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srh990
01-08-2006, 08:22 PM
I've been giving some serious though to converting a Hanger 9 P51 to electric, something I know has been done a few times. My initial proposed setup is to use an Axi 4130/16 with either a Jeti 45 Opto or 77 Opto. I have two options for batteries, I have a pair of Flightpower 3S2P 5000mAh packs to run in series (these are the 10.5 to 14C packs) or two 3700mAh 4S packs in series, being the new EVO 20C packs. Both sets of batteries weight the same within a few grams so weight isn't the issue, just whether an 8S pack will effect prop size too much. I also wondered about a Hyperion alterantive as I have a couple of their motors that perform very well at reasonable prices.

Mike Parsons
01-09-2006, 08:19 PM
I think the 4130/16, Jeti 77, and a 6S2P would be a winner. I assume we are speaking of the 60 size? The FP packs should be able to handle the 50 amps that should give around 1kw. You should be swinging around a 15x10 or 16X10at most for good pitch speed and thrust.

-Mike

srh990
01-09-2006, 08:24 PM
Mike,
thanks for the reply. The axi setup is supposed to be a 60 size replacement and I'm happy with the 6S2P setup. A major problem I have is that our flying field is pretty bumpy and I've a fair bit of experience flying second WW warbirds and it can be pretty hairy with Spitfires & Mustangs. A big concern is prop size as nose-overs are frequent, would a 15" prop give reasonable clearance?

Mike Parsons
01-09-2006, 08:26 PM
I am pretty sure that it would. I havent tried it personally, but know of a few people that are flying it with the 15". I even know one using a 16", so the the 15" has to clear in my mind.

-Mike

srh990
01-09-2006, 08:39 PM
Yea, we have a guy in the UK, Pete Nicholson, who's electrified the Hanger 9 Mustang, P40 and Corsair with this setup. I know this works but wodered if there was any advantage in going for the 8S setup? If not then the tried & true is probably the way to go although on the P40 he's used a Thunder Power 6Ah 6S3P pack with the 4130/16 swinging a 15 x 10" APC prop but with the new Jeti 45A ESC. The smaller Jeti is 100 list in the UK, the 77 being 130. Motocalc is optomistic on max current, although I know it's somtimes well off with Axi motors. I do use a lot of throttle management and prefer to fly in a scale like manner - too fast looks wrong and with the Ripmax Spit I've got it spends most flights at around 1/2 throttle.

Mike Parsons
01-09-2006, 09:10 PM
8S on the 4130 is too much votage and will require something like a 12-13" prop. I think speed may not suffer, but thrust will. I like the 6S option better.

I like and prefer the headroom on my ESC's. If I am going to be pushing 50 amps peak I would choose a 60 amp esc or 77a over one rated at 45a even though it might burst to 55. There is actually a technical reason for this and for the life of my I cant remember it. :)

-Mike

laxlife
01-16-2006, 01:31 PM
We've had real good experience powering the Hangar 9 60 size warbirds (P-51, P-40, F4u) with the Hacker C50 10XL which geared 6.7:1 powered by a couple of 3s3p 6000mAh ThunderPower lipos wired in series. The prop is an APC 12x8 and we get unlimited vertical and about 20 minutes of flying. I like the Axi motors but prop size becomes an issue in this Hangar 9 60 size model. As the Axi 4330's need a 17" prop and the 5330's a 20+" prop to get the max Watts to the prop. The Hacker C50 costs about $100 more than the Axi 4330 but I'd say the performance increase is worth it.

srh990
01-21-2006, 11:06 PM
Well, I haven't taken the plunge on the P51 yet but I've had a Cambrian 55" Spitfire kicking around the shed for around 6 years. It last flew - barely at that - on an OS 48 Surpass which was probably a bit underpowered for a 6 pound model. I've got a couple of 50A Hyperions speed controllers kicking around, plus a couple of the new Evo20 Flightpower 4S 3700mAh lipos so I thought a little conversion was worth trying. I bought an Axi 4120/14 with an APC 14x8.5 prop and with half a days chopping around the Axi was in and the Surpass was out.

I took it to the field today, remembering how I hated flying it as it struggled of the deck and staggered around the sky - with the Axi at full throttle it was off the ground in no time at all and flew at a fair speed just using half throttle, man I'm hooked on bigger planes now! If I'd been building the spit with electric in mind I could have saved a fair bit of weight, even with the air retracts.

