I too have faithfully used the 15/6 on past UCDs. Obtaining RPMs in the specified range, but found in a hover it was at the top end of the throttle range. It would pull out but needed more. In my goal to hover off the deck, I felt there wasn't enough there. When I changed I went too far with the 16/4. It was locally available, but apparently too much for this engine choice. Maybe 30% heli is required. With the 4 pitch it now hovers at half throttle, leaving a wider margin for escape in poor attitudes. Also it now torques in hover with the 16" diameter prop which was an effort with the 15/6. With the 4 pitch it now jumps off the deck on take off. It seems the 15/4 should have been the next step from a 15/6. I will get it on today and see if the weather co-operates and will report back on RPMs and performance. Joe

Dave, here it is. I was way off in my assumption, you know what happens when one assumes. It is a fixed pitch designation, considered a changing pitch prop. It starts as a 10 pitch toward the center and tapers to a 6 pitch as it goes out toward the tip. The reason behind it is that it will flex less under load. Meaning that, static, an engine with a constant pitch prop, at full throttle, the tips of the prop will pull forward arcing the blades. On the other hand, mathematically a 15/6-10 prop averages out to a 15/8 which is considered too much pitch for this model. This info is from a 30 year vet, but I cannot say that it covers all the variables in prop selection and performance. Joe

Missed one. Low pitched props supply less speed and more thrust with a quicker spool up and higher RPMs. It will also slow the plane down faster resulting in greater speed control. With this prop it is now like a tractor, slower but more powerfull, or as Coomarlin put it, its like a stump puller, which is what you want for this type of flying.

While everyone is on the subject of props. What would everyone recommend for an OS .91 2 stroke? I wish that I would have gotten a 4 stroke but the deal that I got was too good to pass up. I need to make this work for the time being as my airplane budget has been overextended.

OS .91 FX ringed. OS recommends a 13/8 or 13/9. This is a sport plane application. I do not know the recommended RPM range for this engine. This engine has been tached with the following results:
13/6 @ 12,500
13/8 @ 10,400
13/10 @ 9,500

14/6 @ 10,900
14/8 @ 9,500
14/10 @ 8,400

15/6 @ 10,200
15/8 @ 8,100
16/6 @ 8,300

From what I've read a 14/4 works well with this setup. With a 13/6 @ 12,500 and a 14/6 @ 10,900 a 14/4 should put you in the high 11,000s. Go APC over wood. Joe

If you are using 30% nitro use the APC 16 x 4W and if you use 20% or less then use the 15 x 4W. For folks running the YS 91 then the 16 x 4W works good.

Ed M.

Excelent work Watson... Now pass that syringe will you old chap

We were assuming pretty much the same actually.. never assume anything...it makes an......ASS outof U and ME..,thanks Joe...
Oh..! ment to ask this one a while ago too..any hot hints for pull/pull setups...the only thing i have been told is keep the distance from the centre of the servo, to the centre of the holes in the servo arm, the same as from the hinge line on say, your rudder, to the holes where the clevis pins go in the horns .... shall i type that again ...sounds complicated.. ...how taught are the cables supposed to be...?.. catch ya later...Dave

P.S..
Just took the kids up to get a DVD... Parked behind a new A8 4.2 Quattro [:-]....what would one of those cost over with you...

Dave, Yes the connection you speak of is considered 1 to 1. It is equall. Now if you are useing the HD setup with the rod that goes through the rudder with the conical standoffs and lock nuts then you must bend the rod equally on both sides towards the servo or front of plane about 10 degrees on either side. If left straight when useing cables you will find that while the pulling cable stays taught as it pulls to turn the rudder, the opposeing cable develops some slop. When the rod is bent for some reason both cables remain taught. If useing control horns then I do not know how it would be compensated. As with any connection you want it to be slop free. The cables should be tight enough to be slop free yet not to a point where it is putting excess strain on the rudder hinges, rudder or servo. When connected, at half span, by applying pressure with your finger, like on a guitar string, it should flex about a half inch in both directions. Also the cable cross over each other in the shape of an X in this setup. Here is a pic of how the rod should be bent.

On your other question I don't think the A8 costs as much as the new VW flagship, the Phaeton has recently rolled into the states at $88,000.00 Joe

Ed, I have thought of this alternative. Will the 30% be enough to compensate for the sluggish performance with the Saito 100 and a 16/4? Also will the low end have to be reset to compensate for the higher nitro content and the additional oil? Thanks, Joe

Oil content will remain the same. Sometimes when going to a higher nitro fuel you do have to open up the needles SLIGHTLY, more power, more fuel. If its anything like mine it will not be sluggish at all with the 16 x 4W and 30%. Now when I tried it with 15% that would be a good description.

