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ESM LA-7 From VQ Warbirds

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Old 04-26-2010, 08:14 PM
  #176
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Quote:
ORIGINAL: fw190

Looks like a soft cutoff as you still had idle. When I flew my Heli with A123s I just removed the cutoff voltage and timed my flight. A123s are good , will you be able to incorporate 10s2p on the LA7?
can't go 10S2P since that will go over the 50v ESC limit but I could do 14S. I will see what kind of performance I get before moving to four more cells. I don't think I "over-amp'd" the ESC as the watt meter shows 45 amps at full throttle...this is an 85HV ESC. I am not sure why it cut out at the field but on two sunsequent runs when I got home, I had no issues at all. Now, I need to get a spinner from Tomas. I sent him an email but no answer
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Old 04-28-2010, 04:46 PM
  #177
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Default RE: ESM LA-7 From VQ Warbirds


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ORIGINAL: LA7flier


Quote:
ORIGINAL: fw190

Looks like a soft cutoff as you still had idle. When I flew my Heli with A123s I just removed the cutoff voltage and timed my flight. A123s are good , will you be able to incorporate 10s2p on the LA7?
can't go 10S2P since that will go over the 50v ESC limit but I could do 14S. I will see what kind of performance I get before moving to four more cells. I don't think I ''over-amp'd'' the ESC as the watt meter shows 45 amps at full throttle...this is an 85HV ESC. I am not sure why it cut out at the field but on two sunsequent runs when I got home, I had no issues at all. Now, I need to get a spinner from Tomas. I sent him an email but no answer
After thinking about it over the past day or so, I am pretty certain that I pulled at least one cell below the de-fault 3.0v/cell that the ESC comes programmed with. Once I re-programmed the LVC to 2.4v/cell, the throttle issue went away. I will plan to fly it again this Saturday (if I get my spinner in time)
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Old 04-28-2010, 06:37 PM
  #178
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Default RE: ESM LA-7 From VQ Warbirds

I am not talking about increasing the voltage, just wondering if you can double the flight pack capacity. With parallel packs you will get less heat off the packs as they work together with the current draw better yet double your flight time.
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Old 04-29-2010, 02:14 AM
  #179
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Default RE: ESM LA-7 From VQ Warbirds

You can go 10s 2p but run then in pararellel. Not in series. It will give you the same voltage but twice the run time. That is what I did on my Wellington.

If you would just up your cells by 2 you would see a hugh difference in your power...
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Old 05-06-2010, 01:34 AM
  #180
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Default RE: ESM LA-7 From VQ Warbirds

This is my solution for an pneumatic retractable tailwheel. Tailwheel and airram is available at Hobby City.
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Old 05-06-2010, 11:36 AM
  #181
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Default RE: ESM LA-7 From VQ Warbirds

I have the same wheel in mine. Works fine, but doesn't retract all the way up on mine. Still looks great.


Jeff
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Old 05-11-2010, 07:31 PM
  #182
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I just messed up the right wing wheel well liner trimmed it too close to the opening. I can probably repair the gaps with ply or flightskin, but would really like to have a second shot with a new liner. Does anyone have a liner that they aren't going to use? Please email me at dangellner@msn.com maybe we can make a deal. Thanks...
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Old 05-11-2010, 09:09 PM
  #183
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Which side do you need?? I may be able to make a quick mold and get you one out this weekend.. It would be pulled in .040 ABS. If you don't have someone step up with one for you..

Ty
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Old 05-13-2010, 04:08 PM
  #184
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Default RE: ESM LA-7 From VQ Warbirds

Thanks Ty,

I was able to make my mistake work. It will take a little bit of hole filling with a couple little pieces of Flightskin, but will work and look fine. Good thing it is on the bottom of the wing so I don't have to look at it all the time. The retracts drop into this thing like nothing. Has anyone had any issues with the rails not holding well. I did have to put a couple of spacers in the leading edge side of the rail to level it up but it doesn't seem like there is much that the mounting screws are going into. Which is fine because I plan to grease the landing every single time.
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Old 05-13-2010, 07:46 PM
  #185
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Default RE: ESM LA-7 From VQ Warbirds

Mr Dang Elner! You better finish that LA-7 so you can fly it at Castle event, its coming soon.
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Old 05-24-2010, 04:29 PM
  #186
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Default RE: ESM LA-7 From VQ Warbirds

If anyone is interested, I bought the ESM retract set for the LA-7. Since then, Bruce at CJM made me a set for my ESM LA-7. I intend to keep the wheels and I would like to sell just the retracts and air kit if someone would like to have a set or an extra set. Contact me if interested.
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Old 06-20-2010, 04:47 PM
  #187
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Default RE: ESM LA-7 From VQ Warbirds


Quote:
ORIGINAL: fockewulf37

You can go 10s 2p but run then in pararellel. Not in series. It will give you the same voltage but twice the run time. That is what I did on my Wellington.

