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new smaller (composite) Sebart Avanti XS

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new smaller (composite) Sebart Avanti XS

Old 01-30-2019, 11:17 PM
  #101  
Neil Guildford
 
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I didn’t like this either so I hysol a T nut to the inside of the wing and bolt through the wheel well.
Old 01-31-2019, 04:28 AM
  #102  
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I used the screws supplied in the kit, a sheet metal screw about 20mm long, but as the wing tube is a little shorter than the depth of the hole in the wing I leave the tube in one wing so that when I slot it in the hole in the other side is always in the correct position, but I am at some point going to change to Neil's method I think, just as I think its a better solution, having said that I have a bout 40 flights on mine now with no issue.
Old 01-31-2019, 02:48 PM
  #103  
FlorianDo
 
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I am in the same stage, and had similar question, thanks to you all for the info, T nut and bolt through wheel well it is for me too!
Old 01-31-2019, 08:13 PM
  #104  
Steve Collins
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I went ahead and drilled and tapped for 4-40 size bolts.
Old 02-02-2019, 08:25 PM
  #105  
Steve Collins
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Default Avanti XS

I ran into a minor issue that needs to be addressed. Those who have already finished and flown their XS probably already discovered this but for those still outfitting theirs, here is what I found:

Just before I drilled and tapped the holes for the wing retention screws I pushed the spar into the first wing to be drilled all the way to the stop at the end of the spar tube. Drilled, tapped, and threaded the bolt through the hole. So far so good. I then put the other wing on and drilled and tapped the hole and likewise threaded in the bolt. All seemed good at this point.

When I removed the second wing I discovered that the threaded hole was right at the edge of the end of the spar! I pulled the spar out of the other wing and found the threaded hole in the spar was about 1/2 inch from the end of the spar.

The fix is easy. I cut a piece of spruce stock and glued it to the end of the spar where the hole was 1/2 inch from the end which has the effect of positioning the other end of the spar 1/4 inch further into the wing. Turned the spar 90 degrees to drill the new holes which are now both approx 1/4 inch from the end of the spar.

Who knew the spar was too short!!!!??

While fixing the hole problem I discovered that the hardwood dowel plugs in both ends of the spar were loose and easy to push into the spar. Pushed them both out of the spar easily with a long length of music wire. I used gap filling CA to put them back into place. They had originally been glued in with hot glue!!! When will they ever learn not to use that stuff on these planes!!!

First picture shows the problem caused by the spar being too short making the hole right at the edge.

The 3rd pic shows the easy fix of gluing a spacer to one end of the spar.

The 2nd pic shows the resultant fix. You can see the original hole and the hole in the new location.
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Old 02-23-2019, 04:29 AM
  #106  
didiwatt
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Those of you using Electron ER-30 retracts in your XS, are you happy with them on this plane.

I have a set of them on a 10lb jet and they are great. Just seems they are a little small for the XS at around 18lbs.

Mfg recommended weight limit is 16lbs

Anybody using the larger ER-40's?
Old 02-23-2019, 07:15 AM
  #107  
Steve Collins
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I haven't maidened mine yet but the ER-30 retracts certainly appear to be up to the job. Apparently Electron thinks so as well. Anything any larger than those won't fit the mounts.
Old 02-23-2019, 11:23 AM
  #108  
cmjets
 
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Hello friends, here the newest tank for AvantiXS, 3L kero + 1L smoke + UAT.

,



Old 02-23-2019, 03:23 PM
  #109  
Len
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The Electron 30’s are perfect on the XS.
Len
Old 02-23-2019, 04:52 PM
  #110  
didiwatt
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OK, thanks guys for your responses.

Mine is no due to be shipped until next month but I wanted to get the retracts ordered.

What size tires come with the XS Electron package. Any room to squeak a little larger tires for grass.

Which nose steering option should I order?
Thanks
Old 02-25-2019, 01:25 PM
  #111  
Joe1199
 
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I finished my Avanti a few months ago but with a house move and various other things I have only had 2 flights.
I am going to fly it again in the next few days so was wondering what advice people have for landing in particular. My first flights were from a full size runway so fast landings were no issue, as it was a new model I wasn’t confident on the slow flying characteristics yet but my normal field is a little bit tighter!

i have seen videos of the Avanti landing at walking pace, I assume this is with 50 degree flaps, is there any advice for slow speed/approach on the model?

thanks
joe


Old 02-25-2019, 01:46 PM
  #112  
FlorianDo
 
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Originally Posted by didiwatt
OK, thanks guys for your responses.

Mine is no due to be shipped until next month but I wanted to get the retracts ordered.

What size tires come with the XS Electron package. Any room to squeak a little larger tires for grass.

