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About 109jb

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  1. 109jb added a post in a topic Locking tail gear   

    Matco worked very well for me on my previous Kitfox. They are reasonable in price and are for leaf spring like the airplane is built for.
    Another highly respected tailwheel is the "Hombuilder's tailwheel" sold by Aircraft spruce. They have leaf and rod style versions available.
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  2. 109jb added a post in a topic Grove gear benefits over bush gear?   

    Grove will be a bit heavier. They cost quite a bit too. Probably are a bit less draggy, but Avids and Kitfoxes aren't exactly clean airplanes.
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  3. 109jb added a post in a topic Robust Reliable Low Cost Avionics Options   

    Avare is fine for me. Others complain about some of the features, but I don't find it that bad. There are better ones out there but Avare is absolutely free. If you have an android phone or tablet you can simply download it an try it for free. Not a free trial, free forever. That's what I like about it the most. That said it does everything I need it to do. The only thing I would like is synthetic vision, but Avare doesn't have it. Naviator does and is free for CFIs. I'm a CFI so I may try Naviator but like I said Avare is fine.
    As for hardware to run Avare, I have it on my Android phone, the 10" tablet you see in the picture, and another 8" tablet I have. I've never found an Android device that didn't run it well. That 10" tablet in the picture is a cheap discontinued Lenovo model. It was the cheapest 10" they had at WalMart a few years ago that had a built in GPS. You will want a tablet with a built in GPS so make sure the one you chose has that.
    I also run Avare on a $75 import Vankyo tablet from Amazon. It runs Avare just fine too and is easier to read in sunlight than the 10" Lenovo. https://www.amazon.com/MatrixPad-S8-Android-Quad-Core-Processor/dp/B0868RQYTC/ref=sxts_sxwds-bia-wc-nc-drs1_0?cv_ct_cx=vankyo&dchild=1&keywords=vankyo&pd_rd_i=B0868RQYTC&pd_rd_r=0b67ee89-c44e-4cc0-90fe-5ffafcbc4b0f&pd_rd_w=p6OSi&pd_rd_wg=70vPn&pf_rd_p=84ce0865-d9ca-42e3-87ed-168be8f93162&pf_rd_r=E33SG9GPNJJ2CX3NSWPY&psc=1&qid=1607151999&sr=1-1-88388c6d-14b8-4f70-90f6-05ac39e80cc0
    I think the biggest thing for me regarding tablets in the cockpit is the sunlight readability. Some are better than others. You can get one that is VERY readable but they cost more.
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  4. 109jb added a post in a topic Robust Reliable Low Cost Avionics Options   

    I've got my G5 where it powers up in the panel on my Kitfox 4 project and readability is just fine. I'm going to be using the G5 with an cheap Android tablet (about $100) for the map screen. I have used this particular tablet with the Avare navigation app for about a year and it works great. Gives moving map, and if paired with ADS-B in also gives weather and traffic.  I chose the G5 primarily because I like the setup they have for autopilot integration, and it also functions as the altitude encoder for my used Garmin GTX 327 transponder. I can also connect the tablet via bluettoth to the G5 and get guidance from the tablet for the autopilot. All totaled I have about $6700 in avionics but that includes the G5 (~$1200), GMC507 autopilot controller (~$1100), 2 servos (~$750 each), the magnetometer (~$275, optional), the GTX327 ($300 on ebay), an EchoUAT for ADS-B compliance ($1399), and a new Artex 406 MHz ELT ($578), plus some odds and ends.  
    If installing the G5 as a standalone unit, it is 2 power wires and the pitot and static hookup is all. Very easy. I have not installed other brands but can say the G5 is easy.

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  5. 109jb added a post in a topic Fuselage landing loads (Kitfox IV) and cabane gear   

    the pipers use shock rings and the way they go on the tubes have to be 90 deg apart.

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  6. 109jb added a post in a topic Another Kitfox IV rebuild project   

    Yeah.  Been fighting getting the rudder pedals to swing smoothly. Too much drag in my opinion. They rotate and are probably smooth enough but won't fall on their own like I think they should. In the picture there is nothing holding that pedal vertically other than the drag on the pivots. I dorked around with it so much that I've now decided to do a little mod to make it better than the factory design. Not really anything wrong with the factory design, just that the original builder of this airplane did a shoddy job on it and the brackets are a bit cockeyed making the bolts not in line with the pivot tube. When I got it the bolts were loose and it was pivoting on the bolts in the aluminum  brackets rather than on the plastic bearing. The build manual says not to do  that. I'm going to put a full length stepped shaft down the middle of the pivot tube so that the bearings stay  inline. Hopefully that will take care of it. Might have  to egg a few holes where it bolts to the fuselage even though I loath egged holes. It'll work though. 
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  7. 109jb added a post in a topic Another Kitfox IV rebuild project   

    got the laser cut instrument panel that I ordered from sendcutsend.com and couldn't wait to test fit the stuff in the panel. I highly recommend sendcutsend. You simply upload a cad drawing of what you want, pick the material, pay, and about a week later a perfectly cut instrument panel appears on your doorstep. This panel cost $53 delivered.
    Wiring is progressing. The airplane had good wiring for the com and intercom, so reusing that. The harness for the G5 and the autopilot stuff is almost done. Still a lot of wiring to do still though.

