SpaceW

Hello!

I use an OS160FX on my Katana S( 1.80m). My propeller is an 18*10 APC. The engine works very well but i fell that i have not all the power. So i would like to know what type of propeller do you use on the same engine to have the best power for an 3D flight.
I 've seen that apc builds 16*8funfly prop? Have you hear about that?
ps: i am french so i apologize for all my mistakes!

Tcho!

hankpajari

My Feedback: (1)

Hi

You might get better results by moving this post to the Glow Engines or even the Pattern Plane sections. This section is for discussing gas (petrol) engines

I don't have an OS 160 only a Saito 150 so I cannot answer your question directly.

BKH

My Feedback: (4)

18x6 wide APC works well

mugenkidd

My Feedback: (94)

I second that go with the APC 18x6 Wide. Or 17x8

SpaceW

Thank you for your answers. I will try the 18*6 apc.
I am sorry for not having put my message at the right place.

seanychen

My Feedback: (4)

If you got $46, do consider the Bolly Carbon 19x6. It will swing 700 rpm faster than the smaller APC 18x6W, and will generate 2 more lb. of thrust. It is also lighter, at 4 oz, which makes the transition crisper.

SpaceW

Ok thank you sheanychen ; but where i can find this prop. I live in france and i have never heard about The Bolly Carbon! I only know Mejlik!

doubledee

My Feedback: (4)

SpaceW,

You are not in the wrong place. This is the glow engines forum and the OS160 is a glow engine.

Try www. bolly.com.au for information on Bolly propellers.

Don't apologize for your English, after all, it is better than mowst of our French.

Regards,
doubledee

SpaceW

Thank you Doubelbee!
I first put my message in the forum " gas engine" and it was a mistake. I knew what "gas" means and what my OS160 was but i did not know why i put my post in this forum. Sometimes my brain doesn't work as fast as i wish!
I will visit the site but if you know the carbon prop : "Mejzlik" could you advice me the best prop of this compagny for my OS160?

Thanks!

Bye

JoeAirPort

My Feedback: (41)

http://www.desertaircraft.com/page.php?Page=Mejzlik

Mejzlik also has a 19x6 CF prop but it will turn very low RPM's (7000's). Try a Mejlik 18x8 and it will turn about 8400 RPM's. Also the Pro Zinger 18x8 would turn 8500 RPM and is much less expensive. I've used the Pro Zinger 18x10 on my Moki 1.80 and they are decent props. You want to keep this engine RPM under 9000 RPM. 8500 RPM is ideal. Also a wood prop transitons much faster than CF or fiber filled APC's.

This thread is all about different props and what RPM they turn on the OS 1.60. Post #53, 57, 65, and 102 talk about the Mejlik.


http://www.rcuniverse.com/forum/m_26...mejzlik/tm.htm

seanychen

My Feedback: (4)

Bolly has a 19x6 solid carbon fiber prop and it will turn very high rpm, probably around 9500 on the OS 160 FX. It weighs 4 oz, compared to Pro Zinger 18" prop that weighs 3 oz. Its transition is pretty good.

Mejzlik has a 20x6 and OS 160 should turn that in the mid 8k according to what some owners say.

JoeAirPort

My Feedback: (41)

I think 9500 RPM is too high on that engine don't you think? Anyone have a torque curve for an OS 1.60?

SpaceW

hello!
i read a lot of things about os160fx and prop( How this forum is interesting!!!). The result of my research is not very clear-cut : there are almost too much information! However i have choosen 3 props :
Apc: 18*6 wide
Mejzlik : 18*8
Menz 18*8 or 18*6
Unfortunately i are not able to make a choise between these props: it seems that the apc provides good verticale performance but it weights too much. The Mejzlik seems to be better? And what about the Menz?
I am conscious that i wonder too many questions but these prop are expensive so i want to buy the best prop for 3d flying!
thank you!.

For information : a Mejzlik and an apc cost almost the same in france; but the menz is veri cheaper!

PlaneKrazee

My Feedback: (14)

Best 3-d would be the Mejzlik 20X6, I have run one. The Bolly sounds interesting.

DarZeelon

Joe,


This prop at this RPM is 4.34 HP...
There is no way this engine, even with a tuned pipe and 25% nitro can make this.

Os themselves don't claim more than 3.7 @ 9,000 and we already know, that most of these manufacturers claims are utter lies...

This engine would be lucky to actually exceed 3 HP, in most installations.

PlaneKrazee

My Feedback: (14)

the 160Fx will spin a Mejzlik 18X6 at 9600 rpm easily and will spin closer to 10,000 on 15% nitro, the prop has very little load. BTW, the OS 160FX appears to have more power than the MVVS 160, you should buy one and compare.

PlaneKrazee

My Feedback: (14)

Dar,

Perhaps the Bolly 19X8 presents less load than a APC 18X6.

DarZeelon

The Bolly has a load factor of 1.2, like the Menz.

The Mejzlik and the APC are 1.1, 9% lighter.

Spinning a Mejzlik at high RPM is easier than doing the same with a Bolly.
The MVVS 1.60 spins a Bolly 18x6 at 9,000 RPM on 0% nitro (my last check).
I wouldn't expect it to exceed this number, since the power curve is on the down-slope beyond 9K. But MVVS is not the focus of this thread, so I'll stick with the OS numbers.

