1/2A or .10 Shrike for MVVS .15?
05-29-2007, 02:16 PM
#3
RE: 1/2A or .10 Shrike for MVVS .15?
I can't speak first hand about the Shrikes. What I can tell you is that if you use HS 65 servos, 300 mah nimh battery, Berg RX, 2 oz tank, and a 6.5 oz engine, it is possible to come up with a RTF plane that weighs in the low 20 oz range. Base your wing loading on that. I'll bet a 1/2A Shrike can accomodate that much weight, but the better all around flyer will still be the .10 sized bird. I just finished building a similar setup, but with a fat wing and it is a blast.
05-29-2007, 05:06 PM
#6
RE: 1/2A or .10 Shrike for MVVS .15?
Thanks, PT. You're right, I built it out of some old C/L combat prefab parts laying around, this basic wing usually carries a FOX .36 Combat Special. It isn't fast, but it is very quick. Next move is to install a servo that steers the engine.
05-29-2007, 06:09 PM
#7
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RE: 1/2A or .10 Shrike for MVVS .15?
I was/am going to stuff an MVVS .15 in a 1/2A Shrike... I did the math, like CP just did, and IMO it is perfectly possible. You don't even need a throttle servo...
Don't forget they also list that plane for Speed 400 power... do the math with a big chunk of battery and a Speed 400 motor upfront... I bet it will come out heavier than an MVVS .15 powered plane, and it will only have half the power of a glow .15. So if that flies, then a .15 powered plane will certainly fly.
So go for it.
I really need to finish mine... should be a blast. My little MVVS is ready: turning a 5.5x5.5 at 25800 rpm rich... that should haul the mail
Talking about props: you don't need a 7" blade for a plane that size. The MVVS should have no trouble with something like a 6x6, if you want to keep it at about 19000rpm. A little more pitch might give you a little more speed.
Don't forget they also list that plane for Speed 400 power... do the math with a big chunk of battery and a Speed 400 motor upfront... I bet it will come out heavier than an MVVS .15 powered plane, and it will only have half the power of a glow .15. So if that flies, then a .15 powered plane will certainly fly.
So go for it.
I really need to finish mine... should be a blast. My little MVVS is ready: turning a 5.5x5.5 at 25800 rpm rich... that should haul the mail
Talking about props: you don't need a 7" blade for a plane that size. The MVVS should have no trouble with something like a 6x6, if you want to keep it at about 19000rpm. A little more pitch might give you a little more speed.
05-29-2007, 06:45 PM
#8
RE: 1/2A or .10 Shrike for MVVS .15?
Rudeboy, that sounds like a killer set up. My .15 sized speed attempts have all been disappointing, they sound like they're doing 140, but actually only doing about 90........if that.
I have only messed with the OS CV .15, ST .15 and Taipan .15. I have been thinking about treating myself to a Cyclon next year. Those engines are a good investment because they are hard to blow up or wear out.
I have only messed with the OS CV .15, ST .15 and Taipan .15. I have been thinking about treating myself to a Cyclon next year. Those engines are a good investment because they are hard to blow up or wear out.
05-29-2007, 08:21 PM
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RE: 1/2A or .10 Shrike for MVVS .15?
Talking about MVVS engines: if I have to believe the Dutch importer of these little gems, MVVS has discontinued production of their small engines (.12 to .21)
Time to start buying up some stock!!
Time to start buying up some stock!!
05-30-2007, 09:55 AM
#10
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RE: 1/2A or .10 Shrike for MVVS .15?
Rudeboy,
Be prepared to add weight with a .15 because it will be very nose heavy. I built a 1/2 Shrike with a .8 oz Littte Screamers park jet motor. With a 3 cell 1320 lipo, AUW is 11.2 oz and is pefectly balanced with the battery in the center of the fuse. There is very little room in the 1/2 size to move things around. With a 2 oz motor, i would have had to add weight to the tail.
Let us know how it goes.
BTW, the 1/2a Shrike with the LS motor and a 4.75x5.5 prop is more of a "pucker" airplane the a .10 Shirke with an O.S .32.
Grodus
Be prepared to add weight with a .15 because it will be very nose heavy. I built a 1/2 Shrike with a .8 oz Littte Screamers park jet motor. With a 3 cell 1320 lipo, AUW is 11.2 oz and is pefectly balanced with the battery in the center of the fuse. There is very little room in the 1/2 size to move things around. With a 2 oz motor, i would have had to add weight to the tail.
Let us know how it goes.
BTW, the 1/2a Shrike with the LS motor and a 4.75x5.5 prop is more of a "pucker" airplane the a .10 Shirke with an O.S .32.
Grodus
05-30-2007, 10:58 PM
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RE: 1/2A or .10 Shrike for MVVS .15?
Well, I was going to modify the fuselage anyway, to accomodate the straight RE tuned pipe and the bigger than "normal" engine... I have the fuse sides cut: gave it a little more belly to keep the engine on centerline, and have ability to fit a 2oz tank. I also shortened the nose a bit.
You're flying lipo's... back when the Shrike was designed, lipo's didn't even exist. You were supposed to fit a 6 or 7 cell nicad pack in there back in those days... what would that do to your balance...?
I agree though, the smaller the plane, the better the thrill: it may only do 100, but it looks and feels like 200!!!
You're flying lipo's... back when the Shrike was designed, lipo's didn't even exist. You were supposed to fit a 6 or 7 cell nicad pack in there back in those days... what would that do to your balance...?
I agree though, the smaller the plane, the better the thrill: it may only do 100, but it looks and feels like 200!!!