If you would just up your cells by 2 you would see a hugh difference in your power...
Well, I have gone to a 14S A123 setup....you're right! Scary more power. I put the watt meter on it and stopped adding throttle when the watts read 2400 and the prop tips started ripping the air. I'm running a 20x10 APC E prop. The Phoenix 80 HV controller should be able to handle this power load (barely). If I had it to do over again, I would replace the 80HV with a 120HV unit for plenty of buffer! Can't wait to see what this makes the plane do in the air...vertical should be a piece of cake.
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Old 06-21-2010, 01:16 AM
  #188
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Default RE: ESM LA-7 From VQ Warbirds

Having more cell count (higher voltage) would require less amp for the same needed result you had with 10s. The 80HV will run cooler than before.
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Old 06-21-2010, 05:36 AM
  #189
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ORIGINAL: fw190

Having more cell count (higher voltage) would require less amp for the same needed result you had with 10s. The 80HV will run cooler than before.
yup, you are right! This is still new to me but I'm learning. I did the calcs and find that the 2300 mAh packs put out 69 amps. 14S yields 46.2 volts(loaded). total watts equals 3188 which is equal to 4.25hp on a 14 pound airframe!! That assumes I did the math correctly...this should be fun
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Old 06-21-2010, 12:06 PM
  #190
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Default RE: ESM LA-7 From VQ Warbirds

I am no expert but have gone through it with my 3D helis. Higher voltage can mean higher efficiency while extending the life of your batteries. How many minutes of flight time are you getting on the A123? I ran a 10sA123 on a heli and I get around 4 min max at full power, drawing 2200 from the packs. A123s are great but Lipo is still king when it comes to power and weight. I rebuilt all my A123s to RX packs and they are working great on my warbirds.
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Old 06-21-2010, 01:18 PM
  #191
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Default RE: ESM LA-7 From VQ Warbirds


Quote:
ORIGINAL: fw190

I am no expert but have gone through it with my 3D helis. Higher voltage can mean higher efficiency while extending the life of your batteries. How many minutes of flight time are you getting on the A123? I ran a 10sA123 on a heli and I get around 4 min max at full power, drawing 2200 from the packs. A123s are great but Lipo is still king when it comes to power and weight. I rebuilt all my A123s to RX packs and they are working great on my warbirds.
with throttle management, I can squeeze about 6 minutes tops... but you can bet the plane is circling the field when I am that far out on the timer.

I understand about the Lipo's. I didn't want to worry about the over-charge, discharge, volatility and generally slow recharge times. Plus, I would have to design an easy-to-access hatch for removal of Lipo packs and I would have to haul around several packs to get several flights in at the field without burning up the entire day. The A123's allow me to re-charge the packs in the plane over the course of about 35 minutes so I can get a couple of flights every hour. I usually don't fly more than a couple of hours anyway so four flights works just fine for me.
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Old 06-22-2010, 08:22 PM
  #192
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Any opinions on a ZDZ 40 rear exhaust for this plane. Thanks
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Old 06-24-2010, 01:26 AM
  #193
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Default RE: ESM LA-7 From VQ Warbirds

My LA-7 has arrived today. I plan on fitting Ty's spinner and cockpit along with a gas engine. The engine hasn't been chosen yet (plenty of time to save for that) but I would appreciate any suggestions from those running gasser engines.
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Old 06-24-2010, 04:34 AM
  #194
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Default RE: ESM LA-7 From VQ Warbirds

Raven good to see they have finally arrived in oz ! cant wait to seeone in the air
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Old 06-24-2010, 06:53 PM
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Default RE: ESM LA-7 From VQ Warbirds


Quote:
ORIGINAL: The Raven

My LA-7 has arrived today. I plan on fitting Ty's spinner and cockpit along with a gas engine. The engine hasn't been chosen yet (plenty of time to save for that) but I would appreciate any suggestions from those running gasser engines.
I too look forward to a report from someone flying a gasser in this plane. My experience (when doing a wing repair) is that the structure is extremely light and easy to break the glue bonds. I wonder what the vibration would do??
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Old 06-24-2010, 08:45 PM
  #196
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Default RE: ESM LA-7 From VQ Warbirds


Quote:
ORIGINAL: LA7flier


Quote:
ORIGINAL: The Raven

My LA-7 has arrived today. I plan on fitting Ty's spinner and cockpit along with a gas engine. The engine hasn't been chosen yet (plenty of time to save for that) but I would appreciate any suggestions from those running gasser engines.
I too look forward to a report from someone flying a gasser in this plane. My experience (when doing a wing repair) is that the structure is extremely light and easy to break the glue bonds. I wonder what the vibration would do??
I'm still considering power plants.

Last night a friend suggested that I should use the 1.80 four stroke I have sitting in a box. It makes sense to use what I have (save some dollars) and the kit does specify a 1.80. Has anyone tried this engine combo before?
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Old 06-24-2010, 09:25 PM
  #197
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Default RE: ESM LA-7 From VQ Warbirds

When I can ever get to mine...I have a OS 1.60 2-stroke on CH ignition for mine. 3.7hp baby...it should move out. My 80" World Models P-51 had the same setup and it was clocked at 82mph, so it should be perfect in this.
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Old 06-24-2010, 09:46 PM
  #198
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My other (off the shelf) engine choice is a YS120NC. While it may not be quite the thumper a 1.80 should be, do you think it'll be enough?
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Old 06-24-2010, 11:38 PM
  #199
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Raven,
I think that would be a marginal choice. Stick with the 180 at least.
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Old 06-25-2010, 09:21 PM
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Default RE: ESM LA-7 From VQ Warbirds

Here's another LA-7...
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