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F-27 Stryker

Old 09-19-2005, 03:54 AM
  #76  
flyingroadie
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Thanks so much for the info once again. Funny how the UBEC from Hobby-Lobby is right up the street from me (40 miles anyway). Appreciate the hook up



-Where am I today?
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Old 10-03-2005, 09:48 AM
  #77  
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Originally Posted by Glacier Girl
The CC35 is not rated for use with a 4s pack. Look here for more info. http://www.hobby-lobby.com/ubec.htm
Is the CC45 rated for use with a 4S pack?
Eric
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Old 10-03-2005, 11:31 AM
  #78  
Glacier Girl
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Eric,
The standard 45 is not, the HV45 is good for up to 12s lipo/or 36 reg cells.
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Old 10-03-2005, 06:22 PM
  #79  
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SINCE THIS IS YOUR THREAD, ILL ASK YOU THE QUESTIONS. I AM GETTING THE PARTS FOR A STRYKER AS I HAVE A BP21 AND 18 AMP ESC HANDY PLUS A 3S 1800 AND 2100 LIPO. DONT WANT A SUPER FAST SO WHAT PROP WILL NOT HURT THE SETUP BUT GET GOOD PERFORMANCE? need an easy launch as old arms and shoulders dont through pitch the javilin anymore
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Old 10-03-2005, 09:45 PM
  #80  
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Originally Posted by foamybill
SINCE THIS IS YOUR THREAD, ILL ASK YOU THE QUESTIONS. I AM GETTING THE PARTS FOR A STRYKER AS I HAVE A BP21 AND 18 AMP ESC HANDY PLUS A 3S 1800 AND 2100 LIPO. DONT WANT A SUPER FAST SO WHAT PROP WILL NOT HURT THE SETUP BUT GET GOOD PERFORMANCE? need an easy launch as old arms and shoulders dont through pitch the javilin anymore
I believe the 7x6 so far has done about the best with the BP.
At least that's what my chums on the other side of the pond are using.
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Old 10-03-2005, 10:49 PM
  #81  
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Thanks Gg. Will Try That When Im Ready.
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Old 10-07-2005, 12:41 PM
  #82  
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Originally Posted by Glacier Girl
I believe the 7x6 so far has done about the best with the BP.
At least that's what my chums on the other side of the pond are using.
Yep, that's it! Great job, GG, being this is your thread!
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Old 10-07-2005, 01:03 PM
  #83  
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Hey,
What's mine is yours. Share the wealth........ Knowledge that is, don't ask for money.
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Old 10-07-2005, 03:40 PM
  #84  
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Originally Posted by Glacier Girl
Hey,
What's mine is yours. Share the wealth........ Knowledge that is, don't ask for money.
Hey, I think they have found natural gas on our land and the land surrounding us that is finally cost effective to retrieve! That would be great and I would send you $10 bucks and a new Stryker and myself ten if it pans out!

O.K., you can share the thread.
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Old 10-10-2005, 03:03 AM
  #85  
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Originally Posted by Glacier Girl
Eric,
The standard 45 is not, the HV45 is good for up to 12s lipo/or 36 reg cells.
The product insert says up to 12 cells (NiMH or NiCD) with 3 standard micro servos. (Using just 2 servos gains us a little more leeway.) Wouldn't 12 NiCD be the equivalent of 4 Lipos. NiCD cells are 1.2 Volts/cell (ranging from 1.0-1.4 volts/cell). Lipo cells are 3.7volts/cell (ranging from 3.0-4.2 volts/cell). 12 cell NiCD would be 14.4volts (12-16.8volts). 4S Lipo would be 14.8volts (12-16.8 volts). Am I missing something here?

It does seem that 4S lipos always charge up to 16.8 volts, but 12 cell NiMH generally only charge up to 14.4volts. But I seem to remember that NiCD charge up a little higher than NiMH.
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Old 10-10-2005, 03:44 AM
  #86  
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Default Stryker Crazy

Hi guys! I put together a Stryker with sign foam elevons, and originally dropped a GWS EDF64 with an E-Flite Park 400 4200kv pulling 18 amps WOT with a Coca-Cola 20 oz bottle thrust tube on it, and powered by a TP 3s 2100. It definitely topped the charts on the WOW-factor, but only performed moderately better than a stock Stryker. I had the opportunity recently to see a Stryker fitted with a Mega 16/15/4, a 6x4 APC-E, and a TP 3s 2100, and I watched it keep pace with a Great Planes Combat Corsair .15-.25 glow, fitted with a .32 OS. Talk about WOW! So I refitted my Stryker with an AON 28xx-3000kv and a 5x5 APC-E using the same TP 3s 2100. After I test fly it, I'll let y'all know how it is. Later ... Dave
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Old 10-10-2005, 06:33 AM
  #87  
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Default 3000KV motor

I have a Himax 2815/3000 in my stryker. I fly it with a 5X3 ACP. But tomorrow I'm going to try a 5X4 Cox prop just for grins. My AMP meter says it is at 25 AMPs and 248 watts with the 5X4. The 5X3 pulls 22 AMPs at about 214 watts. Just FYI. I'll maiden with the 5X4 tomorrow AM.

