flyierjon

Hi all, im running an 18 x 10 wood prop on a 70" cap 232 built up kit and it doesnt seem to have the power i was hoping, (won't hover, unlimited vertical, ect)... everything is tuned right and im getting the correct rpm they say i should with this prop. my question is... If i drop down to a 17 x 8 wood prop, would that help and is that ok to run on a 30cc gas engine?
Thanks
Jon

Truckracer

My Feedback: (19)

First what brand of engine do you have? 30 sized engines vary considerably in power output. Also, what does your plane weigh?

I have (2) DLE 30 engines that seem at their best with something like a Xoar 19-6 through 19-8. In general for maximum climb performance you'll want to stay with a fairly high diameter prop with reduced pitch. For speed, reduce diameter and increase pitch. I run the 19-6 on a 15 pound CUB and it has almost unlimited vertical climb. The 19-8 is on an 11 pound YAK and it has unlimited vertical. I rarely use a tach on these engines so I have no idea what RPM they are turning.

CK1

My Feedback: (60)

everyone will have their opinions and I have found that I get the best 3d performance out of a xoar 19x8 laminated or a vvrc 20x6 prop on my DLE 30 but a lot depends on the weight of the plane , engine break in and tune . It takes a couple gallons of fuel through a DLE 30 before they start performing at their peak . So get it broke in good before you start working it too hard , also projected RPM s aren't everything, it usually takes some testing to find the just right prop for an airframe engine combo . Dropping down to a 17x8 may help but the engine is very capable of turning a bigger prop.

ahicks

My Feedback: (2)

APC 18x8W or 20x6W.

APC "W" series props really seem to work well for me.

10" of pitch on an acrobatic planes seems like too much pitch to me. That's more like a warbird prop.

daveopam

My Feedback: (9)

I use a Xoar 18x6 on a DLE30cc. The throttle response and pull are just right. the airframe is a 3DHShop Edge. It's very light for a 30cc will hover at 50% throttle with plenty of climb out.

David

MTK

As TR stated, depends on the engine, plane weight and the prop. I used to run the 18.1x10 apc on my Syssa 30cc. It worked well on the muffler and it produced another 1000 rpm on a pipe. No problems with a 12 pound airframe.

Dropping down to the 17x8 will work but you will leave a lot of torque on the table if you are using one of the more popular 30's.

Example, my OS GT33 loves the APC 20.5x10 narrow and the 20x10.5 narrow. But it's an absolute dawg on an 18x8" prop. I mean it runs fine but the larger draggier planes I fly don't do much

captinjohn

A 20x6 beech wood prop pulls good!

Lifer

My Feedback: (1)

Ditto on the 20x6 prop. Also, if you want to boost the power, try a Bowman ring.