Extreme Speed Prop Planes Discuss the need for speed with fast prop planes (Screamin Demon, Diamond Dust, Shrikes or any REAL sound breakin'''' plane)

Whiplash servos

Reply

Old 07-17-2003, 11:08 PM
  #1  
hooaa
Senior Member
Thread Starter
My Feedback: (1)
 
hooaa's Avatar
 
Join Date: Jun 2003
Location: Cambria, CA,
Posts: 199
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

I'm trying to decide which servos to buy for the Whiplash X. In the Hitec line is the HS-605BB, HS-625MG, or HS-645MG adequate? I'd prefer these over digitals for cost reasons, but if I must then so be it.
Please advise based on your experience.
hooaa is offline  
Reply With Quote
Old 07-18-2003, 12:29 AM
  #2  
ChuckAuger
Senior Member
My Feedback: (12)
 
Join Date: Dec 2001
Location: Pampa, TX
Posts: 5,133
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

hooaa, I use 8411's. On my first Whip (an early X model..had the elevons cut loose on the bottom) I needed them. I was running a 1000Mah pack and had to charge after each 2.5 min flight. After the crash, I checked the battery out and the foam it was wrapped in was melted to the strips connecting the cells, as well as the high point of each cell. That battery pack was getting extremely hot.

On my new Whip X I didn't use the stock elevons. I flew it 4 times on a 1600 Mah pack and the voltage was still above 5.2 volts.

If you use the stock elevons, get yourself some honkin servos and a good battery IMHO.
ChuckAuger is offline  
Reply With Quote
Old 07-18-2003, 12:36 AM
  #3  
RCLIVIN
Senior Member
My Feedback: (46)
 
Join Date: Mar 2002
Location: Rayne, LA
Posts: 722
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

I used hitec 5945 digitals, worked great, you need a lot of torque & very precise centering on a high speed plane like the whip or you will be flirting with disaster.

Gil
RCLIVIN is offline  
Reply With Quote
Old 07-18-2003, 01:23 AM
  #4  
sydclement
Senior Member
My Feedback: (1)
 
sydclement's Avatar
 
Join Date: Jan 2002
Location: Bridgeton, NJ
Posts: 146
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash Servos

Hooaa:
If you plan on going more than 150MPH you should stay
with a good metal gear digital servo such as the Hitec
5945 or JR 8411. The Whiplash is really flys smooth with
these or similar type servos. At these speeds you don't
need any hunting around neutral..

Syd
sydclement is offline  
Reply With Quote
Old 07-18-2003, 01:46 AM
  #5  
ChuckAuger
Senior Member
My Feedback: (12)
 
Join Date: Dec 2001
Location: Pampa, TX
Posts: 5,133
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

Syd, you tried any of the 5945's?? The 8411's have just a wee bit too much gear slop for me, but I don't know what else to try. TIA.
ChuckAuger is offline  
Reply With Quote
Old 07-18-2003, 01:49 AM
  #6  
hooaa
Senior Member
Thread Starter
My Feedback: (1)
 
hooaa's Avatar
 
Join Date: Jun 2003
Location: Cambria, CA,
Posts: 199
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

Thanks to all for the input. It seems clear from your comments that I need digital servos. The ones mentioned seem to average 150in/oz @4.8v. I will be using a Jett50 FIRE so I'd better not mince on the servos. Before I asked I was leaning toward HS-645MG with 107 in/oz @4.8v.
hooaa is offline  
Reply With Quote
Old 07-18-2003, 02:13 AM
  #7  
BAGOSTIX
Senior Member
My Feedback: (178)
 
BAGOSTIX's Avatar
 
Join Date: Dec 2001
Location: Lafayette, LA
Posts: 653
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default servos

hooaa the guys are 100% correct, at high speeds you need precision/torque/speed.. the faster you go, the less throw you need, I use HS5945s on my whiplash extreme and I have zero slop and very precise control...

The JR8411s are very good too but as mentioned, they have a little slop at neutral.

For the money the 5945s are just right...

The Hitec 645s would be fine too, just a little slower but still lots of torque..

I'd recommend the 5945s happy whippin
BAGOSTIX is offline  
Reply With Quote
Old 07-18-2003, 03:09 AM
  #8  
hooaa
Senior Member
Thread Starter
My Feedback: (1)
 
hooaa's Avatar
 
Join Date: Jun 2003
Location: Cambria, CA,
Posts: 199
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

Thanks Bagostix et al,
I've already found a 5945 source, no tax or shipping.
hooaa is offline  
Reply With Quote
Old 07-19-2003, 12:45 AM
  #9  
sydclement
Senior Member
My Feedback: (1)
 
sydclement's Avatar
 
Join Date: Jan 2002
Location: Bridgeton, NJ
Posts: 146
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Hitec 5945

Chuck:
I'm using 5945s in my new Whiplash and I have two
in my Magnum. They are tighter than the 8411s no doubt
about it..
Been turning the gear, that drives the output gear, half a turn,
this move the the worn spot away from center an makes the
8411s last longer before replacement.
Also tighten the case screws good and snug. That also helps...