CTD

Originally Posted by drensa
Hi guys! I put together a Stryker with sign foam elevons, and originally dropped a GWS EDF64 with an E-Flite Park 400 4200kv pulling 18 amps WOT with a Coca-Cola 20 oz bottle thrust tube on it, and powered by a TP 3s 2100. It definitely topped the charts on the WOW-factor, but only performed moderately better than a stock Stryker. I had the opportunity recently to see a Stryker fitted with a Mega 16/15/4, a 6x4 APC-E, and a TP 3s 2100, and I watched it keep pace with a Great Planes Combat Corsair .15-.25 glow, fitted with a .32 OS. Talk about WOW! So I refitted my Stryker with an AON 28xx-3000kv and a 5x5 APC-E using the same TP 3s 2100. After I test fly it, I'll let y'all know how it is. Later ... Dave
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Old 10-10-2005, 10:51 AM
  #88  
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Originally Posted by erashby
The product insert says up to 12 cells (NiMH or NiCD) with 3 standard micro servos. (Using just 2 servos gains us a little more leeway.) Wouldn't 12 NiCD be the equivalent of 4 Lipos. NiCD cells are 1.2 Volts/cell (ranging from 1.0-1.4 volts/cell). Lipo cells are 3.7volts/cell (ranging from 3.0-4.2 volts/cell). 12 cell NiCD would be 14.4volts (12-16.8volts). 4S Lipo would be 14.8volts (12-16.8 volts). Am I missing something here?

It does seem that 4S lipos always charge up to 16.8 volts, but 12 cell NiMH generally only charge up to 14.4volts. But I seem to remember that NiCD charge up a little higher than NiMH.
I asked Joe at Castle, this same question, answer was still no.
They do not recommend it.
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Old 10-11-2005, 04:16 AM
  #89  
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Originally Posted by Glacier Girl View Post
I asked Joe at Castle, this same question, answer was still no.
They do not recommend it.
I understand the answer, but just not the reason. If 4S lipo is the equivalent of 12 cells of NiCD, then why would 4S lipo not be recommended but 12 cell NiCD would be okay. Castle Creations has not updated their "Instructions" with the recommended number of Lipo cells, even in their "Auto Lipo User" version of the Instructions, very interesting. Don't get me wrong I like their ESCs and own 5 of them. And their service is first rate. I think that their BEC circuits may be a weak spot on their ESCs (as they are on most ESCs). I'm just trying to understand...if the ESC just sees volts and amps it doesn't know if you have NiCds or Lipos, so how can 12cells NiCD be recommended and 4S lipo not?
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Old 10-11-2005, 10:40 AM
  #90  
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Maybe the best way to get an answer is to call Castle.
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Old 10-11-2005, 12:40 PM
  #91  
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It might have something to do with voltage depression. Nicads and Nimh batteries don't hold their voltage under load the way a modern lipo does. It the work of stepping down the voltage that causes the bec chip in the speed control to heat up.

John
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Old 10-12-2005, 12:10 AM
  #92  
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Originally Posted by erashby View Post
I understand the answer, but just not the reason. If 4S lipo is the equivalent of 12 cells of NiCD, then why would 4S lipo not be recommended but 12 cell NiCD would be okay. Castle Creations has not updated their "Instructions" with the recommended number of Lipo cells, even in their "Auto Lipo User" version of the Instructions, very interesting. Don't get me wrong I like their ESCs and own 5 of them. And their service is first rate. I think that their BEC circuits may be a weak spot on their ESCs (as they are on most ESCs). I'm just trying to understand...if the ESC just sees volts and amps it doesn't know if you have NiCds or Lipos, so how can 12cells NiCD be recommended and 4S lipo not?
I think you answered your own question when you added the voltage of 4 lipo cells fully charged at 16.8 v. NiCds and NiMHs start loosing voltage immediately and do not stay at their high voltage for more than a few seconds. LiPos will at and above 14volts a lot longer. I know it is ONLY a little more voltage, but, it holds it longer and you can't expect them to RECOMMEND something that goes above their recommended TOP limit. You could always try it yourself. Might cost you an ESC. Actually, that is how a lot of us discover new things to use. You just have to be willing to accept the destruction of your device and not blame the company.
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Old 10-12-2005, 01:10 AM
  #93  
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Hey while we are speaking of lipos. I'm announcing my withdrawl of recommending PolyQuest lipos.
From my "contact" in the business, PQ just dumped their US suppliers and went behind their backs to sign an exclusive with Hobby Lobby.
Not good business. (my opinion)
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Old 10-12-2005, 10:16 PM
  #94  
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Default IS Mega 16/15/4 the BEst ? Can it do unlimited Vertical ??

