My need for speed
12-14-2011, 06:57 AM
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RE: My need for speed
We have installed a Super Tiger G-21 46 in the plane. Engine was installed using one of the aluminum plates from a Viper kit. we have installed electric retracts from Hobby People. We installed the battery in the air intake for balance reason. We are going to maiden this coming weekend.
12-14-2011, 07:02 PM
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RE: My need for speed
your pipe is very long for that engine. that engine isnt very strong to begin with.
I have had two of those planes and a few of the other GP combat size planes. the one that always fails is the elevator.
you must make a stronger one. these are on the stock ones with 25-35 size engines and a jett muffler. your adding retracts, a 46 size engine and a full tuned pipe.
all this adds weight which means more stress on the elevator.
It is a cool project but beaware.....
I have had two of those planes and a few of the other GP combat size planes. the one that always fails is the elevator.
you must make a stronger one. these are on the stock ones with 25-35 size engines and a jett muffler. your adding retracts, a 46 size engine and a full tuned pipe.
all this adds weight which means more stress on the elevator.
It is a cool project but beaware.....
12-14-2011, 07:22 PM
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RE: My need for speed
Hobby People.comWe used the 5 lb retracts. The wing is not thick enough to install the retract block all the way into wing, so we stripped the wing, added some reinforcement to the ribs and installed a plate of 3/16 ply to that area and installed the retracts to the plate. The major problem is the thickness of the wing.
12-15-2011, 10:34 AM
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RE: My need for speed
Should do better than 13K on a 9x7 with just the muffler.
The long pipe will act as a governor it determines the RPM target.
You do not have to start cutting - your best best is to keep going up in prop size until the rpm starts to fall off, or the engine starts misbehaving. Then back off one prop size.
Keep an APC 10x7 handy... i think you might be surprised
The long pipe will act as a governor it determines the RPM target.
You do not have to start cutting - your best best is to keep going up in prop size until the rpm starts to fall off, or the engine starts misbehaving. Then back off one prop size.
Keep an APC 10x7 handy... i think you might be surprised
12-15-2011, 02:38 PM
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RE: My need for speed
We started with a what we will call a number three header, by that we mean it came out away from the fusealodge quite a bit. We order a number one header and cut it to the length of the original header. On the original we were getting around 12,600 to 12,800. With the new header cut we are getting right at 13,000. You have to understand this engine is old and well worn. We are waiting on a radio return that is being changed to channel 50. We will set up and we will try the 10 props. Thanks for your interest.
Bob
Bob
12-15-2011, 03:52 PM
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RE: My need for speed
ORIGINAL: bob27s
Should do better than 13K on a 9x7 with just the muffler.
The long pipe will act as a governor it determines the RPM target.
You do not have to start cutting - your best best is to keep going up in prop size until the rpm starts to fall off, or the engine starts misbehaving. Then back off one prop size.
Keep an APC 10x7 handy... i think you might be surprised
Should do better than 13K on a 9x7 with just the muffler.
The long pipe will act as a governor it determines the RPM target.
You do not have to start cutting - your best best is to keep going up in prop size until the rpm starts to fall off, or the engine starts misbehaving. Then back off one prop size.
Keep an APC 10x7 handy... i think you might be surprised
Bob is right, should get more rpm with the stock muffler, whats the point of having a tuned pipe if its not used to its potential? Just curious
12-15-2011, 04:57 PM
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RE: My need for speed
ORIGINAL: bob62
Here are the pictures
Here are the pictures
