Can these be used for glow power?

Yes you can, tough props good quality but blade is a bit wide adds load!
I have those in black. Camber in the airfoil produces more thrust.
Requires a TD .049 and Norvel  .049 /.061 and with the .074 (speed)

https://www.ebay.com/itm/12-pcs-6-pair-GemFan-Carbon-Nylon-5x4-5-5045-Propeller-6-CW-6-CCW/252679526450?_trkparms=aid%3D555017%26algo%3DPL.CASSINI%26ao%3D1%26asc%3D41376%26meid%3D2538b08af056400491e9c3a61479e4aa%26pid%3D100507%26rk%3D1%26rkt%3D1%26&_trksid=p2045573.c100507.m3226






Prefer the HQ Prop Carbon Speed Tip 5x4.5 better blade design.

I tried out some that are similar with decent results. I dont have them on me, so I will see if I can dig up a picture to put here. Please bear with me and I'll see what I can get.

Ok. So, I was wrong. I had the engine here. So here is a picture with my DAL Prop 5045 in green. It is the Bullnose as it has a heavy hub. That is why I chose this one. Another I heard works well is Kong Propellers. The only thing I had to do to get it to work is bush the prop hub with small fuel tubing. LInk for the props as well.

https://www.dalprops.com/products/5045?variant=15038875523

Thanks for the replies. It is sold in pairs left handed and right handed. It comes in several sizes and colors. They also sell plastic props and lists it as strictly for Quad copters.

NEW222 wrote:Ok. So, I was wrong. I had the engine here. So here is a picture with my DAL Prop 5045 in green. It is the Bullnose as it has a heavy hub. That is why I chose this one. Another I heard works well is Kong Propellers. The only thing I had to do to get it to work is bush the prop hub with small fuel tubing.

LInk for the props as well.

https://www.dalprops.com/products/5045?variant=15038875523

Are the DAL part#'s representative of the diameter/pitch? IE: a 5045= 5"D x 4.5"P ?? I would assume that to be true. Looking through their stock, it appears that "all" the propellers listed have a minimum 4" pitch regardless of diameter.

I like the idea of being able to buy a set of four 5" two-blade propellers (two R/H and two L/H) for less than $2.. The L/H props are useful for reed-valve engines.

I'd be particularly interested in trying the #5040 prop to test on my Cox .049 reedies.



They're currently listed at $1.89 for the set. That's $.50/propeller!!! The amazingly low-price of these propellers can be directly attributed to the quad-copter/drone craze that we're seeing these days.

I don't know, some of those props are really thin especially at the hub, i'd like to see what Ken has to say? Maybe the thicker ones on a Sure Start, but no way on a Tee Dee?

Mark, I have had no experience with these smaller props shown. I agree with your statement. I see Brad though has used the HQ props successfully. I also noted that most of those were carbon composites. I would just extreme caution when experimenting. Even though these engines are small, they can inflict serious injury in the event of a failure. I would give them a try and if they do prove worthy, this is certainly a plus due to the 1/2A prop sizes available today. It's apparent that were not supposed to be using them due to the pulses of a combustion engine. Ken

Rather than rely on age, wisdom, experience or hearsay, I e-mailed the manufacturer DAL-props and this was the reply:

“Yes, these propellers can be used for both electric and glow engines.  
DAL Props come with a 5 mm hole for the 5 mm shaft diameter on the
electric motors used on quad copters.  The shaft diameter for COX
engines is smaller.  So you would need an adapter ring like those that
are included with APC props.  But we do not supply these.  There is
another difference.  For props used in fuel (glow, nitro, etc) engines,
the hub region is beefy so that the prop can be used to start the engine
(whether by hand or w/ an electric starter).  For electric propellers,
beefing up the inner prop region is not required.  So you will find some
electric props with thin blades near the hub.  But the DAL Props are
beefy (because we build them to take a beating), so then can be torque
started on glow engines.

I hope that helps.”


Ok, now just so you know.