Hello,

I am in france,and I JUST bought a Stryker components kits, a Mega 16/15/4, a 25a ESC....

1 - I was wondering what should be the final weight of the plane, with 3s 2100 mA battery.

2 - With the Mega 16/15/4 and a APCe 6x4, will it be able to go "unlimited vertical" ?

3 - With the 16/15/4, has someone tried other props than the 6x4 like a 7x5 ? Or tried... 4 LiPos on the 16/15/4 ?

4 - Some people are trying to convince me to use a MEGA 16/25/4 with 4 LiPos and a 8x8 or 7x7 prop like they do ! Do you believe that it will be usefull or that the weight increase will waste all the extra power.

5 - CAn a Mega 16/15/5 with 4 lipos be a good alternative without the extra weight of the 16/25/4 ?



Many thanks for your help. I know I bought the right plane, but I am not sure about the motor (I prefer to have high speed & vertical performances rather than very-very-very high speed !! )


PS : Can you guys post pictures of your painting ?
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Old 10-13-2005, 05:47 AM
  #95  
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Default Mega motor

The mega has been the motor that everyone has been running, mostly. I can't comment on the other Mega motors, maybe others here can. The mega is awsome!! I run a Himax 2815/2000, it's almost just like the 16-15-4. I have been very happy with it. I think the mega will work very well for you, It will provide lots of speed and verticle performance. I believe you can also run 4s on that motor if you need more. I'll post a pictures of my strykers. Good luck, you are going to love this plane. It does it all, fast, slow what ever you want. I don't have a scale for the weight, It will fly with a brick on board. Weight isn't a hugh issue with Bl motor and Lipos. When I made my 1st Stryker 1 year ago, I didn't have any lipos. I ran it with a 8 cell 2000Mah 4/5 sub c pack!!!! That pack weight was 14.5 oz and she flew. This plane is AWSOME, enjoy it and keep asking questions.

CTD
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Old 10-13-2005, 11:24 AM
  #96  
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The 16/15/4 is high speed low torque. Small prop at high speed.
The 16/25/4 is high torque low speed. Bigger prop slower speed.
So for speed go with the 15, for torque/thrust go with the 25.
But that's where packs come in. I run the 16/25/4 on 4s power.
APC 8x6 gasser prop, thrust is in the 50 oz range and speed is right at 100mph. Slap on a Graupner Cam Speed 7x7 and speed runs well in excess of 100mph. Unlimited vertical,with the 8x6, my favorite stunt is a screaming flyby at 6 feet off the ground, then pull into a rolling vertical till it's out of sight. Pull back the throttle and play "Where the heck did it go" game. Plese note 2 things: 4s power will be more then the Esc will handle amp and voltage wise. You need to use a Ubec(stand alone) and a 35 amp esc. My versions come out around 30 oz ready to fly.
Go here for some pics of my birds. http://www.rcuniverse.com/gallery/ga...m?memID=115665
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Old 10-13-2005, 11:41 AM
  #97  
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Thanks for the answers.

Glacier Girl, this 6s LiPos Stryker seems insane ! This is a crazy bird !!! :-)
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Old 10-13-2005, 12:16 PM
  #98  
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Default What "Hard" finist to protect the plane ? WBPU ?

I read on http://www.modelflight.com.au/hobby...ker_upgrade.htm

"As a second experiment, I chose to cover the whole plane in fabric and Water Based Polyurethane floor polish (WBPU)....I first covered the bottom with one whole piece of black organza dress fabric, allowing the WBPU to dry for 2 hours ....5 Coats later I had a hard ding proof covering on the plane. ".

--> What is this WBPU covering ? What is this "orgabza dress fabric" ?

--> Where can I find them ?

--> Will it add a lot of weight ?


How have you finished your plane to make it stronger and nicer ?
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Old 10-13-2005, 01:55 PM
  #99  
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Hey, I answered that one for you at E-zone.
But for the newbies, here you go.
WBPU is short for Water Based PolyUrethane. Over here it's a product called MinWax. It's a polyurethane coating for wood. Dries to a hard finish.
It's used in place of fiberglass resin. Lighter weight, and easy clean up.
Can also be mixed with micro ballons, or baby powder to use as a filler.
The dress fabric, is just the poor mans version of fiberglass cloth.
Some even use nylon stocking material. All in the way of reducing weight.
Glassing a bird does make it stronger, and yes it does add weight.
It's one of those compromises you have to decide on. It's a stonger bird, but is slower because of the weight. Or, you go the route I did on my glassed version, went with a much larger motor/prop combo to handle the extra weight.
One other benefit of glassing, super smooth finishes, which reduce drag.
Take a look at this pic. Notice the reflection in the paint, smooth, no bumps from the foam.
And yes this is a Stryker.
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Old 10-16-2005, 07:50 AM
  #100  
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O.K, most of you guys tell how much you can buy them for, but where do you buy the f-27 strykers at?
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