heres a link to some old prop 101 classes. RRhttp://www.rcuniverse.com/showthread.php?s=&threadid=123917&forumid=21&highl ight=props+1011

Chuck, thanks for the offer, but the Rev-up 10x4 is just not quite enough prop for the HP IMO. I still have one used Rev-up 11x4 just in case. I used to use Rev-up 10x5's on the HP with good results.
Paul, the leading edges are not blunt, but they are not sharpened like a razor either. The thinning I do is mostly on the cambered side, which increases the camber. This would make the airfoil shape more pronounced, which should create more lift or thrust. I don't know if the theory is correct, but the results I can see. Tom

Thanks for the tips - 3Dreaming on prop mods. I modified a couple Zinger 10x4s this morning for a Webra 32 mounted on a PBXL. I tried a standard Zinger first, then the modifed version. I believe that I see the difference as well. The day was extremely overcast so I didn't get a chance to tach the difference - but I LIKE IT!!!
I'm going to modify a few 12x4s for my other Fun-Flys and try them.
Thanks 3Dreaming!
Kevin

I modify all my standard Zingers to "pro" zingers (apc style tips) as the HS I order from doesnt carry the pro series. If you get a dubro or robart "high point" (two wheel) style balacer it is quite easy. Also, invest in a small belt sander like the delta, its great for shaping and modifying props. And about $70 US. Comes in really handy for building too.

Now for my question: All this talk about props, especially the now unobtainable rev-ups, has anyone tried any of the control line props from the "olden" days? I fly SAM and have quite a few original Y&O (Yates and Orwick) props. These are lightweight wood props with wide blades, and thin sections. Some of the best control line props going. Brodack has the rights to produce these now I beleive and they are available again. I know many of you dont fly control line but if you ask at a better hobby shop they may have a Brodack catalogue. I should try one out on my fun fly -just never thought of it. I use APC mainly but the lighter weight wood props sure accelerate faster.

AJC

Kevin, thanks for the kind words. Jeff Williams had a 12x4 that I modified that he used on his Sledge MVVS.49 combo till he broke it, then back to a 11x4 stock prop. The 12x4 was just to much for my HP.40, but I think it worked OK on the MVVS.
AJC, if you can post a web site for the props I will check it out. I'll try any brand, type of prop looking for something better. For two engines I think I have over 12 or more different props that I've tried. Someone with some pull needs to bend the ear of a manufacture to get some good wood fun fly props. Tom

Here is the link to Brodak's props. They are the old Y&O props and if you look they are available in low pitch sizes. The props are wide, thin section and shaped tips.

CL stunt flying is sort of like our fun flying - need a good pulling prop with high efficiency and light weight. I think they are worth a try!

link fo rthe 11-4

http://www.brodak.com/catalog/detail...roduct=BH-1544


Andrew

The 12.25 x 3.75 prop and the 10.5 x 4.5 are both control line props from APC..... I think it would be cool to be able to get these in wood...

Tom, I visited Jeff Williams a couple of weeks ago, and he was bragging how well the 12x4 prop that you modified and let him try. Jeff was 'crying' that he broke it too. LOL I strickly run the Webra 50 on my 40-size Fun-Flys. I usually run the APC 12.25x3.75, but like I said before, I am going to modify a few 12x4 Zingers and see if they perform better to my taste. I noticed that elevator manuvers and harriers were allot easier to perform with the modified prop over the MAS I stated off with on the Webra 32. The APC has a tendency to pull the aircraft through the air, even at an idle, which makes the elevator and harrier manuvers very difficult. The APC doesn't have any breaking characteristics. The Zinger seems to do better in these categories, and with the modifications, seem to pull better.
Thanks Again! - Tom
Kevin

I modified a few Zingers 12x4s for my Webra 50. I didn't particularly like the performance. Quicker throttle response with the modified Zinger, though not nearly the same pulling power. For now, I went back to the APC 12.25 x 3.75 for now.

