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Electric General Discussion
› Electric Century Hawk
09-07-2003 12:19 AM  14 years agoPost 21
flightss

rrApprentice

franklin,nc

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hacker C50-15L or C50-13L

would the hacker c50's work for the ehawk i have two hawks the hawk III and the sport and was thinking of the change over to electric

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09-08-2003 03:47 PM  14 years agoPost 22
RC-Archer

rrNovice

Armpit, CO

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Well, I got my Hawk Sport assembled in about 4 hours. Since I wanted to see how much weight I can shave off, I assembled it first as a gas model and weighted that.

Hawk Sport (Gas) minus radio and batteries = 6lbs 2 ozs.

After stripping all the gas related stuff off including the starter shaft/bearing blocks, gas tank, clutch,etc.

E-Hawk minus radio and batteries = 5lbs 4 ozs.

I feel that the tail is too heavy so I'm going to splurge on carbon fiber tail feathers. If I can take I+ oz off the tail then I can save 2-3+ ozs in the nose. I also have some cabon fiber kite spars laying around and they're half the weight of the boom supports. (.7 ozs vs. 1.3 ozs ea.)

I haven't done any surgery yet but I intend to trim the fan housing and when my CCPM kit comes in, I'm going to replace the front servo tray with standoffs.

So what do you think? Is there any other areas on the Hawk that I can liposuction some weight off?

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09-08-2003 06:46 PM  14 years agoPost 23
lowandslow

rrKey Veteran

Spring Hill, TN

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Are there any advantages to using Hawk mechanics over the Raptor mechanics? Is there the necessary motor mounting available for the Hawk or are you custom making them? I'm thinking about putting together an E-Heli and I'm trying to work out what I will need and of course the $$ involved.

Thanks!

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09-08-2003 08:23 PM  14 years agoPost 24
RC-Archer

rrNovice

Armpit, CO

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The Hawk is much cheaper than the Raptor. For example Hawk ($160) vs the Raptor ($235). There is no conversion kit that I know off for the Hawk however it is pretty simple to bend and drill a piece of 060 aluminum for a motor mount.. The Raptor requires a $90 conversion kit and you may have to spend some money on carbon fiber stuff to bring the weight down.

You can fly the Hawk right out of the box but if you're willing to throw money at the Raptor to realize the E-Raptor's full potential, the E-Raptor will perform 3D much better than the Hawk. One other advantage of the Raptor over the Hawk is the aftermarket is much, much bigger than the Hawk's so it is easier to find parts for the Raptor.

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09-08-2003 08:46 PM  14 years agoPost 25
spessx

rrApprentice

Texas

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Fred Bronk on ezone sells a hawk conversion kit for $25. I'm using it and it works great.

I think the Rappy may be a better 3D heli out of the box than the Hawk( although I've never a Rappy). I like the fact that it has a belt drive for the tail and that my LHS carries parts for it. Overall the hawk is still less expensive even after considering upgrades.

-Stephen

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09-15-2003 08:43 PM  14 years agoPost 26
RC-Archer

rrNovice

Armpit, CO

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Well so far my Hawk weights 6lbs 10 ozs with batteries. Check out my new graphics from http://www.rotorgraphics.com.


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09-15-2003 09:09 PM  14 years agoPost 27
spessx

rrApprentice

Texas

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That seems extremely light - what is left to be added to the heli in order to make it flight ready? I think mine was about 8lbs with 16 cells.
-Stephen

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09-15-2003 09:35 PM  14 years agoPost 28
RC-Archer

rrNovice

Armpit, CO

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You're right, It does seem light. The only thing missing from the all up weight is the gyro, the rear TR servo mount and an U-bec. I still have to do surgery on the frame to remove excess plastic.

I expect the finished weight to come out at about 7 lbs 2 ozs. ( I hope I didn't just jinxed myself! )

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09-16-2003 12:03 AM  14 years agoPost 29
lowandslow

rrKey Veteran

Spring Hill, TN

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stylusboy,

Where did you get your battery mounts? I've been thinking about picking up a Raven 30 and converting it to E-power.

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09-16-2003 02:31 AM  14 years agoPost 30
stylusboy

rrNovice

Utah

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Lowandslow,

The battery mounts are meant for a Vario Silence. Their site is http://www.variousa.com and I think that the part number is 808/14.

I also ordered the O-rings, but there was a full set included with the battery mounts.

RC-Archer,

Instead of fabricating or adding a rear gyro mount, I simply flipped the upper bearing plate meant for the IC starter shaft upside down and stuck the GY401 to the plate. Of course, you'll want to remove all that "starter junk" since it will not be needed anymore

Spessx,

I re-weighed my eHawk this evening and it is a smidgeon under 8 lbs (7 lbs, 14 ozs) ready to fly.

Tom

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09-16-2003 03:16 AM  14 years agoPost 31
lowandslow

rrKey Veteran

Spring Hill, TN

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Thanks. I may just give the Raven 30 a go and try the conversion.

