RE: Speed Models,Stinger 21 pic  
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All Forums >> RC Airplanes >> Extreme Speed Prop Planes >> RE: Speed Models,Stinger 21 pic
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RE: Speed Models,Stinger 21 pic - 8/25/2004 4:02:32 PM   
MyWay


 

Posts: 451
Joined: 2/21/2004
From: Benicia, CA, USA
Status: offline 		I know this question has been asked but again what rpm does that engine turn the 7/6w? I run 7/9 apcs on 32s and they turn up 20000+ on the ground. Seems that a 7/6w would be more suited for a 21 size engine.

(in reply to Evil Homer)
       Post #: 26

RE: Speed Models,Stinger 21 pic - 8/25/2004 5:43:21 PM   
Zeroman


 

Posts: 121
Joined: 6/13/2003
From: Vancouver Island, BC, CANADA
Status: offline 		What prop size would you recommend for this engine, plane combination.Jett tank looks like the one that will fit .Thanks Chris.

(in reply to MyWay)
       Post #: 27

RE: Speed Models,Stinger 21 pic - 8/26/2004 3:33:19 AM   
Rudeboy



Posts: 3256
Joined: 12/9/2002
From: Bejing, BELGIUM
Status: offline 		The fuel tank I originally got for my Stinger 40 didn't fit either... but the fuse could be "stretched" just enough in order to get it in... having three hands would sure be nice sometimes...
If all else fails you could grind the wing saddle a little... there's some extra material there (at least on the 40 there is)

Anyway, the Bubble Jett tanks are the way to go on this kind of plane. I went that route too, as it will probably save me some headaches later on. Can't go wrong with a Bubble Jett (if you fuel it the right way at least).

How's your wing by the way? Mine was not perfect. I think the cores were cut too fast or with too cold a wire or with not enough tension on the wire (or a combination of these). Nothing dramatic, but still... for the money they could have gotten that right.

Props...
I don't think you should worry too much about them. MyMay is probably on track.
The biggest worry you will have is that muffler. It is going to be impossible to get decent rpm/power on that can... Get a pipe or a Jett Stream muffler, and let it breathe.

_____________________________

Revver Brother #33
...I think it needs more power...

(in reply to Zeroman)
       Post #: 28

RE: Speed Models,Stinger 21 pic - 8/26/2004 5:36:09 PM   
MyWay


 

Posts: 451
Joined: 2/21/2004
From: Benicia, CA, USA
Status: offline
quote:

ORIGINAL: Zeroman

What prop size would you recommend for this engine, plane combination.Jett tank looks like the one that will fit .Thanks Chris.

I would start out with an 8/7 apc using your muffler, 8/8 if you go to a tuned pipe. These will allow you hand launch with ease. If you want speed, go with an apc 7/9 with muffler, 7/10 with tuned pipe. With the speed props you will loose launch ability so be aware of this. If you can get by the launch, hold on, because these high pitched props will really unload as the plane picks up speed.

(in reply to Zeroman)
       Post #: 29

RE: Speed Models,Stinger 21 pic - 8/27/2004 7:47:19 AM   
der_steuermann



Posts: 238
Joined: 11/7/2002
From: Stolberg, GERMANY
Status: offline
quote:

ORIGINAL: MyWay

If you want speed, go with an apc 7/9 with muffler


Hmmmm - definitely too much prop when using the muffler , will not unload adequately without pipe



Zeroman, as suggested by others before please demount the muffler. It does really not
go with a serious speed plane application. Your engine has to rev and it likes to rev!
If you have to suffer from noise restrictions then you might try this:

MACS side exhaust header (small radius) # 2340
MACS Muffled Tuned Pipe # 1230
again APC prop 7.2X8.6 # LP07286
pipe length (from glow plug to the deflector plate in the pipe) = begin with 12" (to be shortened)

Later, you can always check out higher pitched props like an APC 7*10 being cut down to 6.5" in diameter.




Rudeboy,

what is the exact weight of your Jet .50 BSE ? - Just engine with carb and spinner assy, but without header)

Thanks in advance


(in reply to MyWay)
       Post #: 30

RE: Speed Models,Stinger 21 pic - 8/27/2004 2:55:38 PM   
bob27s



Posts: 4821
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		If I may assist with that weight question....

The Jett BSE .50 AAC side exhaust, with the muffler and spinner nut is 16.8oz (476 g) on average. Comes in right at 17 oz with the ABC liner.

The complete AAC engine with prop nut only is 12 oz. Muffler weighs 4.8 oz

Maybe Rudeboy has a gram scale and can confirm these.

Bob


_____________________________

Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to der_steuermann)
       Post #: 31

RE: Speed Models,Stinger 21 pic - 8/27/2004 6:29:51 PM   
Rudeboy



Posts: 3256
Joined: 12/9/2002
From: Bejing, BELGIUM
Status: offline 		Jett BSE FIRE .50, ABC, 2" counterbalanced spinner, standard backplate, including throttle body, remote needle valve and plug: 422 grams (give or take 2 grams)

Attachments
Click to see fullsize image.
Click for fullsize


_____________________________

Revver Brother #33
...I think it needs more power...

(in reply to bob27s)
       Post #: 32

RE: Speed Models,Stinger 21 pic - 8/27/2004 7:48:15 PM   
bob27s



Posts: 4821
Joined: 4/9/2002
From: Cleveland, OH, USA
Status: offline 		yeah, thats about right with the spinner. It is handy having the integral spinner assembly.

Dub told me earlier he finally finished the 2.25" spinners and has them ready to ship. Should be popular with the Patriot XL guys.


_____________________________

Bob Brassell
Jett Engineering - Engine Mfg Support Forum Host

(in reply to Rudeboy)
       Post #: 33

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