That said, the 15 x 4W and 20% makes for a good combo on the UCD 60.

Ed M.

Ed, thanks for the reply. Well the weather gods smiled on us today. Headed out late this afternoon for a good 4 hrs. of flying and general BS. Watched two guys put six planes in, one right after another. Comical. Then it happened, the wind went flat, dead calm. All you could here is me gigling putting the wing on my UCD. I'm likeing the 15/4 prop. Slows down more than the 15/6, but its comfortable. It will torque the plane in a hover and still has authority on pullout. Didn't have the tach with me (again) so i don't have any data to pass along, but it had a noticible increase in RPMs over the 16/4 and spool up was much quicker. Still impressed with the Cline regulator, talk about smooth performance and low idle. Once I get a tach on it I'm going to run the high end needle out just to see what happens. I've read that some engines are at about 2 3/4 turns out. I'm still at 1 1/2 turns. This plane is a sweathart, its so light, I don't think it leaves tracks in the grass when it lands. Talk about floating in. Still can't figure out the too doo about knocking the gear off. I guess thats just what it is, their knocking them off. With a little luck, tomorrow will be flying weather as well. Joe

Joe,
There ya go.. no need for all the worry in previous posts ..Roger will have you about this.. ...six planes in...oh no..!...depression[]

On the subject of which, were in the middle of one, bright warm sunshine one moment, by the time i've got to the car, huge vicious black clouds and hailstones bouncing all around... this is not what we ordered for the w/end... toss me any Prozac you may have left over TTFN

-LL...CT......crashed the 3D today.....I'll get pics soon....its not bad...just some wing rash..and some other miner damage.....a total of 5 planes and 1 heli went in today .....I'll tell you all about it later...JW

Gentlemen, upon leaving the right thrust at 3 degrees until I tried the 15/4 it turns out that it is not quite enough. Now the Q is do I add more right thrust or mix it out with rudder to throttle? Joe

Joe,
Hurry up and find out what's needed before I mount my engine!! Do you think another degree is the ticket or more?? If you think four is going to be enough, then I'll just throw two plates in. On second thought think maybe I'll wait to mount the engine until the trust issue has been resolved.

Just got back from flying Simply Magic. Still balloons on landing, the extra nose weight had no effect so it was removed. Other than that flies great and has no bad tendencies. The airplane also lands great with some flaps. Going to pull the engine tomorrow and add some down thrust and try her again on Monday.

David, How is the Cyclone coming along?? Did you order the WildHare yet??

JW, We are still all waiting to hear about what happened to your plane. The suspense is killing me.

Matt, Promised article left via USPS yesterday.

Have fun flying this weekend Ya'All. Brian....

Well to start off ...me and a new found friend were at the field doing some formation flying then we started getting a little crazy we were doing the ( how close can we get to each other head on) and... Bam...mid-air....I was flying my GP big stick 60 and he was flying his seagull zero....on impact my stick cut one wing and the tail off his zero....the zero went down in flames ...the stick suffered damage to the left wing and landing gear but was able to keep flying ...I got it back to the runway and landed it with no problem....in the frontal pic of the big stick I had straightened the gear ..it was bent up 30+ degrees from the pic ...Then 2 guys crashed do to radio problems the heli,do to gyro failure...Now the 3d...I was flying inverted at about 6' over the runway then when I banked left a friend (coming from the other direction at a higher altitude ) pasted over me I tried to roll right and my wing tip clipped the ground causing the plane to cartwheel nose to tail ...I was very happy that the damage minimal ..the damage consists of wing , landing gear ,cowl, spinner & prop canopy,horizontal stab....I haven't had the time to look it over so it my have more hidden damage.....pics of the GP big stick and the 3d.....JW

few more....JW

Oya ...LL/THE WOLF you need to find a pic of a wolf nawing on a moose leg for you'r avstar......That one looks to friendly.....LOL...JW

J Dubya, aside from obvious problems, your engine ran cool enough with that little air inlet cut in the cowl? Now is the time to cut off the wing tips. Guys are reporting good results with them off regarding knife edge and harriers. Thats not too too bad, its work though. Now here is a wreck.

Dave, thats a wolf? Joe

Stoney..

