Xtreme Jets BD5 *Mods*
07-22-2011, 06:16 PM
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Xtreme Jets BD5 *Mods*
Due to the numberous pm's and emails I have gotten lately asking "How does your BD5 fly so good??" Here are the mods I did to improve it:
1. I mounted the engine to the bottom side of the mounting rails, added 2 washers (1/8") to the front of the motor mounting bolts to give it more up thust. Back of motor is lowered 1/4" and the front of the motor is lowered 3/8".
2. I matched the new thrust line of the motor to the exhuast pipe, the end of the exhuast pipe is 'pressed' against the top of the fuse in the tail cone section. I then cut off 2 1/2" of the tail cone on the end of the fuse. Added wooden spaces around the end of the exhuast pipe at 3, 6, and 9 o'clock positions.
3. The elevator stabs were set to 0 incidence, if you check before you glue them on the front of the stab is 1/8" highere then the trailing edge.
4. Added a aileron > rudder mix (curve), which increases the roll rate 100%. Example: full 1" right aileron throw there is 1/8" right rudder added.
5. Throws:
3/4" high rate elevator 5/8" low rate elevator
1" +/- aileron throw
1 1/2" rudder throw
2" full flap 1" take off flap
I have a JetCentral Rabbit KS for power, at 3/4 to full throttle there is soo much down thrust you would loose elevator control with 3/4" throw. Once I changed the thrust line to give it more up thrust, I have full elevator control (5/8" throw) at any throttle setting. NO more loosing elevator at top of loops, going vertical, etc.. Can hold a knife edge at 5/8 throttle, faster roll rates. Hopes this helps you all building this BD5.
1. I mounted the engine to the bottom side of the mounting rails, added 2 washers (1/8") to the front of the motor mounting bolts to give it more up thust. Back of motor is lowered 1/4" and the front of the motor is lowered 3/8".
2. I matched the new thrust line of the motor to the exhuast pipe, the end of the exhuast pipe is 'pressed' against the top of the fuse in the tail cone section. I then cut off 2 1/2" of the tail cone on the end of the fuse. Added wooden spaces around the end of the exhuast pipe at 3, 6, and 9 o'clock positions.
3. The elevator stabs were set to 0 incidence, if you check before you glue them on the front of the stab is 1/8" highere then the trailing edge.
4. Added a aileron > rudder mix (curve), which increases the roll rate 100%. Example: full 1" right aileron throw there is 1/8" right rudder added.
5. Throws:
3/4" high rate elevator 5/8" low rate elevator
1" +/- aileron throw
1 1/2" rudder throw
2" full flap 1" take off flap
I have a JetCentral Rabbit KS for power, at 3/4 to full throttle there is soo much down thrust you would loose elevator control with 3/4" throw. Once I changed the thrust line to give it more up thrust, I have full elevator control (5/8" throw) at any throttle setting. NO more loosing elevator at top of loops, going vertical, etc.. Can hold a knife edge at 5/8 throttle, faster roll rates. Hopes this helps you all building this BD5.
10-15-2013, 07:03 PM
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Great info on the BD5. Mine is due by end of the month (I hope). I had a Byron BD5 back in the day and it flew very well.. Did not have flaps so it was hard to slow down for landing. Other than that it was a super performer. Hope my SkyMaster does as well.
10-17-2013, 08:46 AM
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I am putting a KingTech K80G (18lbs. thrust). Should get the BD5 within two weeks. The information you posted will be of great help during the build. Plan on flying off my private grass strip.
12-24-2015, 11:38 AM
#8
guys, my friend just picked up a new xtreme jets bd-5 and i'm doing a James bond paint job on it .. we were looking at this thread and had a few questions.. the horizontal stab is showing 4 degrees positive incidence with the wing at 0 . we looked at the engine thrust mod and i talked to a very knowable friend and we came to the conclusion that the engine mod would only give the thrust line about 1/8 th of a degree . basically wouldn't make any difference. however the hor. stab mod would be the most effective. so i want to understand you .. you said that you zeroed the stab with the wing at the root? with 4 degrees of positive incidence ,it's no wonder the thing wanted to dive so bad. thanks for your help,WB_1
04-07-2019, 12:05 PM
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I am very happy every time I find information online about ongoing projects.
For my Skymaster / Extrem jets BD5 / BD-5 I used following adjustments from this thread:
5. Throws:
3/4" high rate elevator 5/8" low rate elevator
1" +/- aileron throw
1 1/2" rudder throw
2" full flap 1" take off flap
For mine new BD5 was this setup almost a crash after takeoff today.
My settings for second flight:
Elevator: 14 mm +/- and 60% Expo
Aileron: 28 mm +/- and 0% Expo
CG in this thread worked (120 mm)
I shortened the plane 4 cm and moved the turbine (P100) forward but needed 0,9 kg in the nose :-(
For my Skymaster / Extrem jets BD5 / BD-5 I used following adjustments from this thread:
5. Throws:
3/4" high rate elevator 5/8" low rate elevator
1" +/- aileron throw
1 1/2" rudder throw
2" full flap 1" take off flap
For mine new BD5 was this setup almost a crash after takeoff today.
My settings for second flight:
Elevator: 14 mm +/- and 60% Expo
Aileron: 28 mm +/- and 0% Expo
CG in this thread worked (120 mm)
I shortened the plane 4 cm and moved the turbine (P100) forward but needed 0,9 kg in the nose :-(
