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RC Lander 70mm F9F Panther thread

Old 12-30-2008, 11:00 PM
  #26  
Don Sims
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Looking good Mike, just don't use too much go juice before that maiden!
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Old 01-04-2009, 02:42 PM
  #27  
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It's getting closer. Just a few minor things to button up and she's ready for the skies.

The nose cone is put on temporarilly. I received the wrong one with my plane. The new one is being shipped from EJF. It has the red nose as in my original pictures in this thread.
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Old 01-04-2009, 03:03 PM
  #28  
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Tom, how much time do you have in it so far?
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Old 01-04-2009, 03:08 PM
  #29  
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I'm not sure Don. I would guess a good 15 to 20 hours. There are a few things that I wasn't totally happy with the way they were done at the fatory so I had to rework them. I still need to make new wheel covers for it. Since I took out the retracts that came with it, it will need new covers and some work around the wheel wells to clean it up.
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Old 01-04-2009, 06:22 PM
  #30  
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I am working now on my Panther and have some confusion about the installation of the EDF unit.
Does the EDF unit just sit on the grooves in the fuselage and then fastened by the cover, or I have to bolt the unit to the fuselage before closing the cover.
Appreciate your help.
Yigal
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Old 01-05-2009, 02:55 AM
  #31  
gr8taz nitro
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It's lookin good. Have you run up the motor yet to see what kinda numbers your gettin? I'm still kickin around the idea of pullin the beast and putting another ammo inplace of.
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Old 01-05-2009, 03:04 AM
  #32  
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Originally Posted by yflint View Post
I am working now on my Panther and have some confusion about the installation of the EDF unit.
Does the EDF unit just sit on the grooves in the fuselage and then fastened by the cover, or I have to bolt the unit to the fuselage before closing the cover.
Appreciate your help.
Yigal
I put a couple of spots of hot glue on the outside of the fan housing then clamped it in with the fan cover. Seems to hold fine. If yours has tabs on the fan housing, it should stay in place without the glue.

Originally Posted by gr8taz nitro View Post
It's lookin good. Have you run up the motor yet to see what kinda numbers your gettin? I'm still kickin around the idea of pullin the beast and putting another ammo inplace of.
Yes, I'm a little concerned with the numbers. On freshly charged packs, these are the numbers I'm getting. I'm concerned the voltage is dropping off too fast.

Resting volts before sart up: 16.71

After 20 seconds running:
Amps 40
Watts: 560
Volts: 13.82
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Old 01-05-2009, 03:59 AM
  #33  
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Originally Posted by Grasshopper View Post
I put a couple of spots of hot glue on the outside of the fan housing then clamped it in with the fan cover. Seems to hold fine. If yours has tabs on the fan housing, it should stay in place without the glue.



Yes, I'm a little concerned with the numbers. On freshly charged packs, these are the numbers I'm getting. I'm concerned the voltage is dropping off too fast.

Resting volts before sart up: 16.71

After 20 seconds running:
Amps 40
Watts: 560
Volts: 13.82
What size and C rate are those packs?
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Old 01-05-2009, 04:20 AM
  #34  
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Originally Posted by Larry3215 View Post
What size and C rate are those packs?
I've got two packs of 2S1P 4350 mAh 25C in series. To make a 4S 4350 25C pack.
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Old 01-05-2009, 05:52 AM
  #35  
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Something seems wrong then. Your only pulling 10C on those packs and yet the voltage is dropping pretty far down early in the run for that lite a load.

You might check your connectors and see if you have a bad connection somewhere causing a higher than normal resistance. That can limit the current flow and cause excess voltage drop.

I would have expected much better performance from those packs.
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Old 01-05-2009, 03:08 PM
  #36  
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Originally Posted by Larry3215 View Post
Something seems wrong then. Your only pulling 10C on those packs and yet the voltage is dropping pretty far down early in the run for that lite a load.

You might check your connectors and see if you have a bad connection somewhere causing a higher than normal resistance. That can limit the current flow and cause excess voltage drop.

