Sundowner 50: MAgnum .70  
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All Forums >> RC Airplanes >> Extreme Speed Prop Planes >> Sundowner 50: MAgnum .70 Page: [1]

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Sundowner 50: MAgnum .70 - 6/2/2008 8:31:33 AM   
Axel40


 

Posts: 106
Joined: 4/5/2008
From: London, UNITED KINGDOM
Status: offline 		Guys, I asked this in the Sundowner thread and it didn't get a reply so I'll ask again to see if I can get an answer.

I will be putting in a Saito 1.00 into the SD soon enough but right now I am stuck with a Magnum .70 4 stroke but I will make do

I never really flown a plane specifically made for speed so all this 'propping' is quite new to me.

I just need a ballpark figure on a prop, somewhere to start. I mean, when I'm looking for a prop on my Hellcat I just think, "yea14x8, 15x6, that will do fine" and it is.

These things I hear people going for 10x10, 9.5x9 and so on.

So what should I try to get me in the ballpark please?

       Post #: 1

RE: Sundowner 50: MAgnum .70 - 6/2/2008 12:18:36 PM   
MuSo


 

Posts: 14
Joined: 4/22/2004
From: FuengirolaMalaga, SPAIN
Status: offline 		Usualy 4 strokes are made for torke, not for speed, saito usualy gets around 10k rpm thats is almost the limit of the engine rpm, even you put a 8x8 you cant get more than 12k rpm.

If you want speed put a OS 91 FX with a 10x10 and then you will have speed, rpm´s, noise, big fun.....
Just my opinion.


< Message edited by MuSo -- 6/2/2008 12:19:27 PM >

(in reply to Axel40)
       Post #: 2

RE: Sundowner 50: MAgnum .70 - 6/2/2008 2:52:27 PM   
Axel40


 

Posts: 106
Joined: 4/5/2008
From: London, UNITED KINGDOM
Status: offline 		Yep, point taken but that's what I have to hand.

A OS 91 would be good but I don't have one to hand

I just thought someone would have a rough idea on the sort of prop for the Magnum .70 that I have just this minute installed in the plane.

(in reply to MuSo)
       Post #: 3

RE: Sundowner 50: MAgnum .70 - 6/2/2008 4:41:26 PM   
darren94


 

Posts: 52
Joined: 3/4/2007
From: Charlottesville , VA, USA
Status: offline 		I just hit 130 on a non broken Jett 60 LX motor on my maiden flight. Superb power and very light weight!!

(in reply to Axel40)
       Post #: 4

RE: Sundowner 50: MAgnum .70 - 6/2/2008 4:42:15 PM   
Flyboy Dave



Posts: 13467
Joined: 3/20/2002
From: San Bernardino County, CA, USA
Status: online 		....you are going to be very disappointed in the performance of the plane
with that engine. A 12-7 prop is about all it will pull. You'll get about 60
MPH out of it.

FBD.

_____________________________

An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
"Old Age, and Treachery will overcome youth and skill".
Revver Bro #4.

(in reply to Axel40)
       Post #: 5

RE: Sundowner 50: MAgnum .70 - 6/2/2008 5:41:47 PM   
Axel40


 

Posts: 106
Joined: 4/5/2008
From: London, UNITED KINGDOM
Status: offline
quote:

ORIGINAL: Flyboy Dave

....you are going to be very disappointed in the performance of the plane
with that engine. A 12-7 prop is about all it will pull. You'll get about 60
MPH out of it.

FBD.


Seriously, that is fine for now.

I just loved the looks of this plane and wanted it, even if I didn't have an engine that would do it justice!


I'm pretty much built so I'll make do until I get another engine in then I'll have to get another plane to take the .70 4 stroke


Thanks guys.

(in reply to Flyboy Dave)
       Post #: 6

RE: Sundowner 50: MAgnum .70 - 6/2/2008 6:04:26 PM   
bob27s



Posts: 4831
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline
Just build it and fly it with the .70 up front.

The plane will fly great........ and that is the most important part....


_____________________________

Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to Axel40)
       Post #: 7

RE: Sundowner 50: MAgnum .70 - 6/2/2008 6:35:18 PM   
panzerd18



Posts: 262
Joined: 10/3/2005
From: RomseyVictoria, AUSTRALIA
Status: offline 		Axel40 would the Magnum 90 4 stroke fit? on the mounts?

(in reply to bob27s)
       Post #: 8

RE: Sundowner 50: MAgnum .70 - 6/2/2008 7:26:43 PM   
Axel40


 

Posts: 106
Joined: 4/5/2008
From: London, UNITED KINGDOM
Status: offline 		Bob, That's the plan.


I just wanted to know the best prop for the job.

I have a few so I guess I'll experiment, part of the fun anyway. The plane is just so beautiful to look at, guess I was seduced It's sitting behind me, on the bed and it looks fast not moving.

BTW, I notice you let 'The Stig' fly mine, thank you (pilot figure)


Sorry Panzered, I dont have a .90 Mag to check.

(in reply to panzerd18)
       Post #: 9

RE: Sundowner 50: MAgnum .70 - 6/5/2008 11:59:26 PM   
rexracer


 

Posts: 254
Joined: 1/23/2006
From: New Milford, CT, USA
Status: offline 		There's a Revolver thread in the ARF forum, and one of the guys has a saito .82 turning a 13x8 APC and he radar'd his plane at 113mph on the flat. Confirmed by doppler/video. That's about 40% faster than the theoretical pitch speed. I say put an 8 pitch prop on that thing that will give you 9500-10000 rpm on the groung and go fly.

_____________________________

Club Saito member #173

(in reply to Axel40)
       Post #: 10

RE: Sundowner 50: MAgnum .70 - 6/6/2008 4:32:41 AM   
wings 540



Posts: 206
Joined: 6/9/2007
From: , WA, USA
Status: offline 		how do you guys thing this plane would perform with the recomended electric motor in it? (e-flite power 46) i have never had a speed plane before so do you think this would be a good first speed plane. i am planning on useing the elecric option, or would it be worth it to get the glow set up. and would it be aceptable to use a spektrum DX6 for this plane? i know the manual says not to, but i have flown other planes up to 350+ feet with no problems.

thanks

(in reply to rexracer)
       Post #: 11

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