Syd
sydclement is offline  
Reply With Quote
Old 07-19-2003, 12:46 AM
  #10  
sydclement
Senior Member
My Feedback: (1)
 
sydclement's Avatar
 
Join Date: Jan 2002
Location: Bridgeton, NJ
Posts: 146
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Hitec 5945

Chuck:
I'm using 5945s in my new Whiplash and I have two
in my Magnum. They are tighter than the 8411s no doubt
about it..
Been turning the gear, that drives the output gear, half a turn,
this move the the worn spot away from center an makes the
8411s last longer before replacement.
Also tighten the case screws good and snug. That helps...

Syd
sydclement is offline  
Reply With Quote
Old 07-19-2003, 01:05 AM
  #11  
ChuckAuger
Senior Member
My Feedback: (12)
 
Join Date: Dec 2001
Location: Pampa, TX
Posts: 5,133
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

Thanks Syd..The ones in this Whip have 4 flights and already have slop! They had a little bit when NIB, but it is noticeable now.

I'll try the gear rotation, if I can't get but 4 more flights, they are history.
ChuckAuger is offline  
Reply With Quote
Old 07-19-2003, 01:17 AM
  #12  
Rudeboy
 
Rudeboy's Avatar
 
Join Date: Dec 2002
Location: Kortessem, BELGIUM
Posts: 3,508
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

8411's get sloppy that fast???

I was reading on Bob Voiletts' website the other day, and he recommends these servos very highly...

I wouldn't want sloppy servos on a 10000$ jet plane...
Rudeboy is offline  
Reply With Quote
Old 07-19-2003, 10:56 PM
  #13  
LGM Graphix
My Feedback: (22)
 
LGM Graphix's Avatar
 
Join Date: Apr 2003
Location: Abbotsford, BC, CANADA
Posts: 5,554
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

Something to remember, in a high revving IC enginve vs a turbine.

There is no vibration in a turbine, therefore no high frequency wear causing vibration. The vibration caused by an IC engine spinning that fast will cause wear much quicker on everything. Look at how fast bolts loosen off in a ducted fan if you don't loctite everything. Same with a high RPM prop engine. That high frequency vibration is more damaging than you might thing.

Having said that


I just received my whiplash, will the JR8231 Digitals be a good choice? 88oz/in torque.

Also, is there anyway to loosen up the stiffness of the elevons in the whip?

And last, when the instructions read 5/16" throw up and down, is it 5/16" up, and 5/16" down, or 5/16" total. I made that mistake on my magnum and nearly killed it first flight.

Jeremy
LGM Graphix is online now  
Reply With Quote
Old 07-19-2003, 11:32 PM
  #14  
RCLIVIN
Senior Member
My Feedback: (46)
 
Join Date: Mar 2002
Location: Rayne, LA
Posts: 722
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

5/16" up & 5/16" down. As far as the servo I am not familiar with that servo but if you will be flying over 150 mph you may want more torque & metal gears & also digital for precise centering.

Gil
RCLIVIN is offline  
Reply With Quote
Old 07-19-2003, 11:37 PM
  #15  
ChuckAuger
Senior Member
My Feedback: (12)
 
Join Date: Dec 2001
Location: Pampa, TX
Posts: 5,133
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

I run about 1/2" up and down on low rates with 40% expo, just about 3/4" on high rates with 45% expo on the elevator and aileron. This is each direction. Quite a bit more than the instructions call for. I like to fly mine in high on elevator and low on ailerons.
ChuckAuger is offline  
Reply With Quote
Old 07-20-2003, 03:16 AM
  #16  
LGM Graphix
My Feedback: (22)
 
LGM Graphix's Avatar
 
Join Date: Apr 2003
Location: Abbotsford, BC, CANADA
Posts: 5,554
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

Originally posted by RCISMYLIFE
5/16" up & 5/16" down. As far as the servo I am not familiar with that servo but if you will be flying over 150 mph you may want more torque & metal gears & also digital for precise centering.

Gil

Well, it is Digital, i wouldn't put anything less than digital in something this fast. You don't feel 88oz will be enough? The instructions recommend 70 to 100, so the 88 is closer to the high side, it's just that I have a bunch of the 8231's from my Jets and they've never let me down in the jets.
LGM Graphix is online now  
Reply With Quote
Old 07-20-2003, 03:36 AM
  #17  
RCLIVIN
Senior Member
My Feedback: (46)
 
Join Date: Mar 2002
Location: Rayne, LA
Posts: 722
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

If they are metal gear I would try them, should be ok.

