2006 04:32 PM  11 years agoPost 1
lrogers

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Mobile, Al

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I'm thinking about getting a Hawk Pro as an inexpensive "beater" helo (kit cost looks good). What tpye of servos are you all using? This would be I'd like to keep on the cheap side.

Larry Rogers - R/C Helicopter Pilot

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11-20-2006 04:49 PM  11 years agoPost 2
SteveH

rrProfessor

Texas

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Larry,

You can get by with standard servos, for a while, and then they will develop lots of slop, especially on the collective and aileron servo. Single ball bearing servos will last longer, and dual ball bearing servos will last a long time. If you install the balls on the bottom of the servo arms and add a simple brace to the center of the aileron servo, as in the picture, it will last longer.

The government cannot give you anything without first taking it from someone else.

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11-20-2006 04:54 PM  11 years agoPost 3
lrogers

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Mobile, Al

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That is slick! Thanks for the suggestions Steve.

Larry Rogers - R/C Helicopter Pilot

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11-20-2006 10:15 PM  11 years agoPost 4
BC Don

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Calgary, AB Canada

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I've used the Futaba 3151s.

Got Money? Send it to me, I'm a Heli Addict.

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11-21-2006 12:16 AM  11 years agoPost 5
Syclic

rrApprentice

Northern Hemisphere Ont.

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lrogers

I think you will find it ideal for that application. There are a growing number in this neck of the woods that fly the big block nineties and who have acquired hawk pros last summer.

Some are powered with OS37's and others with Toki 40's (I have powered mine with both). Man-o-man, these motors have finally given these 30's the power to weight ratios they deserve. Yee-haw!!!

We use everything from S3151's to S9202's to S9252's. As these helis seem to have a relatively slop free control system, I have found that they are the only 30 that really can feel the difference beteen real good servos and the lesser ones. But even with the S-3151's you will like how well it flies. And like many of us, may find spending more time flying it then your big-blockers.

Due to the mechanical system it uses you may want to use some collective to cyclic mixing (for-aft and a bit also on roll cyclic) to maintain a level swashplate from full negative to full positive. Then you will find this heli to, not only be stable enough to hover or fly forward "hands off" right side up, but that it also will do so inverted!! The only 30 I have been able to get to do it, as it has remained relatively slop free through the 200 plus flights mine now has logged!

The only changes to mine from stock, is to 3D tail fins and a set of CNF5533 fiberglass/graphite mainblades.

For the little money invested, I cannot get over how well it performs. And repair costs are less then a set of blades for a 90!!!

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11-21-2006 12:52 AM  11 years agoPost 6
perfesser zero

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Dublin, VA., USA

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Cost of repair parts...
Look at it this way. You'll never be out more than the cost of another kit sans CF Blades . Lowest cost crash kit on the market.

Later...

Scott!

Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S

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11-21-2006 02:45 AM  11 years agoPost 7
BC Don

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Calgary, AB Canada

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During setup I find that I can be about 1 degree off depending whether I start with the stick at the bottom and move it up to my hover position or whether I'm at the top and move it down to the hover position. I'm sure that in flight it all evens out though.

Got Money? Send it to me, I'm a Heli Addict.

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11-23-2006 04:32 PM  11 years agoPost 8
paddle

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Ocala, Florida

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Servo brace
Steve.
Where do you get parts for that brace you showed in the picture?

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11-23-2006 04:45 PM  11 years agoPost 9
SteveH

rrProfessor

Texas

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I scavaged them from an old Dubro "V" tail mixer that I had laying around. Yes, I'm really that old and have really been in RC that long.

Have a happy Thanksgiving!

The government cannot give you anything without first taking it from someone else.

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11-23-2006 05:03 PM  11 years agoPost 10
paddle

rrNovice

Ocala, Florida

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Too bad! Had hoped they were available. I do not have those old parts. Good idea though. It is like adding another bearing.
BTW, you can not be older than I am, I voted for NIXON!!

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11-23-2006 07:12 PM  11 years agoPost 11
COOKIEULT70

rrApprentice

CAMERON PARK, CA

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Ball links can still be had at the LHS. Just print the picture up and go down there. The parts will be in the plank hardware section.

GAHH!!! Someone call 911!! My wallet is bleading heli parts!!

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11-24-2006 02:37 AM  11 years agoPost 12
perfesser zero

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Dublin, VA., USA

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or...
if you can find some of these little jewels, you'd be set (mine aren't for sale). I did find a few at the local hobby shop here (76 miles away!), but they are around $10 a piece, but they may be worth it if you're not handy or inventive.

P.S. - I voted for Nixon too! That's how old I am!!!

Later...

Scott!

Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S

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11-24-2006 02:50 AM  11 years agoPost 13
GyroFreak

rrProfessor

Orlando Florida ...28N 81W

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lrogers
I had an old Hawk I was rebuilding for my grandson, but it turned out cheaper to buy a new hawk pro which had a torqe tube tail drive and a beefer main shaft, plus it is standard with 47 ball bearings. Seems just about every moving part is ball bearinged (except sliding parts). I'll probably buy another just for a complete crash kit.. Oh yeah, parts availabilty from Century seems [normally] to be very good and they ship fast.

SteveH Great way to improve the servo stiffness, gotta do that to mine.

perfesser zero I like your counter shaft mod. I will do that next time I disassymble (which may be soon the way I fly).

Also made a swash plate leveling tool. (ignore the threaded hole, left over from another project)

I think about the hereafter. I go somewhere to get something, then wonder what I'm here after ?

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11-24-2006 03:53 AM  11 years agoPost 14
perfesser zero

rrKey Veteran

Dublin, VA., USA

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nextstepheli...
Well I can't take the credit for the mod as it's really SteveH's idea. I just had to pull my frames apart on the last Hawk crash and decided to go and do Steve's mod. I posted those pics to give several others an idea what was happening. Go pat SteveH on the back for coming up with the idea, but it's a great mod regardless.

Later...

Scott!

Tiger 50 - OS 50SX-H
Hawk Sport - OS 37SZ-H
Raptor 30 - OS 37SZ-H
JR 10X/R950S

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11-24-2006 12:19 PM  11 years agoPost 15
SteveH

rrProfessor

Texas

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Scott,

It wasn't my idea, it was JR's, and I wish the sets that you have were still available.

Nextstep,

That's a fine job on a leveling tool. You must own a lathe and a mill.

The government cannot give you anything without first taking it from someone else.

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11-25-2006 02:23 PM  11 years agoPost 16
RotorRage

rrVeteran

Lake Charles, La.

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Just don't use JR st47bb servos. I had one fail and one with LOTS of slop after only two two gallons. I recently put in some Hitec HS-635HB servos. Thay have duel bearings, Karbonite gears and 69oz-in of torque at 4.8v or 83oz at 6v. Time will tell how they hold up but i can feel a change in the controls. I think they were about $28 a peice. I'm not an expert thought. It's just what i'm using on a low budget.

A friend will bail you out of jail. A real friend sits with you in the cell saying"That was awe

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11-28-2006 03:44 AM  11 years agoPost 17
paddle

rrNovice

Ocala, Florida

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HI Tech Servos
RotorRage That sounds like good servos! Problem though, big holding power means big power users. Have now allready problems keeping my battery power up using 1600 ma NiMH, using stnd servos except for digital tail. Have to charge every 8-9 min flight of just flying around, no 3D. What are you guys using for batteries?

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11-28-2006 06:43 AM  11 years agoPost 18
COOKIEULT70

rrApprentice

CAMERON PARK, CA

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I'm using a 2000mah NiMH pack. All digital servos. Charge every 4-5 flights. Put back in 1100-1200mah. This is just hovering around and some fff.

GAHH!!! Someone call 911!! My wallet is bleading heli parts!!

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11-28-2006 12:45 PM  11 years agoPost 19
RotorRage

rrVeteran

Lake Charles, La.

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I'm just using a 1400mah 5cell nicad pack. I'm mot sure how many flights i can get. I never fly more than 4 times in a day anyway. I always use a load tester before each flight just to be sure.

A friend will bail you out of jail. A real friend sits with you in the cell saying"That was awe

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11-28-2006 05:20 PM  11 years agoPost 20
oldfart

rrProfessor

Vancouver, Canada

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Batteries?
I always use NiCd's or Lipo w/ hi-amp regulators, no more NiMh's. The NiCads can give out a lot more amperage before dropping too low in voltage under heavy digital servo loads.

If you use NiMh be sure they are the ones designed for high amperage draw, if not you will be lucky (even with the 2700's) to get 2 flights safely with them.

I ran tests on them a few years ago and found them very wanting. For example, on a fully digital servo equiped Raven that consumed 381mah per hard 3D flight, I could only safely get 2 flights form the 2700 NiMh pack??? After drawing less then 800 mah from this 2700 mah pack during these two flights, it could not deliver the required voltage at the higher amps required for more flights!!! And if tested with a standard R/C voltmeter that could only put a 1/2 amp load on them they still showed over 4.9 volts. So one would think they should still be safe for more flights. NOT. Because when loading at 3 amps or more, (common with all digitals through hard maneuvers) they dropped to below the 3.9V threshold of the receiver causing it to go into battery failsafe!!!

I have not tested any of the newer NiMh that are supposed to be better in these areas, but have found no reason to, as they are as big and heavy as the 1800 and 2400 SC NiCds I am now using on my flight packs. And the NiCds still can take 3 x more charge cycles then the NiMh's.

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HelicopterCentury Radikal G20-30 N640 Hawk Predator › ???"s for Hawk Pro pilots
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