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Old 03-07-2021, 09:37 AM
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I used to hammer at 1500 feet
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the wings are done.
Next is CG check.
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Old 03-07-2021, 12:01 PM
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I used to hammer at 1500 feet
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United States, LA, Shreveport
Joined Apr 2012
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very exciting

My first Biplane
&
My first Pattern airplane!



Should be fun.

Flight update soon.

(after CG check)
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Old 03-07-2021, 12:11 PM
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Have Fun And Fly
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Looks great. With all that you did to get this air-ready, it’s hardly accurate to refer to these as “ARF’s”, as they are nowhere near almost ready to fly.
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Old 03-07-2021, 04:11 PM
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I used to hammer at 1500 feet
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United States, LA, Shreveport
Joined Apr 2012
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CG point (do not know yet).

I do not know where the CG point is yet.

With the batteries forward, this is the balance point I get.


based off the top wing, the airplane balances at about 7.5" aft of the forward most point of the top wing.

Once I know what it is, I can edit this post.

Waiting to hear from Marcelo.
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Old 03-07-2021, 04:18 PM
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I used to hammer at 1500 feet
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By the way, whoever told me to put the rudder servo forward in pull - pull configuration =he was right. Had the rudder servo been placed in the tail, I feel airplane would be way too tail heavy.
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Old 03-07-2021, 04:57 PM
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I used to hammer at 1500 feet
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United States, LA, Shreveport
Joined Apr 2012
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CG calculation

I found this:

Based on this, the CG point should be between 4" and 5.25" aft from the center of the top wing.

SO I am definitely tail heavy.

I also found that on AJ's WS, his AJ Proteus is at 5" aft from LE at the top wing. But, I do not know where the measurement of 5" aft is from? (center of wing or LE of wing near to fuselage side)
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Old 03-07-2021, 07:42 PM
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I used to hammer at 1500 feet
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More fun information

ran the motor:

APC propeller = 21 x 13E

at 250 feet elevation = 5730 rpm
this is equivalent to 24 pounds of thrust, on a 10 pound airplane! should be able to fly!
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Old 03-08-2021, 10:47 AM
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Have you considered a throttle-tech from tech aero?

I use one on my pattern plane. It helps maintain motor power by limiting voltage and keeping it consistent throughout your flight.

Since there is so much extra power available, this is hardly noticeable in my opinion, but it provides the exact same thrust available on the last maneuver as you had on the first.

Tony
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Old 03-08-2021, 05:13 PM
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I used to hammer at 1500 feet
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Thank you Tony, I will look this up and do some research on it. I appreciate you


Cam
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Old 03-08-2021, 06:25 PM
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I used to hammer at 1500 feet
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CG update

Verified

From the top wing
hatch off.

6" back from leading edge of wing, on the fuselage side.


thank you Andrew.
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Last edited by orthobird; 03-09-2021 at 09:42 PM.
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Old 03-11-2021, 08:28 PM
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I used to hammer at 1500 feet
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Cabane Struts

One final note.

the cabane strut mounts need to be epoxied into the sockets.

each mount has two carbon fiber pins. On the wings, there are two small sockets where the cabane mounts key into.

make sure they are oriented properly before gluing in.

the mounts are labeled top (x2) and bottom (x2)


finally, there are 4 small diameter pins.

the pins enter from the front to the back.

the pins are bent 90 degrees on one end. the other side is smooth and not bent.

The pins are self retaining, meaning, you do not need to place any collars on the other end. From what I have been informed, they will not fall off during flight.

this concludes the build of this beautiful airplane. I will hope to get it in the air soon. Pending weather and time.

I am certain lots of trimming will be required.

I also need to set the incidence of the stabs and make sure all the surfaces are level and that the throw is identical each way for each surface.
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Last edited by orthobird; 03-11-2021 at 10:13 PM.
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Old 03-30-2021, 07:03 PM
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I used to hammer at 1500 feet
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maiden was a success! Beautiful flying airplane!!
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Old 03-31-2021, 04:52 AM
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Yes, great looking plane. Would love to see some video of her in the air!
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Old 03-31-2021, 05:14 AM
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I used to hammer at 1500 feet
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Quote:
Originally Posted by rcbobp View Post
Yes, great looking plane. Would love to see some video of her in the air!
thank you. I did not mean the airplane was beautiful. What i meant to say was that the flight characteristics are awesome. I have never flown an airplane, that I can do an axial roll on the horizontal, without giving it rudder input. This friday, I will take her again and start the trimming, if weather is good. I got the trim card from CK aero. And I also set the incidence using the CK aero recommended digital angle protractor. He also made a 3d printed base for the incidence meter. IF someone is out there, I will ask them to film the airplane take off and flight. best regards and happy easter.
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Old 04-08-2021, 09:17 PM
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I used to hammer at 1500 feet
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I have over 10 flights on her now.

Getting funner.

Time to trim her out:

Flight of AJ's 2 Meter Proteus BIPE HD 720p (1 min 31 sec)
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