I would have expected much better performance from those packs.
Me too Larry. I'm using 6mm bullet connectors but I think I might change them. They're a real pain to connect and disconnect.
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Old 01-05-2009, 05:29 PM
  #37  
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40 amps for 20 seconds shouldn't be dropping your voltage that low. My beast is dropping my pack to around those voltage numbers but it's under 91 amps to do that.

Are the connectors getting warm? If they are I might be able to see that kind of performance, but 25c packs in that size you should be mid to upper 50's and putting about 800+ watts into that motor without any trouble if the packs are holding, which it doesn't look like they are.
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Old 01-11-2009, 01:28 AM
  #38  
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Ordered some new 4S packs for the Panther. gr8taz nitro and I went in together on an order from Hobby City for 8 of these.

http://www.hobbycity.com/hobbycity/s...00mAh_4S1P_20C

Hopefully two of these in parallel will give it a little more umph.
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Old 01-11-2009, 01:01 PM
  #39  
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I'm using those in (whats left of) my ET F-22. They made a huge difference in the flights, very nice improvements and seem like a great battery for the price even before it went in.
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Old 01-11-2009, 01:16 PM
  #40  
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That's good to know Don. For only $28 each delivered via express, we had to give them a try.
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Old 01-11-2009, 02:54 PM
  #41  
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Tom:
Have you flown yours yet? I got tired of messing with the retracts and pulled them. Today hand launch. Mine flies pretty good but airspeed is everthing on this EDF. It flies totaly different then my F-18 and F-16. I'll post my results later. Mike
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Old 01-11-2009, 03:06 PM
  #42  
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Hi Mike,

I haven't done anything with mine for the past week. I'm waiting for my new batteries to arrive (should be early this week) along with the correct nose cone from EJF.

I need to clean up the area around the wheel wells where I pulled the gear and doors so it looks presentable then she's pretty much ready to go. I think I'll also give the bottom a few coats of wbpu to help keep it clean since I'll be belly landing it. Weather hasn't been very good here lately either. Cold and windy.
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Old 01-11-2009, 08:53 PM
  #43  
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I think there is a confusion on what battery to use. I got with the kit the EDF unit having a motor with 3900 KV. On the technical data stated on the box it say to use a 4S battery but on the manual it is stated to use a 3S battery.
I asked the supplier to clarify that issue. He replied that the unit marked DF68-1AP39 with 3900 KV was originally for 3S only, but on about last September they issued an upgraded unit that work also with 4S , but, ther is no marking that will enable us to know which unit is the old one and which is the new one.
I asked Lander for explanation but still waiting for the reply.
I shall appreciate if anyone can tell me what he is using .

Y. Flint
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Old 01-12-2009, 12:21 AM
  #44  
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Wow 4 flights on the Panther today. Fun is not the word, and launch no problem. This thing moves out. Mike
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Old 01-14-2009, 01:50 PM
  #45  
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Anybody flying? I'm building a bungee launcher today. I'm too old for this running and tossing stuff. Mike
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Old 01-14-2009, 02:00 PM
  #46  
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The Panther looks great in the air Mike. My nose cone and touch up paint should be here next week. My new batteries arrived yesterday so I'm getting closer.
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Old 01-14-2009, 02:17 PM
  #47  
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Great to hear. Just be sure and get that CG right and get someone who can really toss that thing. It needs airspeed to get going but slows down really nice for landings. I'm at 70mm and its a tad nose heavy but flies great there. It really groves in flight. Mike
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Old 01-14-2009, 02:27 PM
  #48  
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I've got the CG set at 70mm. I'd rather be a tad nose heavy as well. I've already got my launcher (read friend) ready to toss it for me. I just need to get it finished up and then have some decent weather. It's been really windy here lately and supposed to be in the single digits tonight.
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Old 01-17-2009, 01:49 PM
  #49  
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Finished up my launcher yesterday. I'll post a few pictures of it and let you know how its works after I use it tommorow. IMike
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Old 01-17-2009, 02:02 PM
  #50  
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Cool. Our club is looking at building a portable launcher. The EDF population is growing.
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