There's a conversion of the Hanger 9 P47 in Q & EFI this month, using the Efite 60 motor instead of the Axi usually used so now I can't decide between the P47 or the P51:)

Gordon
02-25-2006, 10:09 AM
Hacker C50 10XL which geared 6.7:1 powered by a couple of 3s3p 6000mAh ThunderPower lipos wired in series. The prop is an APC 12x8 and we get unlimited vertical and about 20 minutes of flying.

Hi WD. Sorry to query your figures, but I can't see that a 6.7:1 box on a 1624rpm/V motor like the C50-10XL is gonna turn a 12x8 fast enough and pull enough current from 6s lipos to give you unlimited vertical with a H-9 warbird. 20 minutes flying maybe.

I fly 6s 6000 prolites all the time with a 1420rpm/V Maxcim (and yes I know the Hackers are more efficient - I do own Hackers - but not all that much more efficient) geared 2.73:1 on a 14x10 Zinger at about 47A, 950W, and even that doesn't provide the urge for unlimited vertical in a 7lb 5oz Kyosho CAP 232 which is quite a lot smaller than the H-9 warbirds.

I suspect your battery numbers are wrong - 2 x 5s3p sounds more like it for unlimited vertical.

Gordon

cdallen
03-15-2006, 03:18 AM
8S on the 4130 is too much votage and will require something like a 12-13" prop. I think speed may not suffer, but thrust will. I like the 6S option better.

I like and prefer the headroom on my ESC's. If I am going to be pushing 50 amps peak I would choose a 60 amp esc or 77a over one rated at 45a even though it might burst to 55. There is actually a technical reason for this and for the life of my I cant remember it. :)

-Mike

If one is using say a 15c 5000mah battery the speed controller is always seeing around 75 amps. The throttle regulates the amount of time this goes to the engine and gives the engine an average until WOT. So if you put a 60 amp esc on this set up you will eventually burn out the speed controller. The prop determines amps to the engine at WOT. So if you prop this set up for 80 amps you will also kill the motor(assuming it is rated to 60amps) along with the battery and esc. This is my understanding but I am far from any authority.
Better yet.. open this up and scroll down to myth and mysteries. http://www.castlecreations.com/media/castle_scribe_archives/Castle%20Scribe%20CE-01-Aug2005.pdf (http://www.castlecreations.com/media/castle_scribe_archives/Castle%20Scribe%20CE-01-Aug2005.pdf)

laxlife
03-15-2006, 04:11 AM
You're correct my prop is not a 12" but a 15x6 APC. But the battery data is correct. Unlimited vertical? Who knows but it goes straight up with such authority and willingness that the impression is left that its headed to the moon.

dusmmdb34
06-06-2006, 08:14 AM
Has anyone done this conversion?? I have one of the Hangar 9 P51 pts aircraft and I plan to use a axi 4120 18 on 6s. I am not sure if the PTS is the same size as the regular Hangar 9 P51, the wing span is 51.25"

feathermerchant
06-06-2006, 12:58 PM
I have the H9 60 size P-51. It weighs 8lb and I think is larger than the PTS. So the 4120 might be a good choice. I don't have any experience with that motor.
On the clearence issue, I have flown mine wih 15" and 16" props with no issues. Nose overs are rare for me but they do happen. I have only broken one prop on a nose over. If it's on taxi and you throttle back as you see it go, the prop usualy just stops.

laxlife
06-06-2006, 02:35 PM
I converted my PTS P-51 last month. It is smaller than the 60 size H9 Miss America or P-51D. It flies great and is a good low wing next step up from my trainer. I used this setup
Axi 4120-18
Jeti Advance 77 Opto Plus
two Polyquest 4s,3p 14.8volt lipo packs in serial to produce 30+/- volts
I ended up keeping the stock 3 bladed prop and it flies great. I never expected to use this prop but the ground clearance is too low to use the 12" prop these Axi 41xx's need (its a problem with all conversions of 6-9 lb planes that fit this Axi 4xxx's motor specs because they often don't have the ground clearance for the prop this motor needs to produce adequate power.) The little stock prop surprised me but its just fine.
I'm getting 1100 watts at 40 amps with a RTF weight of 7.5 lbs
I'm not using the wing tip stall guards and flying is no problem so far and I'm not much more than a rookie pilot.
See my previous post for the larger H9 P-51's. I just can't say enough about the wonderful performance of that bigger plane mounted with a Hacker C50-10xL and 2, 3s3p batteries in series. Straight up! and it sounds cool too because of the Hacker's integral 6.7:1 gearbox. My son flies it and he's promised to teach me--someday.

w5kfg
12-09-2009, 08:47 AM
Does anyone have pics of their mods?
I have a hanger 9 .46 size that I would like to convert