Marleysky wrote:Rather than rely on age, wisdom, experience or hearsay, I e-mailed the manufacturer DAL-props and this was the reply:

“Yes, these propellers can be used for both electric and glow engines.  
DAL Props come with a 5 mm hole for the 5 mm shaft diameter on the
electric motors used on quad copters.  The shaft diameter for COX
engines is smaller.  So you would need an adapter ring like those that
are included with APC props.  But we do not supply these.  There is
another difference.  For props used in fuel (glow, nitro, etc) engines,
the hub region is beefy so that the prop can be used to start the engine
(whether by hand or w/ an electric starter).  For electric propellers,
beefing up the inner prop region is not required.  So you will find some
electric props with thin blades near the hub.  But the DAL Props are
beefy (because we build them to take a beating), so then can be torque
started on glow engines.

I hope that helps.”


Ok, now just so you know.

I wonder if that applies to all their props.
If they are all suitable for glow engines, the little three bladers might go ok on a Pee Wee.

Careful selection is the key the plastic tech used by the drone prop makers is getting very
competitive these days with high performance design mixes.  Avoid ABS you need nylon
or exotic variant types with glass fibers or carbon blend or all carbon weave is doable providing
the weave is integrated into the hub that cross feeds to the opposing blade.

I have had success with all 4 types flying at extreme speeds, again avoid 100% ABS
not worth the risk. A spring starter will bite into a soft material prop every time maring
denting in the trailing edge and airfoil face.

The .010 and .020 can turn up some serious rpm examine if the airfoil is thicker at the hub
for the smaller props. For .049 and up best seek out only quality materials and design.  

A stiff prop will put the wammy to the crank shaft, pin and ball socket if you crash. Med flexible
blades will always be kinder to the engine if you smack the ground. I have snapped APC IC prop
blades right off the hub it is brutal on the engine so far my .049 - .061 have survived.

Large dia. props for thrust should always be well selected to not ruin the engine nor fail.
Experienced operators always watch for stress fractures / color changes near the hub regardless of brand.

The information above is not meant for youngsters or newbies to the hobby.
Best to always learn the ropes with Cox brand props first with all Cox engines.  

Well. Thanks for contacting the manufacturer. It is great that they acknowledged us and what we need the props for. They are indeed very beefy near the hubs, and pretty flexible. I just looked at it, and it does appear to flex on par with the yellow Cox propeller. Without a full chemical analysis, we will never know. I am still going to continue using my favorite Cox Yellow safety tipped propellers. These were just a thing I wanted to try for myself, and the pitches offered are not good for me and how I fly.

roddie wrote:

NEW222 wrote:Ok. So, I was wrong. I had the engine here. So here is a picture with my DAL Prop 5045 in green. It is the Bullnose as it has a heavy hub. That is why I chose this one. Another I heard works well is Kong Propellers. The only thing I had to do to get it to work is bush the prop hub with small fuel tubing.

LInk for the props as well.

https://www.dalprops.com/products/5045?variant=15038875523

Are the DAL part#'s representative of the diameter/pitch? IE: a 5045= 5"D x 4.5"P ?? I would assume that to be true. Looking through their stock, it appears that "all" the propellers listed have a minimum 4" pitch regardless of diameter.

I like the idea of being able to buy a set of four 5" two-blade propellers (two R/H and two L/H) for less than $2.. The L/H props are useful for reed-valve engines.

I'd be particularly interested in trying the #5040 prop to test on my Cox .049 reedies.



They're currently listed at $1.89 for the set. That's $.50/propeller!!! The amazingly low-price of these propellers can be directly attributed to the quad-copter/drone craze that we're seeing these days.

Hey there roddie. The props you show here are a different model than the ones I show, and have. I do recall seeing and looking at that propeller, but the hub was not strong enough to me by looking. To me, personally, the 'Bullnose' props appeared to have the heavier hub of both and is why I chose such. If, however, you do try out the ones you show, I myself, would be interested in your results. But, now after confirmation from the company, I think any would be ok.

