ul-1 prop problem

[TheGnMan]

Hello I am having prop trouble for a ul-1 I bought recently. Its a 40 x 57 3 blade prop. I sharpened and balanced the prop as instructed with online instruction since it was my 1st aftermarket prop I have ever bought. The issue is that when I put it on, the boat has no get up and go it cant even get on plane as it just wants to nose dive. I put the stock prop back on , no issues whatsoever. Does anyone know what I did to goof up. Thxs Rob

[LarrysDrifter]

Lower the strut to an inch or an 1 1/8".

[jamie]

Can you give more info such as strut depth / angle and battery type & size or post some photos ... The strut angle would be the first thing i would look at, get it close to 0 angle or slightly swept back look on here for photos and info

[JimClark]

There is loads of info on the UL-1 forum which is where I moved your thread to.

[dana]

the 40/57 needs alot of work. i put in 4 hours on mine to get the blades thinned out. gets right up

[TheGnMan]

thxs guys everything is bone stock strut location is w.e. the boat is setup with from box and i guess I just thought sharpen/balance throw it on but i guess im wrong and i dont know crap about boats just gettin into them. You would think I would since i have been friends with all the guys at aeromarine for 17yrs its like 20mins from my home. Maybe I should bring it out to them goin to here a earful for buying a rtr ...just didnt want to spend a mint on my 1st boat ...think i got the itch already though lol

[TheGnMan]

Hey Jamie thxs for reply could you tell me where to find a picture of what the strut angle should look like as you suggested. I would appreciate it thxs

[TheGnMan]

Ok guys I tilted the strut to 1in if im taking the measurements right I figured from bottom of boat to center of drive correct me if thats wrong please. As for strut height, rudder angle , and turn fin angle any suggestion on where to go from stock locations what works for you guys ill try starting there. Thxs again

[jamie]

Measure bottom of hull to bottom of strut its a lot easier, stock position should be around 7/8" or around .900 thou. If you lower the strut much more than about 100 thou it starts increasing the angle too much so you need to (be careful here ) work the shaft tube so that the angle is not increased.
As suggested go in steps but 1 '' and little or no strut angle should get you on plane.


Other good sources of info :

http://www.rcgroups.com/forums/showthread.php?t=965826

http://www.rcuniverse.com/forum/m_8054040/mpage_1/key_/tm.htm

[jamie]

Stock rudder and turn fin should be sweet just make sure you got decent lipo's 30c 4000mah would be my minimum, thats twice the esc rating.. Your gonna havta gun it to get it goin

[TheGnMan]

Thxs Jamie Im running 2 7.4v 5000mah 50c 100c burst elite packs my other set is polyquest 5050mah 35c 70 burst . As for strut angle what would you say the degree and height is outta box just curious (wanna make sure I have a good starting point on how to make adjustments). Also Im reading some post about sharpening rudder you know any info on that. Thxs

[dana]

Mine gets up on a plane and my strut is at 7/8. Its all about how good your prop is.

[TheGnMan]

I have been doin alot of reading on the thread that has like 3000 views like 10 down from this one. Most of it im understanding but some is greek to me. It would have been nice if the instructions to this boat had a glossary and a diagram, cad drawing or something to help us noobs understand defination of terms and locations, but anyway... It looks like I have alot to do to get this thing faster than outta box. So right now I guess I need someone to help me with close enough settings for the prop im trying to use. I do understand how to set c.o.g. but as for setting this strut with angle and height adjustments ,sharpening rudder how and with what tool , whats the deal with the hole that needs to be plugged up with epoxy when sharpening is complete? Also there is some termanology and quotes from that thread im stumped with like , downward angle is that positive or negative pitch per boat instructions and flatten the strut and this quote from grimracer " set the turn fin so the top of break is parallel to the foot print with your 15/16th strut height" thxs to anyone who can give me some simple advice trying to use 40x57 prop... man I thought helis where tough these boats are just as hard with setup. I guess its just one of those thing when it clicks it all makes sense. Thxs again Rob

[TheGnMan]

One quick note I guess when I finally get all of this then I have to hope I sharpened prop right one things for sure its balanced dead on lol.

[dana]

You've picked in my opinion, the, roughest prop made. Most guys drop the strut to get it to work, but really the prop just needs so much work. It's not just about making the edges sharp, but thinning the blades over the entire blade. The 40/57 blades are as thick as quarters. They need to be ALOT thinner. I've run that prop on my ul1 with the strut all the way up and still get on a plane no problem. I literally spend 4 solid hours with files getting that thing nice with hand files. It's a tough prop if you've never done one before. Negative angle is when the prop is pointing at the floor.