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H9 SU-31 Test Flight

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Old 08-27-2002 | 12:29 AM
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Default H9 SU-31 Test Flight

Well it finally happened. My H9 Suk finally broke ground. It took 18 oz of lead in the nose as well as moving the rudder servos mid ship and running a pull pull system. Motor a ZDZ 80 Twin. Bambula 26-10 prop pulling 5800 RPM. Servos JR 8411's on rudder and elevator with JR 8231's on the ailerons. Motor started great as usual and ranged tested for the 30th time just to be safe, idle as well as full. Taxied to the end of the runway and slowly advanced the throttle. The plane was off and flying great at 1/4 throttle. Lets trim it out Now. Two clicks right aileron, two clicks right rudder and 1/2 click up elevator (now that one is hard to find). Wow this thing is smooth. The elevator is very effective even on low rate. Do a couple passes to make sure trim is correct. Lets do a roll good two second roll on Low rate aileron. Let kick it up to mid rates on the trusty 10sxII. A little to fast for my liking on mid rate but very axial. Lets point it up and feed in the power. UP UP and UP some more. All this at 3/4 throttle. Pull the throttle back and feed in some rudder at the stall, oops gave the rudder to soon but it did end up nose down. I did a roll on the down line and pulled level. The motor started to sound a little different. I kept in the air and continued around at less than 1/4 throttle. I was talked in to bringing it in by my trusty co pilot, thanks dad (SPUCK5644). Over the runway and in reduce the throttle wow this thing just wants to fly. I finally got it to set down very gently tail first. As I was rolling out the motor stopped. Co pilot went to get the plane and check it all over. Everything checked out fine. Still have both plugs and plug wires firmly attached. I then proceeded to fly my profile for a little while before I tried to try the Suk again. This time no fire. I then pulled out the good ol Sullivan Dynatron with a Miller Reduction drive. Got the pop I was looking for with the choke on and then it would not start again. Not sure what is going on but the motor wont fire with out choke. I plan to check the carb tonight look for any problems. Overview, I would advise people not to buy this plane that way the price drops and I can buy a dozen for back ups. Ok H9 its time for a good Looking Edge to come out or reduce the Ultimate so I can put a 80 in it.


Chris Puckett
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Old 08-27-2002 | 09:52 AM
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Default H9 SU-31 Test Flight

Way to go Rcavi8ter! I've got my eye on this plane, just waiting till the price drops<G> Yeah right!! I do love the looks of that big ole cowl up front.
Best of luck with her!

Doug
Old 08-27-2002 | 11:43 AM
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Default Test Flight

Congrats! I knew you'd love it. Even with my GT-80 the thing flies great. You have a good idea about a "back up".
Old 08-27-2002 | 09:59 PM
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Default Problems Solved

Well after I got the plane down to the shop I started trying to find out what was causing the fuel problems. I checked the fuel level and it was good. Tried richening the carb a little. Pulled the fuel line off the carb and I noticed that I was getting fuel every once in a while but not a very constant flow so I decided to pull the tank. Once I got the tank out I pulled the tank plug and noticed that the fuel line pick up had come off and the engine was only getting fuel when the fuel was above the brass in the tank. Well I hope to get it up again this weekend and put a few flights in on it and really ring it out. Wish me luck as I do it all over again.

Chris Puckett
Old 08-28-2002 | 11:08 AM
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Default H9 SU-31 Test Flight

rcavi8ter and tp777fo, I am putting hitec digital 5625's in the wings and i was going to used the stock 1" al. servo arms that came with them but they seem to short and don't line up with the hard block in the ailerons. They hit right at the edge. What servo arms are you using and what is the length. I don't think it would be wise to install the control horn at the edge of the blocking. I also don't think it is a good idea to angle the push rods so they line up with the center of the blocking in the aileron. I need help, I am having trouble finding longer al. arms for the hitec servo. Also what about the elevators it calls for 1" arms. Are the al. hitec okay for here or should i find a longer arm like 1.25" any ideas where to look?
Old 08-28-2002 | 12:01 PM
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Default Arms

I used the H-9 ones called for in the instruction, I believe they are 1" . The holes did not line up in the middle of the block but I thought the location was sufficiently strong for the control horn. So far I have not noticed any problems of any kind with the airplane. In the last issue of MAN I saw a company that offers aluminum arms but did not notice the name. Good luck.
Old 08-28-2002 | 12:23 PM
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Default H9 SU-31 Test Flight

I dont think H9 makes arms for the hitec servos are you using jr servos? Do your arm measure 1" from end to end or from the spline to the end.
Old 08-28-2002 | 01:43 PM
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Default Servo arms

jpeters,
I'm rcavi8ter's pitguy, (dad). We picked up the aluminum servo arms from Creek Hobbies while we we in Toledo. I believe the website is www.creekhobbies.com

Steve
Puckett Model Aviation
Old 08-28-2002 | 01:48 PM
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Default H9 SU-31 Test Flight

what is the lenght of those arms? did you use them on the ailerons? if so did the control horn go through close to center on the hard block.
Old 08-28-2002 | 02:41 PM
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Default Servo Arms

The servo arms that were used on the Ailerons as well as the pull pull rudder system were all purchased from Creek Hobbies (Great Guys). The length of them is close to 1.5 inches. With this you can mount the horn in the middle of the block if you wish. I mounted mine closer to the front edge. For the pull pull system that too was picked up from Creek Hobbies. It is a great piece all machined out of Al. with a ball bearing arm attached to it. By moving the rudder servos forward I was able to reduce the amount of nose weight by over 1.5 lbs.


Chris Puckett
Puckett Model Aviation
Old 08-28-2002 | 02:45 PM
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Default H9 SU-31 Test Flight

i have heard the ones from creek for hitec have a little slop (play) in them. are they 1.5" from end to end or from end to spline? what do you know about airwild arms
Old 08-28-2002 | 05:23 PM
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Default H9 SU-31 Test Flight

Dubro makes a composite arm for Hitec servo's, package comes with several different length arms. I am using the longest arms for aileron,elevator and rudder servo's on my SUKOI and they work great. They are very strong with no slop on splines. Package of arms cost less than $10.00 .
Old 08-29-2002 | 03:06 AM
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Default H9 SU-31 Test Flight

Guys take a look at the nelson hobbies arms or the SWB arms from Wisconson. SWB makes fine aluminum arms from 3/4 - 2". They fit very tight and are very strong.

Howard
Old 08-29-2002 | 04:23 AM
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Default H9 SU-31 Test Flight

Howard,
Which ones are you running on your Extra? I need more elevator throw on my DP extra.
Old 08-29-2002 | 05:12 AM
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Default H9 SU-31 Test Flight

SWB 1 1/2 on elevator and 1 1/4 on ail. Great day of flying today. Good calling/critique from Dave Villwock.

Howard

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