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Old Mar 18, 2012, 09:34 AM
heritageflyer is offline
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Time to Fly AJ's Best!
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Originally Posted by theKM View Post
there's factors that go into all this that have to do with the production side of the operation... but ultimately we know the issue, trying to make changes to get on top of it.
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Old Mar 18, 2012, 01:34 PM
Ace4 is offline
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Stick banger
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Originally Posted by hugocraft View Post
Lost a wheel collar on the 87shp and didn't know until after I landed. The wheel pant kept the wheel on. I got some 5/16" wheel collars but they almost fit. I think the axle is 8mm which I don't think dubro or great planes doesnt make. I tried to drill out one of the collars but I took out too much. Guess I need an 8mm drill bit.

I ordered some new sulivan 4" wheels w/ alum hubs from the lhs but they won't be in until monday but have no clue what size the hole will be on those. I'm just trying to get it ready to fly for the weekend. I picked up some 5/16" wheel axles which work great with the collars I have but shaft is pretty small for the wheels already on the plane. Also those axles won't work with the wheel pants since the bolt on part/threads are not long enough.
The stock 87 SHP wheels are 3.5", or at least that's what mine have written on them. If it's 8mm (I never measured mine), try looking at smaller heli shaft collars, some of the 500 and below size helis use an 8mm mainshaft and they have collars to hold it in place.
Old Mar 18, 2012, 02:57 PM
SteveT. is online now
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I fly, therefore, I crash!!!
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Would anybody have four 4mm blind nuts (I.E. like the ones in a 3DHS motor box they would part with, I need four please.....

Thanks

SteveT
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Old Mar 18, 2012, 05:57 PM
keithy4129 is offline
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Originally Posted by SteveTtoooo View Post
Would anybody have four 4mm blind nuts (I.E. like the ones in a 3DHS motor box they would part with, I need four please.....

Thanks

SteveT
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Old Mar 18, 2012, 07:37 PM
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I fly, therefore, I crash!!!
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Thank you Keith...

SteveT
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Latest blog entry: My hangar...
Old Mar 18, 2012, 07:46 PM
Futile flight is offline
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i have a question it might be a dumb one


I've wonder with 100cc aircraft do can's and add perforamacne or are they just sound deading and extra weight ?
Old Mar 18, 2012, 08:04 PM
quadracer is offline
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No, I won't ship it. Don't ask
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Quote:
Originally Posted by Futile flight View Post
i have a question it might be a dumb one


I've wonder with 100cc aircraft do can's and add perforamacne or are they just sound deading and extra weight ?
I'm no expert, but just about any internal combustion engine will benefit from back pressure created by the can. with no can, there is no pressure to send the piston back down for the next stroke.
Old Mar 18, 2012, 08:05 PM
aronph is offline
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TEAM HILLBILLY
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Originally Posted by quadracer View Post
I'm no expert, but just about any internal combustion engine will benefit from back pressure created by the can. with no can, there is no pressure to send the piston back down for the next stroke.
combustion sends the piston down every stroke
Old Mar 18, 2012, 08:10 PM
quadracer is offline
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No, I won't ship it. Don't ask
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Yes, it does, but I know when I run my motorcycle and quad with no can, it has zero power. They will run, but there's just no "grunt."
Old Mar 18, 2012, 08:11 PM
jsmith285 is offline
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Perspective
Old Mar 18, 2012, 08:12 PM
SteveT. is online now
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I fly, therefore, I crash!!!
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Please see this site for a basic explanation of how a tuned pipe (expansion chamber/helmholtz resonator) works...

A "can" muffler works somewhat the same, but is not as "peaky" nor does it need to be tuned to the engine, like a true tuned pipe does..

And no, sorry, the back pressure from a tuned pip does not push the piston back down...

SteveT
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Old Mar 18, 2012, 08:14 PM
aronph is offline
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TEAM HILLBILLY
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how did you teach that midget to hover?....oh wait... :-)
Old Mar 18, 2012, 08:17 PM
SteveT. is online now
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I fly, therefore, I crash!!!
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Quote:
Originally Posted by aronph View Post
combustion sends the piston down every stroke
Actually every second stroke in a two stroke engine, and every fourth stroke in a four stroke or every eight stroke in a "hit and miss" engine, which is an eight stroke engine.... (A stoke of course is either up or down)

How even a simple two stroke engine (be it port timed or reed valve induction) can take a long post to explain...so we won't go there....

But this site has a simple animation...

SteveT
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Last edited by SteveT.; Mar 18, 2012 at 08:38 PM.
Old Mar 18, 2012, 08:31 PM
3DNater is offline
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3d NOOBular
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That animation is sweet.
Old Mar 18, 2012, 08:32 PM
HugoCraft is offline
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Aerobatic Fanatic
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Sorry PB that we didn't come out and fly with you today. I got "diggity2424" all excited when I would hover the 87shp side by side with his 74" Edge.

The 87shp is mine and the rest belong to "diggity2424"


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