Sounds like your weather is much better than here...bad wekend looming.. arghhhh ...she'l have another huge list for me..[:-] ...UCD finished ..Cyclone 90% done... stalled.. waiting for a header pipe ( inside ) for the 1.20FS...to mate up with the 502 pipe system..bound to be some pipework mods to do...Tower have for some reason "Discontiniued" this item...Buggers.. i feel a visit to the coppersmiths at work coming on ...had to wiz out and buy a little "something for the weekend.."...nothing major...a Ripmax low wing trainer.. " Skymax 40 " Peter had been yapping on about..i'll send some photo's...quite a nice little kit really...for £60 quid odd...same price as a tank of Gas[:-] ..catch ya later..

Jw..Joe..

I'm in shock ..[&o]..." X " rated stuff this.. i'd forgotten how real bad things can get...had years of it though...i think this lot of ours can stop indoors... spoilt the night that has...i'll wake up in a cold sweat,with mangled UCD's sitting on the end of the bed ...arrgghhh..

Dont be rude...it's a lady wolf... a wolfess or whatever ....i'll find another

It was a JOKE......[sm=lol.gif] Please take it as such......no bad feelings intended[sm=lol.gif]

LL what is the part# of the header you are looking for ? I'll see if I can find you one here.....JW

Ya the motor runs fine with the small hole in the cowl ...the prop hides the two other holes by the spinner....and I stand down ...I didn't have a wreck I had a ding.....LOL....it look nasty when it hit....I wish you could have seen it...........JW quote]ORIGINAL: cumn thru

J Dubya, aside from obvious problems, your engine ran cool enough with that little air inlet cut in the cowl? Now is the time to cut off the wing tips. Guys are reporting good results with them off regarding knife edge and harriers. Thats not too too bad, its work though. Now here is a wreck.

Dave, thats a wolf? Joe
[/quote]

Jw..
Of course i knew it was a joke...you should know me better by now....before dawn 'll find a real mean wolfie avtar...

The part # for the header ...72140400 ..thats an O.S Mnfr's no .. it fits into the bit above the ''caps'' lock key.. catch ya later

I've been keeping up to date with you guys reading the updates. Joe, congrats on Frankenstein rebirth and great flying success. Hard to believe you could get such persicion form such a heap. My hat is off to you for even trying. I assure you the can would have been my next stop and then the hobby store for a new plane. Great work.

JW- ouch, but Joe's success story should be an inspiration.

I actually finished my slide show project for the tennis team banquet and got in some flying this afternoon. Perfect weather, though we had a good cross wind out of the west with the main runway running N and S. I had to tweak the needles on the 91 surpass . 1/8 to richen on the low and and fine tuned the high for a perfect afternoon of flying. I have been lucky so far with no mishaps. Several others in our club are finishing up on there UCD's. This plane has really caught on at our club. I will get some pictures once we get them on on the flight line.

Had the Giles out as well. I pretty much had the sky to myself with only a handful of other pilots. Had a great time with the UCD and the Giles flying perfectly. Got everything home with no mishaps.

Joe would call my crash .....Hanger rash.....LOL....actually my wreck was a good thing ...this morning after looking it over carefully I removed the cowl and to my suprise two of the motor mount screws on the right were gone but the blind nuts were still in place.... I was wondering why it would track to the left in a hover...and now I know....and with that being said ...............................................

I would like to REMIND everyone about the Dangers of RC planes and the power of your motor .....PLEASE NEVER EVER tack your engine from the front or allow anyone to get in front or on the side of the prop with it running. I know we all become complacent and kid ourselves (thinking It wont happen to me)....believe me I'm as guilty as the next guy I was tacking my YS110 from the front the day before.... knowing the Dangers involved.......Tonight at the field a friend was starting his Funtana while it was on the ground unrestrained.... I think he has a Saito 72 or 100 with a plastic spinner on the front ....Well guess what happened.....the spinner shattered ....stunned he reached for his radio and the prop struck his left knee cutting through his pants ripping three very deep cuts in the side of his knee on the inside ...the cuts were about 2-3" in length and 1/2" deep...his nice white Funtana had chunks of flesh and blood spattered all over it......I'm being graphic hoping to make everyone take note ..... be careful and Please respect the power of your motor it's not a toy ....and DON'T use plastic spinners on the high powered motors it is a disaster waiting to happen......If by writing this I can stop just one person from getting hurt then I think my friend would be happy...SAFETY FIRST...oya one last thing ...a first aid kit would have been a handy thing to have at the field tonight....I'll have one from now on...... JW