I am running the modified 10x4 Zinger on a Webra 32 on my PBXL. You can go to my website under the movies link and check it out flying with the modified Zinger. You'll notice how the nose jumps up when I hit the throttle. Check them out, they will make you laugh, ecspecially the movie entitled - "OOPS!"
Enjoy - Kevin
By the way, the other movies posted were filmed right after the "OOPS!"

Hi Kevin, sorry to hear that size engine combo didn't work out. I had a 13x5or6 that I tried for my Saito.72, that didn't work very well at all. I ordered some B Y&O props from Brodack. I tried a 11x4 on my HP, and it was way to much. I then tried a 11x3, and it was better but still to much. I think I need to get some 10" props to try. On my Saito.72 I ground run a 14x4 B Y&O, and it shows promise. I need to test fly it to find out for sure. Tom

I too tried a modified 13x5 Zinger on my Webra 50 yesterday. It was too much also. I thought of trying the 12x4 from Brodak as well. I also want to try a Brodak 15x4 on my ST90 on my Ecstasy. Please let me know how they work for you before I order the Brodaks.
Thanks - Kevin

I've been running the unmodified Zinger 11 x 4 props and I love them... I've got one on a Irvine .53 and one on a OS 50... I love them... gives me the throttle response I want.... And plenty to hover with....

You're right, there are great for throttle response and great for hovering, even better for elevators, though I've been spoiled with the pull out authority of the APC from a hover. Modifying the prop according to 3Dreaming's modifications gives it even better throttle response, and better pull, though not like the APC. I guess I just want my cake and eat it too <GRIN>
Oh well!
Kevin

No one around here use the APC 11.5X4 ? A number of people Ive talked to like them better than the 12.25X 3.75. I have one ion the box.....just need to put it on sumthin.

I run the 11.5x4 APC on a MVVS 40 with MVVS mini tune pipe set-up. It runs great in my area. I also this prop on my Webra 50 when I fly at higher altitudes. Normally the 11.5x4 APC is not enough prop for my Webra 50 with a Mac header and tuned pipe, though its a good prop.
If you are running a strong 40 or a 46, then the 11.5x4 APC is a great prop.
Kevin

I used the Brodak Y&O 12X4 & 10X4 on my Webra 50 & Webra 32 respectively yesterday. I ordered two of each and two 15X4s for my ST90 on my Ecstasy. They said that the 15X4s were not available despite you can order them off of their website. I ran the 12X4 on my Webra 50 with Mac Header & tuned pipe mounted on the Wacky-Bee III. The Y&O doesn't quite pull quite as well as the 12.25X3.75 APC, but makes up for that in throttle response. RPM is comparable if not slightly higher over the APC. I got the same throttle response as the Zinger 12X4 (modified and un-modiifed). So I'd have to say, the Y&O has my vote! <GRIN> By the way, the Y&O has an awesome sound to them, it sounds like a Bolly at high RPM . Guys with noise restrictions may have a problem with the Y&O.
I tried the 10X4 Y&O yesterday as well on a Webra 32 mounted to my PBXL. I can't say that I really got to test it though. It was windy out, and I put it into an inverted flat spin from a hover about 1 foot off of the ground. By the way, the inverted flat spin was not on purpose The wind blew it over. I didn't recover too well this time and sacraficed the prop. The other 10X4 they sent to me would not balance (luck of the draw).
As an overall, I'd highly recommend the Y&O for Fun-Flys.
Kevin

I thought they'd be good for the fun fly's - you proved it.

Andrew Coholic

I still have not had time to do anymore testing with the B Y&O props. I want to try a 10x4 on my HP.40, as the 11" props were to much load. I think the 14x4 will work well on the Saito.72, but I still need to flight test it.
Kevin, every B Y&O prop I pulled from the package took a lot of work to get it balanced. I don't know if the hole is off center a little, or it is just that far out of balance. Tom

