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rhodenga500
Install wire harnesses and components.

Homey666,

In picture 0054, you can see how the elevon and motor mount are connect to the same servo (Futaba S3152, 43g). I am using a 3mm carbon fiber rod to connect.
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mastermalpass086
It's looking gorgeous Rhodenga! Can't wait to see in action. You've really carried this one ahead of the RCP design.
BRB - Building another nosecone.
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Wildthing
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Install wire harnesses and components.

Homey666,

In picture 0054, you can see how the elevon and motor mount are connect to the same servo (Futaba S3152, 43g). I am using a 3mm carbon fiber rod to connect.

Awesome
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rhodenga500
Problems with the SU-34 Jet Project


1. Very tail heavy. Had to add 4 ounces in the nose to balance the jet (CG) with the landing gear down and using an Admiral 4S 5000mah, 40C battery. However, with the landing gear up the jet is very nose heavy (too nose heavy to fly).

2. Conducted a thrust test outside to hover the jet. With a 6045, 3 blade prop, the jet hovered less than 50 percent throttle for 10 seconds. Motor was extremely hot, too hot to touch and could smile the overload. 6045, 3 blade prop is too big.

3. Later, after cool down, conducted another thrust test with a 5045, 3 blade prop for 20 seconds. Took almost full throttle to hover the jet (using admiral 4S 5000mah, 40C battery). Motor barely warm to the touch.

4. Place the jet on the scale. Flying weight 87 ounces. Way too heavy (my objective was 70 ounces). According to online prop data, the maximum thrust is 90 ounces (45 oz per motor, with a 5045, 3 blade prop which is recommended) using a 4S battery.

Pictures of finished Product attached...
That mark /scratch on the nose (DSC_0061) is from handling the jet.
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homey666
Quote:
Problems with the SU-34 Jet Project


1. Very tail heavy. Had to add 4 ounces in the nose to balance the jet (CG) with the landing gear down and using an Admiral 4S 5000mah, 40C battery. However, with the landing gear up the jet is very nose heavy (too nose heavy to fly).

2. Conducted a thrust test outside to hover the jet. With a 6045, 3 blade prop, the jet hovered less than 50 percent throttle for 10 seconds. Motor was extremely hot, too hot to touch and could smile the overload. 6045, 3 blade prop is too big.

3. Later, after cool down, conducted another thrust test with a 5045, 3 blade prop for 20 seconds. Took almost full throttle to hover the jet (using admiral 4S 5000mah, 40C battery). Motor barely warm to the touch.

4. Place the jet on the scale. Flying weight 87 ounces. Way too heavy (my objective was 70 ounces). According to online prop data, the maximum thrust is 90 ounces (45 oz per motor, with a 5045, 3 blade prop which is recommended) using a 4S battery.

Pictures of finished Product attached...
That mark /scratch on the nose (DSC_0061) is from handling the jet.

Such good work. Maybe scrap the gear? That should save a bit.

Peter
YouTube Channel

flower666able
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Wildthing
Quote:
Problems with the SU-34 Jet Project


1. Very tail heavy. Had to add 4 ounces in the nose to balance the jet (CG) with the landing gear down and using an Admiral 4S 5000mah, 40C battery. However, with the landing gear up the jet is very nose heavy (too nose heavy to fly).

2. Conducted a thrust test outside to hover the jet. With a 6045, 3 blade prop, the jet hovered less than 50 percent throttle for 10 seconds. Motor was extremely hot, too hot to touch and could smile the overload. 6045, 3 blade prop is too big.

3. Later, after cool down, conducted another thrust test with a 5045, 3 blade prop for 20 seconds. Took almost full throttle to hover the jet (using admiral 4S 5000mah, 40C battery). Motor barely warm to the touch.

4. Place the jet on the scale. Flying weight 87 ounces. Way too heavy (my objective was 70 ounces). According to online prop data, the maximum thrust is 90 ounces (45 oz per motor, with a 5045, 3 blade prop which is recommended) using a 4S battery.

Pictures of finished Product attached...
That mark /scratch on the nose (DSC_0061) is from handling the jet.

I believe I have one of those motors, I was running it with a TGS 6X3 prop and 80A esc on 4S. For the larger(bigger grunt ) and higher kv motors I love the TGS 6X3 prop.


The 5000mah battery I have is 28 oz on it's own.
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rhodenga500
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Such good work. Maybe scrap the gear? That should save a bit.

Peter

Before I change this jet, I am considering the total possibilities and capabilities of the SU-34. The front carnards are active and could be adjusted (angled ) to cause more lift in the front of the jet at normal speed to compensate for the heavy nose.

I have built several smaller SU-34's and they took a beating from crashes, bad repairers and bad workmanship, but it flew great.

I need to conduct some research on this.
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