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Author Topic: Cardinal conversion  (Read 2133 times)

Offline Daniel_Munro

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Cardinal conversion
« on: December 29, 2015, 07:52:21 PM »
Hi all.

After much frustrations with my ST46 on my Cardinal I've decided to convert it to electric. No matter what I've tried I cannot get the Tigre to run consistently so it's going to go back in the drawer.

I'm still in the infant stages of electric control line and am after some opinions on what I've brought to put in it.

Motor, Turnigy SK3 3548 - 840kv
ESC, Turnigy Trust 55a
Timer, KR2 governor timer
Battery, 4S 35c 3000mah
Prop, either 11.5 x 5.5 or 12x6, thin blade APC either way

The motor is only a cheapy, if I get a summers flying from it ill be happy.

Dan.

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Offline Tim Wescott

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Re: Cardinal conversion
« Reply #1 on: December 29, 2015, 09:13:38 PM »
You did not give an all-up weight, but the battery ought to be good for up to 50-55 ounce all-up weight, depending on how deeply you're willing to deplete the batteries.

840 RPM/V and only four cells may leave you a bit scant on overhead at the end of the flight.

All in all, if you've already bought it I'd say to go for it -- at worst it'll be marginal toward the end of the flight, it'll only need different batteries to correct the problem, and you'll have enough information to go buy what you need.

Keep us posted.

(Don't tell any of the other guys on this group that I'm suggesting this, but you could also just slap an OS 46LA on the thing -- it should be a lot easier to tame than an ST 46, and you won't have to make as many changes.)
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AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline Daniel_Munro

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Re: Cardinal conversion
« Reply #2 on: December 29, 2015, 10:32:46 PM »
Quote from: Tim Wescott on December 29, 2015, 09:13:38 PM
You did not give an all-up weight, but the battery ought to be good for up to 50-55 ounce all-up weight, depending on how deeply you're willing to deplete the batteries.

840 RPM/V and only four cells may leave you a bit scant on overhead at the end of the flight.

All in all, if you've already bought it I'd say to go for it -- at worst it'll be marginal toward the end of the flight, it'll only need different batteries to correct the problem, and you'll have enough information to go buy what you need.

Keep us posted.

(Don't tell any of the other guys on this group that I'm suggesting this, but you could also just slap an OS 46LA on the thing -- it should be a lot easier to tame than an ST 46, and you won't have to make as many changes.)

Tim.

Thanks for your response.

Sorry I didn't think to include weights. I just weighed everything, airframe with no motor is 830g, motor with prop and spinner attached 229g, ESC 58g, Timer + switch 7g and finally battery 347g. Total 1471g or 51.8oz.

May as well say 52 oz by the time I add a little wire and plugs.

There was another motor at 910kv but it was a 3 pole motor and I wasn't sure if this was going to work or not.

The Turnigy I've got is a 14 pole motor. I really don't know what the difference means though.

I can get a 3300mah battery which is only 10g heavier if I find I am lacking power towards the end of the flight.

As for the LA46, I've got one here but its done its dash and has been retired. Its done lots of work and doesn't start or run like it once did. Best engine I've got is my Stalker .51 in my Legacy 40. But that plane too is likely to get a conversion to electric. Then the Stalker will go in a Claus Maikis Duetto.
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Offline Keith Renecle

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Re: Cardinal conversion
« Reply #3 on: December 30, 2015, 11:30:33 PM »
Hi Daniel,

As Tim says, the 840 Kv is a bit low. You will not get enough rpm to fly the profile Cardinal without going to a 5 cell pack. I can tell you from much experience with .40 size C/L models, that you will be disappointed with such a heavy set-up. You need a motor that weighs around 140 to 150 grams for a .40 size stunter.  A 5 cell pack gets a bit too thick to strap onto a profile fuselage so stick to a 4 cell battery of around 2200 to 2500 mAh, and 25C is more than enough. Higher than that just adds weight. The cheap motors to look at are the E-Max BL-2820 or the E-Max GT- 2820-06. The 11 x 5.5 APC props are perfect for this type of model. You only need a 40 amp esc as well, so all of these things can save a lot of weight.

A few years ago I modified a friend's .40 size profile from an OS LA.46 to electric and I have a few photos on how to do this quite easily. If you need to see this, then drop me an e-mail to krenecle<at sign>netactive.co.za and I'll send you the details.

Keith R
« Last Edit: December 31, 2015, 10:08:48 PM by Keith Renecle »
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Offline Daniel_Munro

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Re: Cardinal conversion
« Reply #4 on: December 31, 2015, 01:28:33 AM »
Quote from: Keith Renecle on December 30, 2015, 11:30:33 PM
Hi Daniel,

As Tim says, the 840 Kv is a bit low. You will not get enough rpm to fly the profile Cardinal without going to a 5 cell pack. I can tell you from much experience with .4o size C/L models, that you will be disappointed with such a heavy set-up. You need a motor that weighs around 140 to 150 grams for a .40 size stunter.  A 5 cell pack gets a bit too thick to strap onto a profile fuselage so stick to a 4 cell battery of around 2200 to 2500 mAh, and 25C is more than enough. Higher than that just adds weight. The cheap motors to look at are the E-Max BL-2820 or the E-Max GT- 2820-06. The 11 x 5.5 APC props are perfect for this type of model. You only need a 40 amp esc as well, so all of these things can save a lot of weight.

A few years ago I modified a friend's .40 size profile from an OS LA.46 to electric and I have a few photos on how to do this quite easily. If you need to see this, then drop me an e-mail to krenecle<at sign>netactive.co.za and I'll send you the details.

Keith R

Hi Keith.

Thankyou, it seems I've brought the wrong motor. There is another Turnigy 35mm with a kv of 1000. I did notice that Brodak sell an  Arrowind 2820 which I think is the same motor as the Emax you mention? Maybe I'll buy something like that to use.

I've found it very slow getting batteries, 2x 4s 3000mah arrived today from Axi Express. They are at this stage the only batteries I own in a 4s. I can get a 2600mah locally but it's actually heavier than the 3000s.

I am on holiday for the mext few days. I'll email you when I get back to my PC at home.

Dan.
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Offline Keith Renecle

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Re: Cardinal conversion
« Reply #5 on: December 31, 2015, 10:11:59 PM »
Yes the Arrowind is exactly the same motor, and for the price it is a great motor. Enjoy the rest of your holiday and we can chat later.

Keith R
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