The never ending engine thread, East-West - Page 876 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 04-13-2014, 08:09 PM   #8751
super08
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Re: The never ending engine thread, East-West


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LOL Dale
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Old 04-13-2014, 08:12 PM   #8752
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Re: The never ending engine thread, East-West

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Took the little one swimming today . And on the topic disccused last night can't maiden the edge yet. I'm gonna name that sweet new bipe big bird
Yes, we can understand why you have names the 46%'r Big Bird.

Jeff, should we call Brodie, Big Chicken? Or, does it take more than a 61cc bird to be called, "Big"?

-Dale-
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Old 04-13-2014, 08:15 PM   #8753
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Re: The never ending engine thread, East-West

Lol what ever floats your boat.
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Old 04-13-2014, 08:20 PM   #8754
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Re: The never ending engine thread, East-West

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Lol what ever floats your boat.
O.K.
Jeff he is not in the mood this eve.

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Old 04-13-2014, 08:36 PM   #8755
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Re: The never ending engine thread, East-West

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Jeff, he developed the shakes!
That is better than developing the Sh!Ts and can't fly.
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Old 04-13-2014, 09:12 PM   #8756
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Re: The never ending engine thread, East-West

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O.K.
Jeff he is not in the mood this eve.

-Dale-
Just busy dale lol Gus's is here
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Old 04-14-2014, 12:45 PM   #8757
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Re: The never ending engine thread, East-West

WooHoo. Had a great weekend flying out here. Almost no wind, 18c and sunny. Got a total of 8 flights on the bulldog, it was great. Will get some pics up soon. Dale, big bird looks great, whens the maiden......
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Old 04-14-2014, 02:01 PM   #8758
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Re: The never ending engine thread, East-West

After watching a video of a maiden flight I got to wondering what to do to increase engine efficiency. Lets assume the engine is tuned as good as it could be for the run time. It appeared the after a certain RPM the plane didn't exhibit any better performance with more throttle. (again may appear differently in person than on a video)

It would appear (to us less informed) that the engine/plane was under propped. The word "cavitation" came up from the peanut gallery. So what does one do to reduce this issue? Does switching up to a 3 blade prop help or hinder with cavitation?

To me, cavitation is the phenomenon where part of the whole (ie. second blade on 2 blade prop) isn't actually helping propel the plane.
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Old 04-14-2014, 02:48 PM   #8759
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Re: The never ending engine thread, East-West

I don't think cavitation would be the right word for it. Pitch on the prop is like gears on your car. driving around in first gear will make the engine scream and hardly go anywhere the tires wouldn't be spinning. Where a higher gear will keep the rev's down and carry a higher forward speed at a more tame rpm.

Picking the right prop has a lot to do with how your going to fly the plane.

3D type flying is like off road 4X4ing. Low gearing or finer pitched prop lots of rev's and quick engine response.

IMAC type flying be more like road coarse racing. Taller gear ratio or high pitch prop to carry more forward speed and keep the rpms down for quieter prop.
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Old 04-14-2014, 07:02 PM   #8760
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Re: The never ending engine thread, East-West

Quote:
Originally Posted by Eye Can Fly View Post
After watching a video of a maiden flight I got to wondering what to do to increase engine efficiency. Lets assume the engine is tuned as good as it could be for the run time. It appeared the after a certain RPM the plane didn't exhibit any better performance with more throttle. (again may appear differently in person than on a video)

It would appear (to us less informed) that the engine/plane was under propped. The word "cavitation" came up from the peanut gallery. So what does one do to reduce this issue? Does switching up to a 3 blade prop help or hinder with cavitation?

To me, cavitation is the phenomenon where part of the whole (ie. second blade on 2 blade prop) isn't actually helping propel the plane.
Brent, if not propped properly with a 2 blade, the performance will exhibit your description, under propped. So yes a 3 blade will help or the proper size 2 blade will also help.

Not so sure it's cavitiation or if the wrong prop coupled with the engines porting/timing etc the performance only goes so far. I have heard some say once the prop breaks the sound barrier ( favorite thing to do) it becomes useless rpm....however I don't think that's the case. I believe the prop is still pulling harder!
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