Tom, It was funny, out of the 4 props that I initially got, two were balanced without any work, one needed some, but very little, and the fourth is garbage. Wood is so inconsistent that you never know what you'll get with wood props. It's just luck of the draw on what you'll get and what it takes to balance it when it comes to wood.
When Brodak sent these props, they also included their full catalog. I think the catalog cost more than the props (By the way - thee catalog was free). The catalog was big! I noticed in their catalog that they offer Rev-Up props as well. The Rev-Ups were less expensive than the Y & Os (slightly). I thought about contacting them to see if they have the Rev-Ups in stock. The Y&O props are very simuliar to the Rev-Ups (possibly even the same though I do not have a Rev-Up right now to compare them). Tom, since you've mentioned that you ran the Rev-Ups, I will be curious to see how you compare the Y&O with the Rev-Up.
Kevin

Kevin, I bought $40+ dollars worth of props, and I didn't get a catalog. I will double check the box to see that I didn't miss it. The HP.40 will turn a 11x4 Rev-up with out any problems, however the B Y&O 11x4 is way way too much. I'll have to check out their site for the Rev-up's though. Tom

Hey guys,What would you guys suggest as a starting prop 4 my TT.46pro with a Macs muffler.It's on a C.G. extreme 330.I've read this thread but I'm not very knowledgeable about the differences. Thanks Shark

Sharkey - If you are running a one-piece Mac muffler, I'd suggest the 11.5x4 APC. If you are running the Mac tuned pipe with the seperate header tuned properly, you can try the 12.25x3.75 APC. In the wood variety, I'd suggest the 12X4 in the B Y&O from Brodak at http://www.brodak.com, or a 12X4 in a Rev-UP (if you can find it). The 12X4 Zinger is all right, though does not offer the pulling power of the others that I have mentioned above even with the modifications, though does increase its performance.

3Dreaming - I did check Brodak's website, and they do not have any Rev-Ups listed. I presume Tom that they sent me a catalog because I was asking about becoming a dealer for their props. Sorry that you did not receive a catalog as well. I am going to contact them about the Rev-Ups. I will let you know how I make out.
Kevin

Thanks Kevin,I have the 1pc macs muffler at the moment.Thought I might make me a mouse can soon.Would the mouse can be huge difference in this motor over the 1pc macs muffler?I'm thinking on trying one of your designs 4 my next project.I've yet too build a kit. Thanks again

Sharkey - realize that the Mac 1 pc. muffler is just an alternative to the stock muffler. Typically, the Mac 1 pc. muffler will not increase the performance significantly, it is just an alternative over stock. Allot of people use the Mac 1 pc. muffler because they were sick and tired of the stock muffler falling apart, typically in the air, and losing the end piece of the muffler. The Mac header and Moose Can will show a significant power and perfromance increase. The increase will vary based on numerous variables. The Tuning of the header is the most important. You will realize at least 1000 RPM increase and sometimes over double that. I like to run my headers about 1/4" to 1/2" longer, as opposed to trying to achieve max. RPM. This extra length puts a little extra back pressure on the head, which pushes the power band of the engine down towards the mid range RPM where we normally fly our Fun-Flys at.

In regards to first time builder - I am realizing that a significant number of my customer base are first time builders. You'll find that my instructions are very detailed with an abundant of pictures (I am a avid believer that pictures are worth a 1000+ words'). Ask others on this forum about HSRCM, Inc. consturction manuals. I receive numerous compliments regarding how thorough my construction manuals actually are. You'll find alternative set-ups and builder's tips in my manuals as well. Once you move away from the ARFs, you'll never want to go back. You'll find that a kit will fly so much better over the ARFs that you won't believe it. You'll also have a new appreciatation of the aircraft that you personally built. You'll fly with a newly found level of pride.
Hope that this information helps you out, and glad to be of assistance.
Kevin

sharkey,

I have the same setup except for a Tower Hobbies muffler. I quick get it going prop would be 11x4 apc. Kevin's 11.5x4 would be good to.

In the past I would run the 12.25 x 3.75 and Paul S. said to try the smaller diameter as the TT like higher rpms, (I hope I got this right, sorry it's from memory). It did work, quicker throttle response also. I just got some 11x4 Zingers and need to try them. The weight difference is huge so it should be interested.

Remember we are talking about small differences here so don't get to worked up about this, (just don't put an 10x7 on that plane).

Have fun.

Ken