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Top Flite Giant P-51 Conversion

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Old 10-13-2004, 12:07 PM
  #1  
Darrell B.
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Default Top Flite Giant P-51 Conversion

I am starting this thread because I want to convert the 1/5 scale Top Flight P-51 Mustang to electric power. I was reading a thread on the 1.50 size Hanger 9 P-51 that was converted earlier this year, and the technology is finally to the point that I think that I can successfully pull this off. Here is a link to the thread on the Hanger 9.

http://www.rcgroups.com/forums/show...62&page=1&pp=15

I like the Hanger 9 Mustang, but for as long as they have been around, I have wanted to do one of the Top Flight 1/5 scale birds. In looking at Sean's conversion he recommends that I use a 21x14 prop and the Hacker C50 14XL 6.7:1 motor. I am planning on using a 10s4p 9920mAh battery. My personal prefferance is to use a big outrunner, like the Actro 60, the Torcman Monster or if the smaller one can handle the amps one of them, or maybe the new AXI that is comming out this fall. I am hoping that I can keep the weight down to 20# with retracts, but not a lot of other frills. I want a good flyer, and then if I can afford to add a few extras then I might...

I am following Greg Covey's new conversion with great interest, in hopes of getting some good ideas at cutting weight, and for my power system. I'm not sure how long it will take me to put this build together so please be patient with me. There are several things that I am uncertain about, and want to make the right decision on them.

I would greately appreciate any and all input that all of you can offer me, and I will do a conversion in this thread as I go through the process. I will have to pay as I go, so some things may go faster than others.

Thanks in Advance for all of your advice,
Darrell B.
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Old 10-14-2004, 08:24 AM
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Default RE: Top Flite Giant P-51 Conversion

http://www.handlaunchglider.de/index.php?id=2&L=1

This company has a 1700 watt outrunner. I've traded a couple of emails with the US distributor. Looks like it could be a promissing motor.

John
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Old 10-15-2004, 11:59 AM
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Default RE: Top Flite Giant P-51 Conversion

Darrell,
Please do keep us posted, I for one am looking for a winter project, and it's a toss up between something like this and the VQ P38.

best of luck
BJ
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Old 10-15-2004, 04:15 PM
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Hannu Vuorinen
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Default RE: Top Flite Giant P-51 Conversion

Hi,


Well you would possibly need near +2500 wats power for good scale like power, so I think Torcman 685-20 or 685-30 would be good,
or actro 60-175. I have used a lot Torcman 685-30-22W, it works nicely at 2800watts/10s6p Kokams
On the other hand, Actros has been tradionally been the best motors on the market, I have one 60-140,
but havent got time to test it yet.
EDIT: forgot one very good one: Flyware T-REX40. www.flyware.de

Br,
Hannu
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Old 10-16-2004, 07:46 PM
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Darrell B.
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Default RE: Top Flite Giant P-51 Conversion

Thanks for all of the positive input, and encouragement. I will deffinately post here regularly. Please let me know just how much of this build that you want to see. Do you want just the conbersion stuff, or the rest of the ARF stuff as well? I know that there have been several builds on this airplane, so let me know!

Hannu,
Could you tell me, on your Torcman what the Kv is on it, and what size prop are you turning on it. I am hopeing for a 22 to 23" prop, with a 14 to 16 pitch. Are you using an E prop, or a regular one made for Gas? What brand are you using?
John,
Do you think that a person could wind one of those motors with heavy enough wire to handle 2500Watts? I like the idea of the internal cooling!
BJ,
I to would like to build a P38. I really would like to build the Yellow Aircraft version, but I deffinately don't have the coin right now to pull it off. I really think that without the worry of loosing an engin, that one of these could really be put throught it's paces!
thanks for any info that you can offer!
Darrell B.
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Old 10-18-2004, 05:35 PM
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Default RE: Top Flite Giant P-51 Conversion

I'd check with Craig.