Gil
RCLIVIN is offline  
Reply With Quote
Old 07-20-2003, 03:43 AM
  #18  
ChuckAuger
Senior Member
My Feedback: (12)
 
Join Date: Dec 2001
Location: Pampa, TX
Posts: 5,133
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

I don't know...I hate to beat up the Whiplash elevons, but even on this new one they were dang stiff. I don't think 88oz-in would be enough to do much more than move them on the bench.

Read a few posts up where I describe the melted foam on my battery pack. This wasn't from going fast...the plane had only (6) flights, (5) of them about 2 1/2 minutes, one about 30 seconds. 13 minutes total time and the foam was melted to the battery. This was from the servos fighting the elevons.

The second one is set up identically to the first except for the elevons and a 1600Mah battery vs a 1000Mah. The first one HAD to be re-charged after every 2 1/2 minute flight. The second one has 4 flights of 2 1/2 minutes and still (a week later) reads 5.2 volts.

I wouldn't put it into the air with anything less than 150oz-in or so elevon servos if using the stock elevons.

Grab the tip of the elevon and make sure it doesn't move up/down at the hinge line, at the tip...this is what killed my first one, and is why I replaced the elevons on the second. If the top hinge laminate loosens up where it will move up/down just a little, there is nothing to stop it from fluttering.

You might read a few posts from guys who used the 5/16" Up/Down travel and lost their plane to a dead stick situation from not having enough elevator to flair, or just going in from lack of elevator response. 5/16" might work fine for some, I like the 1/2" minimum. Even on low rate elevator I can glide in with total control.
ChuckAuger is offline  
Reply With Quote
Old 07-20-2003, 04:10 AM
  #19  
LGM Graphix
My Feedback: (22)
 
LGM Graphix's Avatar
 
Join Date: Apr 2003
Location: Abbotsford, BC, CANADA
Posts: 5,554
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

Chuck, what did you do to the elevons on your new one to keep them from coming apart again?
LGM Graphix is online now  
Reply With Quote
Old 07-20-2003, 05:45 AM
  #20  
ChuckAuger
Senior Member
My Feedback: (12)
 
Join Date: Dec 2001
Location: Pampa, TX
Posts: 5,133
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

I put different elevons on it. Too much to go into here, PM me if you want all the details (lots of details, not for the faint of heart).
ChuckAuger is offline  
Reply With Quote
Old 07-20-2003, 10:12 PM
  #21  
LGM Graphix
My Feedback: (22)
 
LGM Graphix's Avatar
 
Join Date: Apr 2003
Location: Abbotsford, BC, CANADA
Posts: 5,554
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

Originally posted by ChuckAuger
I put different elevons on it. Too much to go into here, PM me if you want all the details (lots of details, not for the faint of heart).
Thanks Chuck, I modded mine today It should work dandy fine

My Whiplash mod]
LGM Graphix is online now  
Reply With Quote
Old 07-23-2003, 04:50 PM
  #22  
hooaa
Senior Member
Thread Starter
My Feedback: (1)
 
hooaa's Avatar
 
Join Date: Jun 2003
Location: Cambria, CA,
Posts: 199
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

I notice Hitec makes HS-5645MG. At $55 ea. they are $35 less than 5945. Torque 143@4.8v. Anybody tried these?
hooaa is offline  
Reply With Quote
Old 07-23-2003, 06:24 PM
  #23  
BAGOSTIX
Senior Member
My Feedback: (178)
 
BAGOSTIX's Avatar
 
Join Date: Dec 2001
Location: Lafayette, LA
Posts: 653
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default hitec

Very good servo, it would work fine, I used some of these in a turbine jet.
BAGOSTIX is offline  
Reply With Quote
Old 07-23-2003, 06:41 PM
  #24  
hooaa
Senior Member
Thread Starter
My Feedback: (1)
 
hooaa's Avatar
 
Join Date: Jun 2003
Location: Cambria, CA,
Posts: 199
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default Whiplash servos

Your acceptance is good enough for me. I note that at 4.8v the response time is .23s/60deg no load vs. .16s for the 5945's. In practice I suspect the 70 millisecond difference is not perceivable.
hooaa is offline  
Reply With Quote
Old 07-23-2003, 07:18 PM
  #25  
BAGOSTIX
Senior Member
My Feedback: (178)
 
BAGOSTIX's Avatar
 
Join Date: Dec 2001
Location: Lafayette, LA
Posts: 653
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default better

The faster the better on servo speed... but the whiplash wont care unless you're inverted 2 inches off the deck and need to change from pulling up elevator to down elevator before hitting the deck...
BAGOSTIX is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service