Which nose steering option should I order?
Thanks
The electron combo comes with 50 mm nosewheel and 70 mm mains. Steering is with servo bracket on the nose retract. I don’t think you need anything bigger for grass, but I haven’t flown mine yet to tell you my experience. I think electron figured out their combo pretty well for the XS.
Old 03-09-2019, 09:29 AM
  #113  
FlorianDo
 
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Hi, i am about to install engine and pipe finally, but before i do, anything to consider for heat insulation ? Alu tape or bvm heatshield anywhere ? The servowires are ptfe in kevlar sleeve so that’s taken care of.
Old 03-09-2019, 02:46 PM
  #114  
A7Bldr
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On mine I insulated the tail wiring as you said. For my own piece of mind I brushed in Heatshield above the engine, since there is no hatch there.
Jim
Old 03-10-2019, 05:47 AM
  #115  
FlorianDo
 
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Thanks Jim, I guess that´s a good idea, just for peace of mind. Given the double pipe plus all the air flowing outside the pipe backwards, any shielding in the back apart from servo wires seems overkill to me.
Old 04-03-2019, 01:07 PM
  #116  
didiwatt
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For those using Electron gear, the factory said the nose gear steering plate is made for a Hitec HS225.
They are only rated for 6v. My system is high volt. I cant seem to find a high volt replacement. The 225 measures 32.4x16.8x30.8mm. Anybody else find a good HV sevo to fit.
I hate to file the aluminum plate for a larger servo as you have pre drilled and threaded holes.
Old 04-03-2019, 03:37 PM
  #117  
FlorianDo
 
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Originally Posted by didiwatt
For those using Electron gear, the factory said the nose gear steering plate is made for a Hitec HS225.
They are only rated for 6v. My system is high volt. I cant seem to find a high volt replacement. The 225 measures 32.4x16.8x30.8mm. Anybody else find a good HV sevo to fit.
I hate to file the aluminum plate for a larger servo as you have pre drilled and threaded holes.
Hi,

Just ask Electron for a servo plate fitting your 15 or 16 mm servo of your choice. I use a Graupner HBS660 HV Servo for steering, and fits perfectly in the servo plate for 16 mm servos.
Old 04-03-2019, 07:02 PM
  #118  
Steve Collins
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I had to grind a little on the servo mount to make the servo I used fit into the hole. I was still able to use the threaded holes. I did not use an HV servo though.
Old 05-20-2019, 09:51 AM
  #119  
FlorianDo
 
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Default About to finish..

It has been silent around my build, but I am about to be 100% ready. Only remaining items: final radio / throw programming, wing fence mounting and final balance check. Hopefully maiden next weekend.

Below some pictures of my radio / turbine install. Thanks to all of you that shared build pictures to inspire me to do it a little different. Notice this is a 1.46:1 scale model of the legendary Freewing Avanti S :-)

One Q about balancing: I noticed that when balanced empty on the gear to the recommended 230 mm (with hopper simulated full with some added weight there), the plane is extremely light on the nose wheel.

So, does the 230 mm refer really to gear down, hopper full ? This is how I arranged all equipment to match that CG setting. Just to verify how you guys did it..

Thanks,

Florian




Old 05-20-2019, 12:01 PM
  #120  
swk550
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Really slows down for landings.
I now have five flights on my Avanti xs. Mine balances with the gear down, full UAT and maybe 1/4” of fuel in the tank. Balance is very nose light. Flies great. It does good four point rolls. My best slow speed landings have been with full flaps and only ~30% fuel in the tank. When inverted at full speed only need slight down elevator to keep level. My KingTechs K-85g2 is a perfect turbine for this plane. Plenty of vertical. Did numerous top hats, stall turns and large loops with ease. I love this plane.

Last edited by swk550; 05-20-2019 at 12:20 PM.
Old 05-20-2019, 10:01 PM
  #121  
Neil Guildford
 
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I agree, with a full hopper and gear down the recommended CG works well.
Old 05-22-2019, 06:52 PM
  #122  
caliber90
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I am about to start the building of my XS. I am going to put K120 into it. I see in the tail the servo wires are exposed and subjected to the heat from the pipe before going into the tube. Is there anybody who put some sort of heat shield in the tail to protect the servo wires from the heat?

Thanks,
Old 05-22-2019, 07:41 PM
  #123  
Steve Collins
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Caliber90,

Don't know whether you have a choice of which engine to put in your XS. I was originally going to put a P-120 in mine but I listened to all the folks who said the P-120 would be too much engine for that airframe. A fellow jet pilot strongly suggested the Kingtech K-85 which is what I put in mine and it has all the power it needs and then some! Smaller, lighter engine, smaller fuel tank, fuel tank exactly over the CG, smaller tailpipe, ....... all add up to a significantly lighter airframe. Lighter flies better, lands slower, just sayin'.

Last edited by Steve Collins; 05-22-2019 at 07:43 PM.
Old 05-23-2019, 08:17 AM
  #124  
FlorianDo
 
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SWK550, Neil, Thanks for the feedback, and sweet looking color :-) Probably leave my Wing fences off, and see how it goes at maiden.

Caliber90,

I´d suggest to use at least silicone insulated servo wires in the back, even better PTFE insulated, which resists to about 300°C. I used a Kevlar sleeve to provide additional heat protection to the servo wires in the back. Glassfiber (not with resin!) sleeve would work too.
Old 09-06-2019, 10:32 AM
  #125  
Joe1199
 
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I really love this plane with a Jetsmunt 100xbl, in my opinion probably does not need the extra power, here is a video of mine flying with the 100


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