John


American Importer

Craig D. Allen

5946 Van Alstine Ave. Suite 6

Carmichael, Ca. 95608

916-519-7368

email Craigdallen@sbcglobal.net
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Old 10-20-2004, 03:54 PM
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Hannu Vuorinen
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Default RE: Top Flite Giant P-51 Conversion

Darrel,

Mine TM685-30-22W is using 26x12 Menz and 25x12" Engel carbon prop, but as all big Torcman motors are tailormade according to customers wish, it can be winded differently into different style of plane.
Mine is in large 14ft Super Cub, whereas highest possible torque was one of main criterias
for prop select. I would guess in your case wind should be much hotter, maybe in a region of 16-18W.
I would not recommend to use any E-props in this kind of power set-up, like APC, they tend to "swing and bend" while adding power, on same time loosing prop efficiency.
Br, Hannu
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Old 10-20-2004, 04:52 PM
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Default RE: Top Flite Giant P-51 Conversion

I really enjoyed the Hanger 9 P-51 thread at:

http://www.rcgroups.com/forums/showthread.php?t=233662

This conversion should be more scale but at the expense of more weight. I am very exited to hear your results especially the motor selection and RTF weight.


I would post pictures and information on the E-conversion parts as well as anything interesting or out of the ordinary.
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Old 10-21-2004, 02:08 PM
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Darrell B.
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Default RE: Top Flite Giant P-51 Conversion

John,
I emailed Craig, and he is checking, he also said that he is getting a larger size motor at the first of the year. If I'm still looking by then, I'll consider it.
Hannu,
Would you have the link to Menz? I hear their props are top notch.
fbw4,
I'll be posting here each step of the way, as my conversion progresses. I'm still in the hunt for just the right motor!
Good luck to all,
Darrell
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Old 10-21-2004, 03:40 PM
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Hannu Vuorinen
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Default RE: Top Flite Giant P-51 Conversion

Darrel,
I dont know if there is any web site for Menz props, but you can find them at least from
germany, www.hoellein.com. Its quite a popular brand in europe, I am not sayin they are the best, but at least they work very well, at very reasonable price.
in many cases I have tried APC props, but quite often gone back to Menz props.
Its fancy most of F3A pilots likes those, I have not found any especially good for large electric ones
to work best with APC. For higher rev. applications also german Engel Super Silence CF-props works nicely, but expensive

Br,
Hannu
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Old 10-21-2004, 06:22 PM
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Default RE: Top Flite Giant P-51 Conversion

Hannu,
Thanks for the link. It was very helpful. I like the looks of the Menz props, and the 22 x 14 or the 22 x 12 should work just fine. Are they efficient?
I see what you mean about the price of the Engel Props.How would their weight compare with say the Menz wood props?

Thanks,
Darrell
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Old 10-25-2004, 04:06 PM
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Hannu Vuorinen
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Default RE: Top Flite Giant P-51 Conversion

Hi,

Engel CF props are very light, they are hollow molded, I would guess they are not heavier than Menz, maybe a bit lighter.

Br,
Hannu
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Old 10-25-2004, 07:10 PM
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Joe Ortiz
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Default RE: Top Flite Giant P-51 Conversion

Very interesting thread, I'm keeping an eye on this one, I got a House of balsa 1/12 scale that I want to build as e-power, not a giant, but a motivation factor.
Joe
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Old 10-25-2004, 08:28 PM
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Darrell B.
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Default RE: Top Flite Giant P-51 Conversion

Joe,

I have the 43" HOB P-51 that I converted using the AXI 2808-24, Jeti 30 Amp ESC, and 1660mAh Apogee 3s2p battery pack. I built it with no landing gear, and either hand or bunge launch. Almost unlimited vertical. 20 Minute flight times easily. Here are a couple of pics...

