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da 50 props
I just bought a da 50 and want to know if I can use a APC 22x10 prop as I like these props. Can I drill holes in the this prop or is it better to go with the props they (desert aircraft) recomend?
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RE: da 50 props
Go with the manufacturers suggestions. They have their reasons and they are good ones.
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RE: da 50 props
the hub on an APC prop is too small to drill all the mounting bolt holes. I like the menz-s 22-8 on mine
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RE: da 50 props
Unless you are trying to break a speed record, a 23-8 would be a better choice.
Much better at low speeds and especially so if you intend to do any high alpha. 3dbob |
RE: da 50 props
Noww noww,, Guys,,,, :)
Besides suggesting he follow the manufacturers recomendations,, also tell him why he should.... ;) Things as why drilling a composite prop, then subjecting it to vibration and 6000+ rpm, has a way of subjecting the hub to structrual fatigue which then can become,, 'interesting' ,, when props hub area fails... Or how a part of a composite prop,, traveling at over 500 mph can be a little hard to find when prop disintegrates ..... [8D] Annnddd,, that perhaps,, as good as an APC is on a smaller engine,, using one on a DA50 might not prove to be very efficient..... :) :) :) |
RE: da 50 props
So a menz 23x8 prop is the way to go on a 14 pound airplane to do 3D
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RE: da 50 props
The 23-8 would be a far, far better choice. For all the reasons the Moderator, Robby, provided in his post.
I had no desire to get into a long discussion about how APC, or any plastic prop, in that size range became potentially very dangerous to use at high rpm levels. That was without factoring in attempting to drill the prop hub. That's why I didn't go there at the time. Pat |
RE: da 50 props
ORIGINAL: Robby Noww noww,, Guys,,,, :) Besides suggesting he follow the manufacturers recomendations,, also tell him why he should.... ;) Things as why drilling a composite prop, then subjecting it to vibration and 6000+ rpm, has a way of subjecting the hub to structrual fatigue which then can become,, 'interesting' ,, when props hub area fails... Or how a part of a composite prop,, traveling at over 500 mph can be a little hard to find when prop disintegrates ..... [8D] Annnddd,, that perhaps,, as good as an APC is on a smaller engine,, using one on a DA50 might not prove to be very efficient..... :) :) :) Mezjlik are composit props, and I have never heard of any of these issues with these. |
RE: da 50 props
Mejzlik, 3W, Beila, etc.. they are all woven carbon fiber with solid hubs suitable for drilling. APC are cast plastic.. drill the hubs and you are literally assuring yourself of a prop explosion... APC even says this on their packaging... (do not drill hubs)...
DP |
RE: da 50 props
As desertpig says..
Plus,, Mejzlik, 3W, Beila, etc all have larger hub areas so they can be drilled.. |
RE: da 50 props
APC has good reason to warn against drilling the hub.
Despite the fact that they reduce weight of the blades as much as possible by thinning and decreasing area, they never will be able to match the low weight and thrust area of the hollow carbon fibre blades of for example Mejzlik props. From a technical viewpoint, massive glass fibre reinforced plastic has no merits in props over 16" in diameter. This is the realm of wood and (hollow) carbon fibre reinforced plastics. Advantage of the latter materials also is the lower weight, which reduces spin-up and spin-down times, so the engine follows the throttle better. |
RE: da 50 props
Water falls ,blenders and inverted flat spins are much better with a 24x8 prop. Down lines are real slow also.
Kent |
RE: da 50 props
Robby,
Do you know of anyone who makes a 17x6 CF prop. Karol |
RE: da 50 props
ORIGINAL: gonn for good Water falls ,blenders and inverted flat spins are much better with a 24x8 prop. Down lines are real slow also. Kent |
RE: da 50 props
DUH :D
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RE: da 50 props
Karol,,
If you look at: http://mejzlikmodellbau.inshop.cz/inshop/ they have a listing of available props.. And no,, no 17x6 listed... There is 18x6 listed... Bolly has a 16.5 x 8 listed... They do have a 16x6 listed... What do you want this size prop for...? |
RE: da 50 props
It's for my G23 which performs best using an APC 17x6, but which unfortunately is quite heavy and causes some amount of lag when attempting to accelerate quickly to full rpm.
Karol |
RE: da 50 props
So try a wood 16x8...
Will spool up fast.. and pull good.. Plus should RPM well... |
RE: da 50 props
ORIGINAL: Robby So try a wood 16x8... Will spool up fast.. and pull good.. Plus should RPM well... |
RE: da 50 props
You can always cut an 18" prop down to 17". Just be sure to reseal the wood and balance.
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RE: da 50 props
ORIGINAL: mstroh3961 You can always cut an 18" prop down to 17". Just be sure to reseal the wood and balance. I have done that too, but I am trying to locate a source for a 17x6 Carbon Fiber prop. Karol |
RE: da 50 props
I was looking on the bolly websight and found this quote.
[i]If you have a special need, we can customize a prop for you. Any Bolly prop can be repitched +/- 2", as well as shortened or lengthened as desired. We have the equipment to do repitching and shortening in house, however, longer props must be custom ordered. We generally stock balanced props, but if you'd like to balance them yourself, we can get unbalanced props for you as well. [/i] http://www.bollyprops.com/Merchant2/...tore_Code=BPNA |
RE: da 50 props
Thanks, thats just the info I needed.
Karol |
RE: da 50 props
:D:D:DGlad to help!
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RE: da 50 props
OK Guys, I have been trying to get a Menz 22-8 or 23-8 since early summer. DA says that Menz has not shipped props all summer, though they recently got some of the larger sizes. I have also been looking for a Biela 22-8.
Anyone know where you can actually buy these; i.e. in stock? |
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