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Airframe for Mackay 150 radial

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Airframe for Mackay 150 radial

Old 08-08-2006, 03:43 PM
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Default Airframe for Mackay 150 radial

Hi guys,

I'm looking for some advise and sugestions.
I'm toying with the idea of getting a Mackay 150 radial when they come out, and would like to put it in either a Sukhoi or a Yak.
I will be using it for scale aerobatics and I'd like unlimited vertical.

Mackay 150 radial (for those who don't know) is a 150cc gas 4 stroke that'll put out no more power than a 100cc 2 stroke gas.
Diameter 160mm. (6 5/16")
Weight 3.5 kg. (7 3/4 lbs)
So it's not that powerful for it's weight and I need to make sure the wing loading dosen't end up to high.
Any ideas as to size / manufacturer?

Cheers,
Didg.
Old 08-08-2006, 03:46 PM
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Default RE: Airframe for Mackay 150 radial

Forgot to mention, ARTF not a kit.

Cheers,
Didg.
Old 08-10-2006, 02:14 PM
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Default RE: Airframe for Mackay 150 radial

H9 Sukhoi ??
Old 08-11-2006, 06:11 PM
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Default RE: Airframe for Mackay 150 radial

Hi 3D Joy,

I've been told that they don't make it any more.
Thanks for the suggestion though.

Anyone else got any ideas?

At the moment I've got; Composite ARF Yak and Airworld Suchoi SU 31, both 102" WS as possibilities.

Cheers,
Didg.
Old 08-12-2006, 05:39 AM
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Default RE: Airframe for Mackay 150 radial

I had the Mackay 215cc radial in a Sukhoi 33%. Power to weight was not stunning and wing loading too high at over 40lbs. Its going to be even harder to get the wing loading right in a smaller model. Having said that the engine throttles beautifully (beign a 4T) and sounds awesome, it just doesnt pull that hard. If you want something to look and sound scale its a good choice of engine, if you want awesome power to weight and unlimited aerobatics its not imho. Was pulling something like 4300rpm on a 32x18 iirc.
Old 08-12-2006, 01:20 PM
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Default RE: Airframe for Mackay 150 radial

Cheers for that,

That's realy useful to know, wing loading will be my biggest concern.
I'm not looking to 3d it, just scale aerobatics.

Have you seen the video on Airworld USA's site of their SU26.

http://www.airworld-usa.com/sukhoi26mx.htm (click on the video link)

That kind of power to weight would be ok for me.

Didg.
Old 08-12-2006, 03:08 PM
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Default RE: Airframe for Mackay 150 radial

Exactly, at over 44lbs there is no way this is going to be unlimited aeros on the 215cc radial. You would need something like a 200 twin 2T on pipes to get the performance. The 4T 215 radial jsut cant match that. In my experience Airworld kits are top notch for scale detail and outline, a little sloppy on seam lines and moulded in hinges (they had 2 go's at moulding my rudder and neither was straight the top was off fromthe bottom by a full 10mm+). But they tend to be quite heavy!
Old 08-12-2006, 05:02 PM
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Default RE: Airframe for Mackay 150 radial

ORIGINAL: amjflyer
(they had 2 go's at moulding my rudder and neither was straight the top was off from the bottom by a full 10mm+).
Strewth, thats pretty bad, that plus the weight issue would put the airworld out of the equasion for me then.

What about the Composite ARF 2.3m Yak with the 150 in, or would you think this would be a waste of a good airframe.
Give me your honest opinion, I'd like to put one of these radials in somthing (other than a bipe) preferably scale aerobatic,
but I don't want to be just flying circuits, loops and rolls.

Cheers,
Didg.
Old 08-13-2006, 04:06 AM
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Default RE: Airframe for Mackay 150 radial

I think to make it work you need to find an airframe with the lightest possible wing loading and to get the relative wing loading light you would be better going for the 215cc in something weighing around 35lbs or less. Id have thought out of all of the huge number of built up Yaks there are out there one would fit the bill. Perhaps the QQ, or Aviation Models. The 150cc might work in the CArf 2.3 Yak, but my guess is its probably too big physically since the model is designed for a 50cc. I did think if trying that myself just as a fun scale aerobat, but saving the big 2 strokes for the unlimited aerobatics.
Old 08-15-2006, 03:45 AM
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Default RE: Airframe for Mackay 150 radial

Comp' ARF don't have the 2.3 Yak on their web site, perhaps they don't do it any more.
Thanks for all the info though, most appreciated.

Cheers Didg.

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