RE: Top Flite Giant P-51 Conversion

RE: Top Flite Giant P-51 Conversion
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RE: Top Flite Giant P-51 Conversion - 9/20/2005 12:48 PM

Darrell B.

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Tweet,

The wind at our field was swirling at 15 to 25 and mostly cross winds. If it had been straight down the runway it would have been a go.
My other problem is that I keep getting only intermittent good range checks. I have a Futaba 9001 servo that wants to buz a lot, and my S-bec battery eliminator for my flight pack seem to be causing RF interfearance when it warms up. It will start out and range check just fine, but then the range starts to diminish. It will range check ok with a regular 4 cell receiver pack. I need to get a 5 cell and just use it.
Does anyone have any suggestions on any of these issues/problems/opportunities?

I really want to fly this airplane before winter!!!

Thanks,
Darrell

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RE: Top Flite Giant P-51 Conversion - 9/20/2005 12:56 PM

red_z06

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I've never used S BECs.

I've been using UBEC from koolflight with 6V 3A specs with good results.
I've picked up few 6V 3.5A 45V input switching regulators at the NEAT Fair. I'll let you know how it works out.

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RE: Top Flite Giant P-51 Conversion - 9/20/2005 1:11 PM

Darrell B.

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red,

S-bec is a switching regulator with an output of 6v and can take up to a 52v input. It seems to work great except for the Rf issues.

Darrell

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RE: Top Flite Giant P-51 Conversion - 9/20/2005 1:36 PM

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quote:

ORIGINAL: red_z06

I've never used S BECs.

I've been using UBEC from koolflight with 6V 3A specs with good results.
I've picked up few 6V 3.5A 45V input switching regulators at the NEAT Fair. I'll let you know how it works out.

RedZ06,

The 6V UBEC from KFS is rated for 40V input, can you use a 10S Lipoly with it? Depending on how you look at it the 10S Lipoly will put out 37 to 42 VDC. Can't get a response from KFS on this question.

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RE: Top Flite Giant P-51 Conversion - 9/20/2005 1:40 PM

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quote:

ORIGINAL: Darrell B.

Tweet,

The wind at our field was swirling at 15 to 25 and mostly cross winds. If it had been straight down the runway it would have been a go.
My other problem is that I keep getting only intermittent good range checks. I have a Futaba 9001 servo that wants to buz a lot, and my S-bec battery eliminator for my flight pack seem to be causing RF interfearance when it warms up. It will start out and range check just fine, but then the range starts to diminish. It will range check ok with a regular 4 cell receiver pack. I need to get a 5 cell and just use it.
Does anyone have any suggestions on any of these issues/problems/opportunities?

I really want to fly this airplane before winter!!!

Thanks,
Darrell

Darrell,

Swirling gusty winds? Buzing servos? Range check problems? Those all sound like excuses to me. ;-)

I too have had good luck with the UBEC from Kool Flight Systems, but the 6V output is rated for 40VDC input maximum and I am not sure if it will work with 10S.

It may be that a 5 cell receiver pack will be the easiest and quickest way to get into the air.

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RE: Top Flite Giant P-51 Conversion - 9/20/2005 2:19 PM

Darrell B.

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Tweet,

I agree about the 5 cell receiver pack. I'm going down to a local battery vendor today to buy some cells. What size cells would you recommend, and would you go with nicad or nick/metal?

Oh, and you are probably right about the excuses.

This is my first big warbird.

Thanks,
Darrell

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RE: Top Flite Giant P-51 Conversion - 9/20/2005 4:46 PM

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Darrell,

Just kidding about the excuses. Nothing but some locker room taunting. Every time I go to my LHS I hear the TF 51 calling my name ($429).

I guess the easiest thing would be to get a 5 cell NiMh (lighter). I, like you, would still like to find a way to get a UBEC to work so you don't have to deal with yet another battery.

I'm hoping I can use the 6V UBEC from KFS. I'll let you know.

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RE: Top Flite Giant P-51 Conversion - 9/21/2005 12:55 AM

red_z06

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darrell:

6v 3.5a 45v input voltage regulator is from Medusa Research. I am using 12s2p on my little toni and non of the 6v ubecs work at 45-50v. I'll have to do some ground test and make sure medusa regulator can handle 50v. Are you sure s-bec is rated for 52v input? what is the output current?

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RE: Top Flite Giant P-51 Conversion - 9/21/2005 1:09 AM

Darrell B.

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Out put current depends on the unit you buy. I purchased the 6v output. It is rated for 12s input, and has capacitance to handle voltage spikes to 60 volts on hookup. Here is the link to their web site.

http://www.firmtronics.com/rc-products/sbec.php

I will appreciate anything that you can figure out.

Thanks,
Darrell

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RE: Top Flite Giant P-51 Conversion - 9/21/2005 2:35 AM

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Since I can't get KFS to answer back on the number of cells and since I am on the edge I will probably save my 6V out 40v in UBEC for another model. Looks like either the Medusa Research BEC or the Firmtronics SBEC would work from a specification perspective. I wonder if noise from the switch is causing your problem, Darrell? I guess you removed the SBEC and used a battery and the problem went away...

