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Old Jan 13, 2011, 01:28 AM
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ronaldf's Avatar
Oakhurst, CA
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Originally Posted by Prof100 View Post
Do you have a local source for birch dowels? If so, see if you can find one that fits and use it.
http://cgi.ebay.com/ws/eBayISAPI.dll...E:L:OU:US:1123

I'm going to replace the CF with the wood until I can find solid CF with decent shipping costs. I just can't justify paying more for the shipping than the CF rod.
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Old Jan 13, 2011, 11:08 AM
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West Texas USA
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Spar reinforcement.

Quote:
Originally Posted by Prof100 View Post
Do you have a local source for birch dowels? If so, see if you can find one that fits and use it.
Thanks. I agree the CF shipping is too expensive. I will try to get a birch dowel and go from there. Next time I will look at the I.D. of the spar by inserting a drill bit before ordering blindly. I didn't think of the drill bit measuring option. Duh. Apparently the spar specs do vary between vendors or batches. Sounds like their QA or QC could improve.
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Old Jan 13, 2011, 11:17 AM
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Canton, Michigan USA
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Originally Posted by garymcc View Post
Thanks. I agree the CF shipping is too expensive. I will try to get a birch dowel and go from there. Next time I will look at the I.D. of the spar by inserting a drill bit before ordering blindly. I didn't think of the drill bit measuring option. Duh. Apparently the spar specs do vary between vendors or batches. Sounds like their QA or QC could improve.
ID or wall thickness is not controlled based on your sample and mine.
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Old Jan 13, 2011, 12:45 PM
Just Me
United States, OR, Salem
Joined Apr 2006
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Quote:
Originally Posted by ronaldf View Post
http://cgi.ebay.com/ws/eBayISAPI.dll...E:L:OU:US:1123

I'm going to replace the CF with the wood until I can find solid CF with decent shipping costs. I just can't justify paying more for the shipping than the CF rod.
Go to your local Wally Mart store...buy an CF arrow...about 3-4 dollars....
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Old Jan 13, 2011, 07:59 PM
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Joined Apr 2010
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Weight With Reenforcements

I already have carbon fiber rods embedded in my Sky Surfer wings and this week I added 3mm rods to top of fuselage from wing to tail and on the bottom from forward cooling hole to aft tail prominence. Also added short (10") rods on each side under cockpit and first half of wing. Very sturdy and stiff now. Weight went up from 22 to 23 oz.

(To make up for the increased weight, I increased the plane's general efficiency by putting the prop on correctly! Thanks.)

Clay
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Old Jan 13, 2011, 09:36 PM
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ronaldf's Avatar
Oakhurst, CA
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Originally Posted by Brner View Post
Go to your local Wally Mart store...buy an CF arrow...about 3-4 dollars....
Thanks for the tip.
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Old Jan 13, 2011, 09:47 PM
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Canton, Michigan USA
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Originally Posted by ronaldf View Post
Thanks for the tip.
I just looked up arrows at Walmart and the prices for four were over $100. Most were around $130. I found no $4 arrows of any sort. I suspect the arrows are fiberglass, not CF. Arrows are over 6 mm as well and suspect more like 8 mm or more. Larger arrows or CF would require opening up the foam to accept it.
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Old Jan 13, 2011, 11:44 PM
Just Me
United States, OR, Salem
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Quote:
Originally Posted by Prof100 View Post
I just looked up arrows at Walmart and the prices for four were over $100. Most were around $130. I found no $4 arrows of any sort. I suspect the arrows are fiberglass, not CF. Arrows are over 6 mm as well and suspect more like 8 mm or more. Larger arrows or CF would require opening up the foam to accept it.
You must shop at a different Walmart than I do Prof. I just bought four of them for $4/each (or close to that)....
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Old Jan 14, 2011, 12:21 AM
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Manitoba, Canada
Joined Oct 2010
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Motor Mod

I got my SS for Xmas and want to upgrade the stock 2620KV brushless motor. I have heard that the brushless RCTimer 2200KV #2826-6 or #2212-6 both make good upgrades. RCTimer seems to have the same specs listed for both motors. Any suggestions which one is better for the SS? I don't want to turn it into a jet but I would like something with a bit of oomph.