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09-16-2003 03:31 AM  14 years agoPost 32
spessx

rrApprentice

Texas

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Tom,
You're still not doing too bad! Are you using 16 cells? I think mine even got heavier after I converted to CCPM - the only other thing I changed were the Rotorblades.
-Stephen

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09-16-2003 06:10 AM  14 years agoPost 33
stylusboy

rrNovice

Utah

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Stephen,

That sure seems odd. Maybe it just heavy screws or perhaps really "heavy thoughts"

I tried to keep track of the parts that I removed and added during the conversion. Here's my list:

1. Starter assy - 1.15 oz - removed
2. Gas tank - 1.22 oz - removed
3. Pitch lever - 2.00 oz - removed
4. 90 deg swash - 1.69 oz - removed
5. TR pushrod and brackets - .52 oz - removed
6. AL tailboom supports - 1.62 oz - removed
7. Carb tailboom supports - 1.18 - added
8. TR servo bracket - .71 oz - added
9. IC motor mounts - 1.24 oz - removed
10. Muffler - 3.13 - removed
11. Cooling shroud - .79 oz - removed
12. Cooling fan - .65 oz - removed
13. Clutch and pinion - 2.66 oz - removed

Although I started by recording everything meticulously, things seemed to fall apart as the excitement rose and I began dreaming of flying the eHawk or some load of crap like that

Anyway, I removed 16.67 ozs of stuff and added 1.89 ozs but it is clearly evident that I don't have the weight of the new 120 swash, CCPM servo mounts, new motor mount, and motor. I kept thinking that I'd weigh the missing parts after the eHawk's first "dirt nap" but after 135 flights, there have been no crashes, thus the numbers are still missing.

Mine is running on 16 x HRSC2600 cells. The weight I mentioned is with the stock woodies. I also fly with Maverikk 550mm FG blades but I haven't weighed them yet. The woodies roll and loop pretty well, but the FG blades auto much better. I'm also using some Hitec HS-5245MG digital servos (mini) for the CCPM, which have been excellent and much cheaper than my beloved JR DS-3421 servos. The gyro is the GY-401 and 9253 T/R servo.

If someone has the accurate weight of the CCPM swash and the new servo mounts from the Century eCCPM kit, I would appreciate it.

Tom

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09-16-2003 02:34 PM  14 years agoPost 34
spessx

rrApprentice

Texas

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Tom
I was using the local post office for weighing my heli and if I rember right it was 5lbs, 8oz stock with out the flight pack before ccpm and 6lbs after the conversion. The only other things changed between the weigh in's were the main rotor blades. I was using the stock Hawk III 500mm woodies but moved to fiberglass 550's. Could the main rotor blades have made that big of a difference? I'm going to weigh the blades tonight.
-Stephen

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09-16-2003 03:33 PM  14 years agoPost 35
RC-Archer

rrNovice

Armpit, CO

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Yep, weight your blades and also while you're at it, weight your canopy. The stock blades are listed at 124 gms and CF blades are around 109 gms. I couldn't find any listing for FRP blades.

I believe I saw a thread somewhere about some guy hyperventlating because he got a flimsy (read lightweight) replacement canopy instead of the durable (heavy) canopy that came with his Hawk.

So it might just be possible that I have a lighter canopy than you do. Otherwise my weight list is just about the same as yours except that I also replaced the heavy plastic tail feathers with carbon fiber feathers. I'll weight my canopy and tail feathers tonight and see how they compare.

I probably should add that I HAD a lightweight canopy. The vinyl stickers that I added to the canopy probably doubled the weight of the canopy.

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09-16-2003 07:41 PM  14 years agoPost 36
lowandslow

rrKey Veteran

Spring Hill, TN

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Weight wise what would be a better choice for an e-conversion, a Raptor 30 converted to CCPM, a Hawk converted to CCPM or the Raven 30 which of course is already CCPM?

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09-16-2003 08:52 PM  14 years agoPost 37
RC-Archer

rrNovice

Armpit, CO

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I just weighted my canopy at lunch time and it came out to 6.25 ozs. I'll weight the tail feathers tonight when I have more time.

Tom, I'm not really surprised that the CCPM kit is heavier than the original collective because in the original collective, you just removed three pushrods and the collective mechanism.

Then added three aluminum mounts, three push rods, an aluminum anti-rotating plate, and then topped it all off with a pretty shiny new aluminum swashplate. Shiney aluminum is heavier than plastic.

Anyway while I'm still planing on replacing my collective with CCPM, for now I'm planing on installing my Co-Pilot and I need to use that with collective.

Lowandslow, I think that the Hawk will come out lighter than the Raven or the Raptor but you won't need to add any upgrades to the Raven.

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09-17-2003 02:16 PM  14 years agoPost 38
spessx

rrApprentice

Texas

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Here's some more pics of my bird after some work last night. I removed the entire front frame and moved the electronics. I'm now at 5lbs (via bathroom scale which measures in .5 increments) with out canopy and batteries. 8 lbs with batteries( 20x2600's) but without canopy.

Well anyway, I've got some pics but I can't figure out how to post them here. I'm going to stick them in the ehawk post on ezonemag.com

-Stephen

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09-17-2003 04:21 PM  14 years agoPost 39
RC-Archer

rrNovice

Armpit, CO

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5 lbs. Thats pretty good! So how are you going to mount your canopy?

I just saw another post that said that Century upgraded the canopy to a lighter material so that may account to the differences in weight between my Hawk and yours or Toms.

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09-17-2003 04:38 PM  14 years agoPost 40
spessx

rrApprentice

Texas

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Not sure how I'm going to mount the canopy. I'm still waiting on a newer sport canopy to arrive - my old H3 canopy will not work with ccpm.
-Stephen

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