Looks like if you want 6V out conservatively speaking the KFS is good for 9S, the Medusa is good for 10S, and the Firmtronics unit is good to 12S. Or, you can go with a separate battery. Not sure yet what I will do for my first giant electric (WH Extra sitting in the box), but am interested to see how it works out for you guys.

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RE: Top Flite Giant P-51 Conversion - 9/21/2005 3:06 AM

Darrell B.

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Tweet,

You guesed right. I took out the S-bec, and replaced with a regular 5cell battery, and a switch harness. I looked at regulators, and the other ubec units, and am still trying to decide. I will be doing a maiden flight with the 6v 2500mAh flight pack that I made up today. I used the new Energizer NiMh 2500mAh cells from Wal-Mart. The price was right, and they took the solder very well. They made a nice neat clean looking pack. I'm doing an initial charge on it tonight. Tomorrow I will cycle it to find out what the actual capacity of it is going to be. The best price I could find on similar cells on the inter net was 2.95 per cell. These worked out to just 2.05 per cell. Not Bad.

Good Luck, on your new project.
Darrell

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RE: Top Flite Giant P-51 Conversion - 9/21/2005 4:22 AM

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Darrell,

Sounds like you're good to go. In some ways I feel better about using an old fashioned battery pack. However, I have had great luck with the KFS UBECs on a couple of airplanes so far. Medusa actually has a good reputation and I have some of their other products (power analyzer, etc.) so I think I will try my luck with their 6V output regulator. It should work just fine on 10S.

Sounds like you're all set. No reason why you shouldn't have a great flight.

Dave

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RE: Top Flite Giant P-51 Conversion - 9/21/2005 1:18 PM

Darrell B.

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Thanks Dave,

I'll post some final pictures of her all up, and ready, before her first flight. Then I'll post some after pictures as well. Thanks to all for your support and encouragement. We have church tonight, and my son has a football game Thursday night, so my first opportunity to fly will be Friday or Saturday weather permitting. Whish me luck.

Thanks,
Darrell

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RE: Top Flite Giant P-51 Conversion - 9/21/2005 3:03 PM

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Good luck!

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RE: Top Flite Giant P-51 Conversion - 9/27/2005 7:53 AM

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Hi Darrel, did you fly your P-51?

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RE: Top Flite Giant P-51 Conversion - 9/27/2005 1:23 PM

Darrell B.

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Tweet,

As they say around flying circles, "Life got in the way!"

Saturday morning each of my sons had soccer games, and by the time they were over the rain from hurricane Rita had reached us. Then it rained off and on Sunday combined with 20 mph cross winds straight out of the East. We also just lost our flying field Sunday to a Sam's Club that is being built next to where our field was. The contractor said that he didn't want to take any chances with us flying over the construction are so we got the boot. The only other flying field close is over 45 minutes away. I know that this sounds like a lot of excuses. I want to fly this airplane so badly, but I also want to do it right, and all of the guys in my club say to wait until I don't have to fight the cross winds. Trust me, this bird will fly, even if I have to take it to another town, field, club to do it. I'm sorry that it is taking me so long to get this done. I know that the guys in my club are anxious to see it fly also.
Good luck to all.

Darrell

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RE: Top Flite Giant P-51 Conversion - 9/28/2005 2:15 PM

Greg Covey

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Darrell,

Good luck on your maiden flight!

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RE: Top Flite Giant P-51 Conversion - 9/28/2005 10:07 PM

Darrell B.

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Thanks Greg,

I know that I have bugged you a lot through this build, and I also know that it has taken longer than anything that you have done. I really appreciate you letting me bounce ideas off of you along the way. It has been stormy here today, and looks like it might be that way through the weekend. I guess that I'm picky when I want good weather for a maiden flight. I have seen several others that wouldn't let a little wind, or bad weather hold them up. I just want to give it the best chance that I possibly can. Compound that with the fact that this is my first big bird, and that really adds to the tension factor. My spotter for the first flight is an experienced giant scale flyer, and he will be at my right elbow for any advice that I might need. Thanks again for your support, that is what is so great about this forum.

Good Luck to all,
Darrell

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RE: Top Flite Giant P-51 Conversion - 9/29/2005 2:22 PM

Greg Covey

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Darrell,

You're quite welcome. I would wait for better weather as well.

Can you summarize your power system setup and measurements if you have taken any?

My AXI 5330 appears to be working well with my burst setup to 3500 watts. I will, however, be looking for the next step up in power this Winter and determine which one has the most value, least complexity, and most reliability. Any comments on your motor choice like vendor support, mounting, or specification issues?

Regards.

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RE: Top Flite Giant P-51 Conversion - 9/29/2005 2:33 PM

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quote:

ORIGINAL: Darrell B.

