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Old 03-16-2015, 04:52 PM   #1
Redwulf__34
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Default Playboy JR Engine Help

Hi guys,

I'm an old glow engine guy and have ZERO clue about electrics.

A very nice fellow gave my son an Oldtimer Playboy JR to learn on. It's been wrecked but we'll get her back in flying order. Can anyone give me an idea on what size electric motor to use?

If anyone has a scan or PDF of the plans it might be helpful too. I need to rebuild the nose a little and not sure exactly how it all was supposed to be. I have searched online and not seen or found anything.
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Old 03-16-2015, 08:12 PM   #2
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There have been a few planes by that name over the years... might help to put up a couple of pics and measure the wingspan.
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Old 03-16-2015, 11:01 PM   #3
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Originally Posted by Redwulf__34 View Post
Hi guys,

I'm an old glow engine guy and have ZERO clue about electrics.

A very nice fellow gave my son an Oldtimer Playboy JR to learn on. It's been wrecked but we'll get her back in flying order. Can anyone give me an idea on what size electric motor to use?

If anyone has a scan or PDF of the plans it might be helpful too. I need to rebuild the nose a little and not sure exactly how it all was supposed to be. I have searched online and not seen or found anything.
my Bub Ed has one ( we flew it yesterday) , he's got a 400 size 900 kv, on a three cell 1300 lipo, I ask him about the plns he used,, I know he said they were kinda old plans,
bubsteve


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Old 03-26-2015, 02:02 PM   #4
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Wingspan is about 54" I believe. Heres a photo. I just don't have any idea about how electric engines size.


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Old 03-26-2015, 03:34 PM   #5
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Target 100 watts/lb for trainer types

kV * nominal voltage of the pack * .8 = expected full throttle RPM (a little conservative)


Find a motor that is rated for the same prop as you would use for glow and will turn it about the same RPM. You'll end up slightly lighter than the glow version when the tank is full... a little heavier than with tank empty.

bphobbies.com has Cheeta motors with enough data to make the choice with that much knowledge and these are reasonably priced reliable motors.


That's looking a lot like a conversion of a "Playboy" of the mid 1940's to early 1950's. Possibly earlier. There were a few FF models with that name going back into the 1930's. Hard to keep track of them all.

SAM sticker on the tail... looks like someone may have used it for classic model competitions.

Can look through some ancient magazines and see it that one is in the ones I have.
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Old 03-28-2015, 03:59 AM   #6
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She's not a Playboy of any incarnation. She's a Buzzard Bombshell designed in 1940 by Joe Konefes of the Chicago Buzzards Club. Original was 72" wingspan but there has been some 50"-ish size kits made over the years such a Midway Models version that is a 70% scale at 50".

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Old 03-28-2015, 04:05 AM   #7
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Here is plans from someone's doings.


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Old 03-28-2015, 05:00 PM   #8
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That's her! Thanks. That's helpful for balance points.

Just need the engine yet. Wingspan is actually 42" and the weight is 8 oz without radio. I have a tactic I'll use. Looking for it to fly slow and gentle as a trainer. Fhhuber I failed algebra! That looks like algebra to me!

I'm not sure why I'm not getting the email notifications for replies.
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Old 03-28-2015, 05:50 PM   #9
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http://www.bphobbies.com/view.asp?id...7&pid=D1748437

I'd go with this one... and use a folding prop on 2 cells 2000 to 2500 mah LiPo. that could take it up like a helicopter then fold for very long glides.

Lots of power options in one motor.
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Old 03-28-2015, 06:15 PM   #10
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Can you show me the math fhhuber..............I'm curious how it works.
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Old 03-28-2015, 07:26 PM   #11
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42", that looks like the Baby Bombshell....


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Old 03-28-2015, 08:52 PM   #12
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Originally Posted by Redwulf__34 View Post
Can you show me the math fhhuber..............I'm curious how it works.

its pretty simple... the calculation tells you how to find a motor that turns the same prop the same RPM when doing a glow - electric conversion. From there you can look at the motor rating and find watts.

Same prop same RPM... same performance.
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Old 03-29-2015, 01:53 AM   #13
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Yep It's a baby bombshell! Thanks DEG.
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Old 03-29-2015, 03:47 AM   #14
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Thanks to Leadchucker for his posts...I sort of felt it wasn't a Playboy cause that wing wasn't on a pylon but he got us in the right ballpark...
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Old 03-29-2015, 04:32 AM   #15
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Originally Posted by DEG View Post
Thanks to Leadchucker for his posts...I sort of felt it wasn't a Playboy cause that wing wasn't on a pylon but he got us in the right ballpark...
Just for fun......Not all Playboys were pylon jobs or polyhedral winged. It could be built as a cabin job with straight dihedral wing or polyhedral wing or as a pylon model with the same wing choices.


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