Darrell
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Old 10-25-2004, 08:52 PM
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Default RE: Top Flite Giant P-51 Conversion

Guys, the best carbon props in the world come from my mate Supercool - www.supercoolprops.com - he does hollow carbon ones as well. BTW, tell him I sent you!
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Old 10-26-2004, 08:21 AM
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Default RE: Top Flite Giant P-51 Conversion

Nice plane Darrell, I'm going to keep the landing gear in mine.
Joe
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Old 11-24-2004, 07:12 PM
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Darrell B.
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Default RE: Top Flite Giant P-51 Conversion

Well, as much as I would like to use one of the new big outrunners, none of the are able to turn the RPMs that I am wanting for my
P-51. Since I am going to have to use the Hacker 90 Acro ESC, I am going with the Hacker C50 13XL Acro, turning a 21x14 prop. I am counting on very good vertical, and a top speed just over 100mph. I have been working on the basic wing construction, hinging ailerons, installing servos, installing retracts. I am almost ready to join the two wing halves together. Since it looks like winter is rearing its ugly head, I can build for a spring maiden. Of course there is always the chance of a nice winter day![8D]
Darrell
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Old 01-16-2005, 07:53 PM
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Default RE: Top Flite Giant P-51 Conversion

Hi All,

I thought that I would check in and let yoy know where I am on this project. I am having to relocate the retract air tank, so that I can open up the top of the fuselage for battery acess. The first picture shows the stock location, the next three show a view of the area where the fuel tank usually goes. This is where the air tank is going. I will then use the tops of the cross braces that hold the air tank in place as supports for the battery tray. Note: I used the ply floor for the gas tank compartment to create a second air tank holder. The rings on the flat end of the tank will be glued to the firewall and act as a tank support and guide for glueing braces to the firewall for supporting the battery tray, the trick is to get the airtank high enough for the wing to clear it and still place the battery tray low enough in the fuselage so that the plane isn't top heavy.

Darrell B.
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Old 02-05-2005, 09:32 PM
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Default RE: Top Flite Giant P-51 Conversion

Sorry for the Slow Progress. No time to work on my airplanes.[]

Here are a few more pictures of the interior with air tank permanently mounted, servos, cockpit, battery hatch, and battery area. I removed the battery tray so you could see the interior details. You'll have to excuse the messy interior, I haven't taken the time to tidy up yet.
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Old 02-05-2005, 09:35 PM
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Default RE: Top Flite Giant P-51 Conversion

And some more pictures. These are of the finished hatch. I used dowel pins to hold it straight, and 8 sets of magnets to hold is down. This baby isn't going anywhere.
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Old 02-05-2005, 09:37 PM
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Default RE: Top Flite Giant P-51 Conversion

Here are some pictures of my proposed propeler, and the business end of this plane. Prop is a 24x12 APC.
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Old 02-07-2005, 02:58 PM
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Default RE: Top Flite Giant P-51 Conversion

Isn't the 24x12 a little large for the 13xl on 10s ?

marc
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Old 02-09-2005, 07:12 PM
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Default RE: Top Flite Giant P-51 Conversion

Marc,

I have made a change to the power plant. I am now going with one of these...

Darrell B.
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Old 02-10-2005, 01:31 PM
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Default RE: Top Flite Giant P-51 Conversion

flyware? torcman?...definitely a LRK...
weight?
batteries to be used and prop?
thx
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Old 02-10-2005, 02:17 PM
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Default RE: Top Flite Giant P-51 Conversion

Flyware T-Rex 40 300 wind. APC 24x12 prop on a 10s4p, probably Tanics 2220 cells. The motor is heavy, around 32 oz, but these planes are notoriously tail heavy. I have my battery tray butted right up against the back of the firewall, and I'm not against mounting some batteries inside the coweling. I absolutely refuse to mount any lead on this plane!! I'll install another 10s of Lipos first. My only limiting factor for going with an 11 or 12s arangement is my ESC. Even the Hacker Master 90 is only rated to 10s.

Good Luck & Happy Flying,
Darrell B.
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