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Old Apr 27, 2012, 08:36 PM
Bypass Ratio = Infinity
scatsob's Avatar
United States, NC, Jacksonville
Joined Apr 2006
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Thank you for the info Travis. How was it going to be too small for the 20% P-51? Or was it an issue of prop size? I am comfortable with pushing this motor to 3.5kW to 4Kw per motor in bursts which should be plenty to fly a 30 pound plane at 230 watts/lb.
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Old Apr 27, 2012, 09:26 PM
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edf nut's Avatar
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They fly these on at least a DA-150, on alcohol and swing around a 30" prop.

I dont think you have studied into this enough see all the numbers and see what it would take to do one of these electric.
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Old Apr 28, 2012, 02:44 AM
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mackone's Avatar
Australia, VIC, Vermont
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Well done on the Axi Bob

One of the guy's on the PC-21 thread runs his single 5330-F3A , on 12s with a 18x10x3 Mejzlik prop with no problems . Is the double similar specs?
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Old Apr 28, 2012, 06:01 AM
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Old Apr 28, 2012, 06:20 AM
Bypass Ratio = Infinity
scatsob's Avatar
United States, NC, Jacksonville
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Quote:
Originally Posted by mackone View Post
Well done on the Axi Bob

One of the guy's on the PC-21 thread runs his single 5330-F3A , on 12s with a 18x10x3 Mejzlik prop with no problems . Is the double similar specs?
It's exactly the same, 235kv. I saw Jack's posts on the PC-21 thread about the AXi on 12s and that makes me feel better. Given the quality of the motor I couldn’t see a reason why pushing it to 4kW per motor is going to be a problem. And the plane is meant for 150-200cc motors, I'm not going to argue that, but it is also meant to fly 200+ MPH and weigh between 45 and 50 lb. Mine won’t be flying that fast or weigh that much.

edf nut...do you have experience burning up AXi motors? And how close is eCalc to reality?
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Old Apr 28, 2012, 06:27 AM
"the bouncer"
mackone's Avatar
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You beat me to it ! its the same

Watts with the Popcorn Nut ?
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Old Apr 28, 2012, 08:10 AM
building building building!
aerophilia's Avatar
Melbourne Australia
Joined Jun 2006
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Enough about the motor, when does the plane arrive
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Old Apr 28, 2012, 09:05 AM
Bypass Ratio = Infinity
scatsob's Avatar
United States, NC, Jacksonville
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Working on it. I am trying to see if I can source an actual Miss Ashley kit that would not need to be converted, but I fear it will be very expensive. From a little research I found out the unbuilt airframe is under 12 lb. so with 12 lb. of battery and motor it might be possible to keep a large plane like this under 30 lb.
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Old Apr 28, 2012, 09:51 AM
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Here is something else to think about,

Ok, (2) 3 blade 18" props.. with a 6" dia spinner...


I might could see getting it to weight 35 lbs, that is about what my P-38 will weigh.

Im not trying to be negative, just realistic.

Travis
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Old Apr 28, 2012, 11:16 AM
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Old Apr 28, 2012, 12:05 PM
Bypass Ratio = Infinity
scatsob's Avatar
United States, NC, Jacksonville
Joined Apr 2006
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Quote:
Originally Posted by edf nut View Post
Here is something else to think about,

Ok, (2) 3 blade 18" props.. with a 6" dia spinner...


I might could see getting it to weight 35 lbs, that is about what my P-38 will weigh.

Im not trying to be negative, just realistic.

Travis
That is what the forums are all about; sharing of information, experience, and opinion. I appreciate your taking the time to do so in my thread.

The plane is 100", glass fuse with sheeted wing and stabs. The one I am trying to get locally is an older kit from Ed Rankin and probably a little heavier than the newer ones. I have emailed a few people about getting a new Miss Ashley kit but I think it is going to be a bit out of my price range.

I have also emailed AXi about getting an extended shaft for the 5330 (itís not really long enough for a contra setup) and for giggles asked what a custom double 5345/14 would cost.
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Old Apr 28, 2012, 12:21 PM
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Scott, a friend had the 42% Comp ARF Super Extra running electric a few years ago. It used a Hacker quad c50 set-up with four escs and I was told it had more power than a DA-150, in fact they had to change it to a DA-170 to get the same horsepower I wonder how a set of rimfire 65cc's ganged together with 24" 2 blades would work out on the Vendetta, that would give you 10,000 plus watts and make the Vendetta come alive!
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Old Apr 28, 2012, 02:21 PM
Bypass Ratio = Infinity
scatsob's Avatar
United States, NC, Jacksonville
Joined Apr 2006
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You bring up an interesting idea. After looking at some of the new larger motors that HK has to offer it does not look like it would be too difficult to bolt two motors together back-to-back. I would need to see the motors apart to be sure, but it looks like all it would need is two large bearings in the front bell to hold the through shaft from the rear bell. It would be a very similar setup to the big contra motor that they already sell. Hmmmmm....
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Old Apr 28, 2012, 06:13 PM
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Basingstoke Roy's Avatar
United Kingdom, England, Basingstoke
Joined Oct 2005
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I'd agree with that. I haven't had a look at these new motor yet but looking at your photo, It looks like there may be a bearing at the rear of the bell as well. Which is a good thing

The biggest problem I had with building contras was stopping the magnets touching the stator, because of the play (float) in the bearings at the front of the bell. The new generation of motor with a bearing at the other end to keep the bell true will stop all that.

watching your build making me hanker for another contra model
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Old Apr 28, 2012, 06:31 PM
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USA, SC, Greenville
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Quote:
Originally Posted by scatsob View Post
edf nut...do you have experience burning up AXi motors? And how close is eCalc to reality?
I have never had any trouble with any axi motors I have had. One of the main reasons I went with them in my P-38. Another reason one of my good friends also has the 5345-14 in his Yellow Aircraft P-47 on 10s and has been a great set up.
Scorpion on the other hand, just sent one back about 2 weeks ago.
Had about 10-12 flights with a 4025-550 on 8s in a sundowner 50 with 3200 watts and the magic genie decided he wasnt staying in the motor any more.
They said they couldnt warranty it, but helped me out a little on a 4035-560 v3.
Should be pretty insane

As far as eCalc, I think its a good starting point for a lot of projects. But over the top stuff really takes experimenting and trial and error.

take care
Travis
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