Hey "Chancey" and "Rene".. Thanks.. for your research/responses! I could use some extra sport-props for my stock Cox reed-valve Cox .049 engines. These engines are pretty "tame".. so I might give the DAL props a try. They'd surely be economical.. if they hold-up. I particularly like the "left-hand" options for testing stunt-flight characteristics between the opposite rotations. It would be fun to experiment with a decent-flying C/L 1/2A design.. like a Sig "Skyray", Goldberg "Stuntman 23" or similar, to see how they fly with opposite-rotation propellers. It might require building a small wingtip-weight box.. for running the R/H props.. but that would be a minimal modification to the airframe.

I just ordered some DAL propellers of the "5040" 2-blade spec. I'll report on their initial appearance when I receive them. I'm kinda' "psyched".. because I'd forgotten about this thread.. and the idea of trying-out these propellers. We won't know how they perform on our Cox engines.. unless a few of us try them out. I'd assume that a hub-bushing to bush their 5mm hub-hole can be accomplished in the same way that many of us have bushed the hubs of the APC props in this size-range; by using a piece of silicone fuel-tubing. I'd rather use hard-tube bushings.. but we'll have to see what the options are.. without drilling-out the hub.

I myself have used fuel tubing on the propeller screw so far to bush these.

Yes fuel tubing is your friend I always use it whenever possible to insure good centering
before the prop binds down on the thrust plate.

1/2A Nut wrote:Yes fuel tubing is your friend I always use it whenever possible to insure good centering
before the prop binds down on the thrust plate.

Yes.. it's just something I'd never done before reading about it "here" on the forum. It's possible that it could also offer some harmonic-balancing.. couldn't it?  

I ordered four of the DAL 5040 2-blade "black" prop sets. That's 16 props.. (8 rights and 8 lefts..) for $10 and change; including shipping.

I'll also be visiting a hobby shop while on a trip to Sturbridge, MA this weekend.. (Hog Heaven Hobbies) I could use some more silicone fuel-tubing in various sizes. This shop has been in business for decades.. but it's been ten years since I've been there. I can't remember ever inquiring about any NOS Cox parts.. so I'll ask while I'm there. You just never know.

There "was" a hobby shop not too far from where I "now" live (Northern Rhode Island). "Apple Valley Hobbies" in Smithfield, closed a few years ago. They were in business since 1939! Living most of my life in Massachusetts; I didn't know of this RI shop previously. I chanced to be in the area.. to notice their "going out of business" signs on the store-window one day. Everything was 40% off.. (except Lionel train stock) so I went in and inquired about any "Cox" related items. The fella (the owner..) went into the back-room and returned with a small box full of Cox NOS parts! Mostly odd stuff.. but it still put a smile on my "poker-face". I bought some stuff for myself.. and took photos of what was there.. to post here on the forum. I ended up purchasing some items for a few members.. and sending them off in the mail. The owner said that there was another box full of Cox stuff.. but he couldn't find it. I can only imagine what was in that box. The shop closed.. before I could get any personal contact info. to see if he'd later found it. I should have kept on top of that.. but unfortunately I didn't.

Thanks Marleysky for stepping up. Now I need to learn how to give greenies

I received my DAL propeller order (PN 5040-2 blade) last Saturday. The package was in the mailbox when we got home from Sturbridge, MA on Sunday. After examining them.. I wouldn't use a zero-drag starter-spring on them. They are very lightweight.. but seem quite flexible.

They do look to have a “beefy” hub compared to other “electric duty props”. Try and get a side by side comparison picture with a master airscrew or Cox prop just to see the difference?

I ordered a set from DAL.

Marleysky wrote:They do look to have a “beefy” hub compared to other “electric duty props”.  Try and get a side by side comparison picture with a master airscrew or Cox prop just to see the difference?

Roddie,
If you could, that would be great to see a side to side comparison. I'd like to see a low cost option for props, but like many low cost options, they often become a bad option. The blade to hub contact area looks very thin, that and a prop that flexes is not a good thing as far as performance goes.

Here are a Cox yellow safety top prop, Master Airscrew prop and my DAL Prop. Hope this helps some.