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"Cox .049 Marine inboard engine."

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Post  NEW222 Sat Dec 23, 2017 10:04 pm

So, as I have never compared the props like this before, I do see some differences. What I do notice is that the DAL prop and the Cox prop appear to be equal at the hub, while the Master Airscrew has a little more 'meat'. Also, the Cox propeller has very pronounced molding cuts on the hub, not as clean cut as the others where taken from the molds.
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Post  roddie Sat Dec 23, 2017 11:33 pm

Here's a comparison between a MA, Cox, DAL and APC

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Can these be used for glow power? - Page 2 Dsc05135

The DAL 5040 props are sold in packages of four (x2 R/H and x2 L/H)

The DAL prop shown above is stamped 5040. It is a R/H propeller. "Not shown" is the L/H propeller which is stamped 5040R. Why "R".. and not "L".. I don't understand.

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Post  Mark Boesen Sun Dec 24, 2017 12:42 am

Can these be used for glow power? - Page 2 I66i8710
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Post  Mark Boesen Sun Dec 24, 2017 12:53 am

Can these be used for glow power? - Page 2 20171211

Here's a prop form the old Super Cub 4.5x4 prop, it also has a fairly thin hub to blade area and its posted right on it not for S Bug or T. Hoppers.
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Post  Surfer_kris Sun Dec 24, 2017 3:38 am

Mark Boesen wrote:Can these be used for glow power? - Page 2 I66i8710

That picture says it all I think, stay safe....



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Post  getback Sun Dec 24, 2017 8:30 am

Well Nuts been running them without a problem !?!? and if you read the product details on the DAL 's it says that there better props than the Gemfan and others .. https://www.dalprops.com/products/5045?variant=15038875523 They also mention tough enough to take crashes and tree limb clipping ? Rudolph But it doesn't say good for IC engines?? while the Gem says that it is Soooo go figure >> I dont care for the Glass filled as i hear there easy breaks , witch tell me too if you get a crack and dont see it after a bad landing then you may bee in for a BAD surprize !! I have had props breck in my hand just trying to start with a S-spring Babe Bee .049
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Post  1/2A Nut Sun Dec 24, 2017 2:49 pm

I use the HQ carbon/nylon blended speed props 4x4.5 and 5x4.5 able to handle 37k thus far from
all my flying with them no issues.  

With the DAL props I think it's all about the new plastic tech, they are using some tough nylon.
I have not used them as of yet. For .049 use you will be just fine as I have used all nylon HQ 4x4.5
with no issues same sort of plastic tech. Went with the carbon blend in the end because I wanted
a stiffer blade for top end speeds thus far 148 mph with no issues. Rudolph


I have never broke a prop using a spring starter Eric, what brand prop did you use that broke?

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Post  roddie Sun Dec 24, 2017 6:07 pm

getback wrote:Well Nuts been running them without a problem !?!? and if you read the product details on the DAL 's it says that there better props than the Gemfan and others ..
 
https://www.dalprops.com/products/5045?variant=15038875523  

They also mention tough enough to take crashes and tree limb clipping ? Rudolph But it doesn't say good for IC engines?? while the Gem says that it is Soooo go figure >> I dont care for the Glass filled as i hear there easy breaks , witch tell me too if you get a crack and dont see it after a bad landing then you may bee in for a BAD surprize !! I have had props breck in my hand just trying to start with a S-spring Babe Bee .049  

Which type/# DAL prop(s) are you running Eric? My DAL 5040's weigh barely 2gr./ea. I just checked the balance on one.. and it's damned near perfect. Much more in-balance than any of my other-brand propellers.

It will be interesting to see how these 5040's run. As I mentioned; my intentions for these props were initially for use on .049 sport engines that weren't expected to exceed 13-14K rpm's... like a stock Cox Babe Bee or Golden Bee. Actually.. what I had in mind where Cox .049 product-engine configurations for small 18-22" span C/L models. Airplanes to be flown on sub-35' lines.

I used 3/16" OD x 3/32" ID silicone fuel line to bush the DAL prop's 5mm hub-hole. This seems like the ideal size. It's a simple matter to thread a 5-40 (Cox .049 size) prop-screw into 3/32" tubing.. and the expansion which takes place yields a nice snug fit inside the prop-hub for perfect centering.

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A Tee Dee .049 style aluminum spinner fits against the DAL prop-hub beautifully... and provides for maximum streamlining.

Can these be used for glow power? - Page 2 Bushin13

I did try a "cam-style" starter-spring with one of these props.. but it was the Cox "old-style" for the round drive-plate. Winding back the spring/prop a sensible amount didn't seem to cause any trouble with the prop. These type of springs are "draggy" though.. and I don't really like using them. As I mentioned; the "zero-drag" springs that hook-around the prop.. I wouldn't use on these.

I'll probably use the TD style spinners and my small electric starter to start engines equipped with these props.

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Post  getback Mon Dec 25, 2017 8:31 am

Which type/# DAL prop(s) are you running Eric? wrote:
I don't have any of the props just making a comparison That 1/2A Nut had been running them . They do look good on that TD spinner !! Small Cox Logo
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Post  roddie Mon Dec 25, 2017 1:34 pm

getback wrote:   They do look good on that TD spinner !! Small Cox Logo  

Yea.. I liked that too! The way I see it; if the pitch flattens-out on these DAL 5040 (5d x 4p) props during operation, I wouldn't think that it would drop below 3" of pitch. A 5 x 3 is actually what I prefer to run on a mild/stock-configured reed-valve .049 engine.

The EMAX 2300/2600KV brushless motors that these DAL FPV props are designed for, see shaft-speeds well in excess of 20K rpms depending on the current/amps that the motor is receiving.

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Post  NEW222 Mon Dec 25, 2017 1:47 pm

I have the DAL 5045BN BullNose propellers myself. I chose those as I thought of them more like the Cox safety tipped propellers by the tips of the blades being blunt and not so rounded.
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