I don't understand why the brushless 2200KV with 6x4E prop would be an upgrade to the stock brushless 2620KV and 5x8 Excellent prop.
Here is my understanding (or misunderstanding) of the science...

(1) The stock 2620KV spins faster than the 2200KV.
(2) The stock 5x8 prop makes the plane travel about twice as far per revolution as the 6x4 prop.

So how does getting a lower KV motor and a prop that must spin twice as much to make the plane travel the same distance improve the plane's performance? Can someone help me understand this before I go buying a motor that turns my SS from a seagull into a chicken? I am using a 3S 1800 maH Lipo battery.

I also want to mount the new motor in such a way so I don't have to open the fuselage everytime I want to chang the motor. Anyone have any pics showing how they have mounted the motor?
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Old Jan 14, 2011, 05:29 AM
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Canton, Michigan USA
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Quote:
Originally Posted by Brner View Post
You must shop at a different Walmart than I do Prof. I just bought four of them for $4/each (or close to that)....
I just checked Walmart on line. No store visits.
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Old Jan 14, 2011, 07:39 AM
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Alabama
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Quote:
Originally Posted by Prof100 View Post
I just checked Walmart on line. No store visits.
The ones you saw there is actually for a dozen (like $175, right?). Those are some super high quality type and not what you would want to buy, but I'm not sure they have the cheaper ones online. If you go to a store this time of year, actually a bit earlier than this time of year, you will find several boxes of carbon and aluminum and some fiberglass arrow shafts that you can buy individually for less than $5 each. But they are often a seasonal offering only. But go to any sporting goods store and you can probably buy the same thing year round. If you have a friend who bow hunts he may even give you one.

I think the diameters of carbon fiber arrows range from about 6-8mm, so you are right that there may be some reaming involved to get a larger one to fit.
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Old Jan 14, 2011, 10:34 AM
Just Me
United States, OR, Salem
Joined Apr 2006
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Yep....got mine from a local store visit. Checked the online ads and the ones advertised are super high quality type (very expensive) as Stud says above. When I bought mine they had a box full of mixed type and I had to pick through a few, but they are cheap and well worth the trip. Remove the tip and the fletching and you have a nice re-inforcement tube. I'll check the OD, ID and length later and post back here.....
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Old Jan 14, 2011, 12:24 PM
Just Me
United States, OR, Salem
Joined Apr 2006
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OK....here's the spec's on the arrow shafts I bought.

ID = 5.6mm
OD = 7.3mm (prox. .28")
Length ~ 30"

These measurements were taken with my handy dandy HF digital caliper so I do not testify to the extreme accuracy of same. Your results may vary. However, for the purposes of this thread, they are plenty close enough. Additionally, if you break one of these during flight, you're flying too dang fast and/or too reckless....lol

As noted above, I do believe that these shafts are seasonally available, so would suggest that if you find them available, pick up a years supply.
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Old Jan 14, 2011, 05:31 PM
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Miami, FL
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How many people have reported their wings snapping? There seems to be an awful lot of concern from everyone about this happening.
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Old Jan 14, 2011, 05:44 PM
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Canton, Michigan USA
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Originally Posted by airbagit13 View Post
How many people have reported their wings snapping? There seems to be an awful lot of concern from everyone about this happening.
I have not but mine was reinforced from the start but when a elevator servo pot went crazy and the elevator went up in down by itself the wings flapped up and down like a seagull . Without the reinforcement the stock spar would have snapped. The up down deflection was about a foot at the wingtips.

As AJ mentioned in the beginning of this thread the reinforcement is mandatory if you plan on flying aerobatic maneuvers. If you don't then you should be OK unless you have a hard landing and whack the wing and break the spar.
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