A 19x6 is significantly heavier than nearly any 18x6.

PlaneKrazee

My Feedback: (14)

The Mejzlik has much less load compared to a APC. The APC 18X6 and Mejzlik 18X8 are the same load. Bolly props are made to spin at higher revs, I own two. The Bolly 18X10 spins at the same rpm as a APC 18X8. The 16.5X10 three blade has the same load as the 18X10. How do you know what each manufacturers props load factors are? Are you saying an APC 18X8 and 18X8W have the same load? I am afraid you are disseminating false information.

seanychen

My Feedback: (4)

Dar, just presenting the facts that I personally have measured:

Bolly 19x6 weighs 4 oz, APC 18x6W weighs 5 oz

ST G2300 swings Bolly 19x6 @ 9200 rpm, but swings APC 18x6W 8500 rpm on same fuel & same plane

YS 140 DZ swings Bolly 19x6 @ 10200 rpm, but swings APC 18x8W @ 8500 rpm on same fuel and same plane

The load factor does not apply equally to every prop size within a brand.

******************************

Above are facts. Here my opinion. I think Bolly 19x6 carbon prop has less load than APC 18x6W is because it's airfoil is thinner, thus causing less drag-load. Granted, lift-thrust won't be as high as if its blade were thicker & wider, but it makes up the power with higher rpm.

I believe that Bolly's carbon prop design has an advantage at this size because for APC props to hold shape for this size, it needs beefier cross section, which may not be good for efficiency. Bolly's carbon prop, benefiting from the superior strength of carbon fiber skin and thin fiber core, will be able to sustain airfoil shape with a thinner cross section. How do I know? I broke the prop at a bad landing and got to see it internal structure. Well, it's an expensive lesson, $46 a piece.

DarZeelon

Brian, Seanychen,


I do not wish to argue about the results that you actually measured.
I trust that the measurements were taken properly.


I was referring to the wooden Bolly props, which are similar in design and appearance to Menz.
They have quite a thick airfoil and produce very nice thrust numbers.

The carbon fiber Bolly props do indeed have a thinner airfoil and you should expect higher RPM from them.

I sell Bolly here.
The 22x8 size C/F, which in wood offers a reasonable load for a 50 cc gas engine, allowed the RPM to be too high on the same engine.


...Sean, I practice my bad landings on wood props... It's still expensive...<GGG>

SpaceW

ok guys! I didn't think that this thread could get into such an argument! What you said is very interesting but it doesnt help me very much..[]
Skypilot one gives an information : the mejzlik 20*6 ( thanks!!!) but i would like that you give more information about this prop and more compares!

Bye!

PlaneKrazee

My Feedback: (14)

The Mejzlik 20X6 prop spins in the 7800-8200 rpm range depending on fuel, temp, muffler and my memory. I have not tached this prop/engine for two years. The next time I remove the cowl I'll change the props and runs tests on all the props I have run on this engine and post it again. If you do a search you may find one of my complete posts listing this information.

The Mejzlik 20X6 does not provide much foward airspeed and would not be recommended for a plane over 14 pounds with less than 960 sq. in wing area. I do not get as good feul economy this this prop because the engine is running at higher rpm. However the plane is easly to fly at a near stalled condition because the prop produces so much thrust.

I would be interested in trying a Bolly carbon 20X6 if I needed more thrust or had money to blow. If the rpm on the 20X6 Bolly was higher it would produce more forward airspeed and possibly more thrust. The problem at my field would be noise. I level flight the Mejzlik rips at full throttle, especially with 15% nitro. I normally run 5% nitro in this engine and get great flight times.

Who sells Bolly carbon props now? The last time I bought mine they came from Falcon in Canada

DarZeelon

Brian,


Bolly model products is handled in the USA by [link=http://www.desertaircraft.com/page.php?Page=Bolly]Desert Aircraft[/link], [link=http://www.aeroproduct.net]Aero Products[/link] and
U.A.V Inc. Phone: 514 382 5409 Fax: 514 385 0117
E-mail: [email protected] - They don't seem to have a web site.

Canada is still listed at Falcon Hobbies.

Their prices seem higher than mine.

seanychen

My Feedback: (4)

Just for kicks, I tried a Zinger 20x6 W/ Moki on my 13 lb. Kangke Cap w/ 950 sq in wing area. It spun 7700 rpm. You are right about the forward speed on a high wind loading plane. You need the speed to get out of the stall transient phase quick. Good thing the Kangke Cap is pretty stable, despite the high wing loading. I am not sure I could say the same if it weighs 14 lb. though.

I just got a wood PK 19x8 from an auction site. I will try it on my Moki 180 once I receive it.

Since this thread is about OS 160, I will state something useful for this engine. I think it's best to keep the peak rpm at about 8500 to get the most benefit out of this engine. So if Mejzlik 20x6 peaks at 8200, it should be fine too. I think this combo would be great on a OMP 80" profile. On a heavier / smaller-wing IMAC plane, 18x8W APC or a thin 19x8 like Bolly Carbon would be great.

*****************************

Sorry about it. I don't mean to be involved in an argument. I was hoping to present the facts without being argumentative. But it's hard to do apparently.