Thanks Greg,

I know that I have bugged you a lot through this build, and I also know that it has taken longer than anything that you have done. I really appreciate you letting me bounce ideas off of you along the way. It has been stormy here today, and looks like it might be that way through the weekend. I guess that I'm picky when I want good weather for a maiden flight. I have seen several others that wouldn't let a little wind, or bad weather hold them up. I just want to give it the best chance that I possibly can. Compound that with the fact that this is my first big bird, and that really adds to the tension factor. My spotter for the first flight is an experienced giant scale flyer, and he will be at my right elbow for any advice that I might need. Thanks again for your support, that is what is so great about this forum.

Good Luck to all,
Darrell

Ditto on the thanks to you, Greg. Thanks for leading the way. Darrell, I am also interested in your actual numbers when you get a chance.

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RE: Top Flite Giant P-51 Conversion - 9/29/2005 3:05 PM

Darrell B.

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I really like the T-Rex 40 outrunner so far, no flights on it yet though! The combination of it and the CC HV 110 controller makes for a very smooth even spoolup of power. I can advance the trim on my throttle until it just starts turning over, call that my idle, and then when advancing the throttle it just smoothly advances up to incredible power. The radio that I'm using for this and my future projects won't be used for training purposes, so I put the throttle cut function on the trainer switch. If my ESC gives me a low power cut out, I can toggle the trainer switch, and reset the ESC to get power back for landing purposes. Do you all think that this is a safe option?

The T-Rex very well engeniered, but the glue that they use to put the magnets in is not adequate for the power levels that we are pushing these motors to. It is rated to 160 Amps but didn't come close to that before the magnets came loose. I used my trusty JB Weld to glue the magnets back in, and trust me, they aren't going anywhere. I will use it to fill the air gaps on the next one of these motors that I purchase. I had to order from Germany, a company called Hollein, and didn't want to waite for the postal service to get my motor back so I did the work myself. It was also during the companys holiday season.

I am planning on using the 230 Kv motor for a large Corsair that I'm starting this winter. I want to swing a 3 bladed 24 or 25 inch prop with it. My goal with the mustang was something faster, so I went with the 300 Kv on it. I am also toying with designing a reduction drive for these large outrunners, and they make a T-Rex with a Kv of 700 that would work great reduced down by say 3:1 for use with say a 28 or 30 inch prop. Can you say BIG PROP ON A BIG WARBIRD!!!!!

Anyway, the only readings that I have are touchy feeley. My friend John, has a Medusa power analyzer that I'm going to see if I can borrow. Are you out there John? The pull of this motor/20.5x12 prop/110Amp ESC/9000mAh 10s battery system is great. When I stand in front of the stab and run it up, it feals like it is pulling harder than my friends G62 on his Cub. Granted he is using a 24x8 prop and turning fewer RPMs than I am, but what the heck. If I can get that kind of power with a few more revs it will just give me a little more airspeed on the top end. I didn't mean to build a pylon racer, but that might be what I got. We'll have to wait and see!!

More reports, and information to follow.

Darrell

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RE: Top Flite Giant P-51 Conversion - 9/29/2005 6:15 PM

Joacim

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Hi!
Today we flew and tested with a 4blade 24" prop, piched up to 17,5", the actro 60-175 have no problem swinging this prop, no gear

total load of 2950watt and 3850rpm the extra flew with unlimited vertical, good speed to, this will be enough for the P-51 mustang we will but the motor and prop on, scale prop on scale plane

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RE: Top Flite Giant P-51 Conversion - 9/29/2005 10:59 PM

Darrell B.

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How many cells were you running it with? Was the 2950 Watts at full throttle?What do you think the Watts would have been with only 3 blades? I am anxuiusly looking forward to the development of your power system. Those big paddle blades would look great on the front of a Corsair also.

Darrell

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RE: Top Flite Giant P-51 Conversion - 9/30/2005 12:00 AM

Joacim

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Yes 10s2p 8000mAh Lipo, Jeti advance 90 plus, the pich is adjustibul up to 32, below is some data from testing.

4x24x10"
4400rpm
34,5v
64A

4x24x14,5"
3850rpm
33v
86A

4x24x17,5"
(i think 3750rpm, diddent get the rpm)
33,5v
92A

Motor barely warm after flying 6min with 3kwatt setup. Best for the coming Mustang i think will be pich araound 16 and 90amps, this gives both good speed-trust and saound

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RE: Top Flite Giant P-51 Conversion - 9/30/2005 12:10 AM

Joacim

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For 3 blade prop you could spinn 25-26x15" if its light with 60-175 on 10s Lipo, 60-200 on 10s would be araound 24-25x15"

For 2blade setups on these motors:

60-175
12s Lipo
24x14" Menz
5665rpm
69A
40,9v

60-175
14s Lipo
22x12" Forte
49,5v
65A
6400rpm

60-175
10s
27x13APCE
33v
75A
4200rpm

60-200
24x14 Menz
4730rpm
61A
33,8v

60-200
27x10 no limitz
80A
33v
4280rpm

Both the 60-175 on 12s and 60-200 on 10s will perform better with more rpm and trust with new 26x15" Mejzlik electric, wood and APCE props arent good enough.

< Message edited by Joacim -- 9/30/2005 12:12 AM >

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