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  8. 109jb added a topic in For Sale and wanted, you got it, I want it   

    WTB Matco MC-3 brake master cylinders

    I am working on my Kitfox 4 project and plan to replace the internal reservoir brake master cylinders in favor of a remote reservoir system. I currently have a set of MC-3 master cylinders for the right side and would like to get a matching set for the left side. matco no longer sells the MC-3, which has a 1/2" bore and now sells the MC-4 which is a 5/8" bore. I'd like to find a set of the MC-3 master cylinders. Perhaps some of you that have upgraded your brakes would be willing to part with your old MC-3 cylinders. Let em know.


    John Brannen
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  9. 109jb added a post in a topic Another Kitfox IV rebuild project   

    I'm using Garmin. It will have the following components:
    Garmin G5Garmin GMC 507 autopilot controllerGarmin GMU 11 magnetometerTwo Garmin GSA 28 servosI found that the G5 can be used as the encoder for a transponder,  so it  will feed altitude info to the GTX 327 transponder via serial data out. The serial data input and output can be set for different tasks and I will  use the serial input for inputting navigation data from an Android tablet running Avare or Naviator. This will give GPS steering for the autopilot.
    The G5 can replace the airspeed, altitude, vertical speed indicator and skid/slip ball, the weight gain will be minimal. Probably a pound or two, and that  will be saved because  I can lose the blind encoder since the G5 does that  too.
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  10. 109jb added a post in a topic Another Kitfox IV rebuild project   

    Progress is being made. I fabricated a new firewall today. The old one was badly mis-shaped and consequently did not seal to the cowl really at all. In order to make sure the cowl was holding its proper shape I had to make a new windshield and cleco it in place. I then cut a 1/4 plywood blank for the top of the firewall that was a bit undersized and clamped that in place. With the cowl on I used a 1-3/4" diameter cable pulley and with a pencil ground to fit in the pulley bore I ran it around the inside of the cowl. This gave me a line 7/8" offset from the cowl. From there i was able to cut the cowl exactly 3/8" undersize which allows for the bulb seal that I am going to use for the edge seal. The bottom part of the firewall is basically straight cuts so I jus winged that. I didn't build the firewall like the plans say because I don't like the idea of drilling into the fuselage tubes and riveting. I had welded on about 20 tabs for attaching the firewall and welded up all the holes from the previous firewall attachment. It attaches to tabs on the top horizontal tube, center horizontal tube, and the tube under the rudder pedals. The engine mount will also clamp it. This way, I can also get to the nuts underneath for the rudder pedals by just taking the screws for the firewall off from underneath. I'm terrible about taking progress pictures so i only got the final result. I also got the ELT and antenna mounted. Not a big deal but I decided to mount the antenna inside the fuselage and here is how it came out. I also got the autopilot servos mounted and made some temporary pushrods to get things figured out. Everything looks like it is going to work well. A couple picture of those are attached too. 

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  11. 109jb added a post in a topic Rotax 582 mod 17 spark plugs   

    ever mind. I missed the mod 17 part. Don't know what they use
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  12. 109jb added a post in a topic Another Kitfox IV rebuild project   

    So I took a few minutes today to weigh my new gear and the stock Kitfox IV gear. The stock gear legs are 15 pounds for the pair, uncovered, no axles, brakes or wheels. The new gear is 20 pounds, also no axles, brakes or wheels. So looks like I'm about 5 pounds heavier than stock, but 4.3 pounds lighter than a Grove gear which the website says is 24.3 pounds.  I'm happy with that.
    On another note, i finally got the fuselage all sandblasted. Weather was not cooperating, so I had to hang plastic sheet in one section of my barn to get it done. I also got the primer coat on tonight, but didn't get any pictures with the cloud of paint mist. White urethane will go on tomorrow I hope. I really hate painting tube structures and will be glad when its done.
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  13. 109jb added a post in a topic New Machine   

    Awesome Allen!! Get back in the air dude!
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  14. 109jb added a post in a topic New Rotax 670 Install   

    While it is true that ethanol based fuel is recommended by Rotax over Avgas, don't forget that fuel system compatibility may be a more influencing concern for what fuel to use. There are many cases of folks with older fiberglass fuel tanks reporting that their tanks and/or the tank coatings were not compatible with the ethanol based fuels, leading to fuel system contamination. I have an older Kitfox IV (912 powered) that has the Kreem lined tanks and just sold an older Kitfox IV (582 powered) that also had the Kreem lined tanks.  I am leary of  using any fuel with ethanol for the reasons stated above. On my project airplane I am contemplating cutting the tanks open, removing the Kreem liner, and re-coating with a know ethanol safe liner so that I can use auto gas with ethanol. In my particular case, non-ethanol based auto gas is not readily available to me, so going that route would be very problematic. If I do reline the tanks then I would opt  for auto gas with or without ethanol, but it would probably be ethanol based due to availability. On the 582 powered airplane I ran Avgas with decalin lead scavenging additive. On that airplane the plugs stayed clean and I didn't notice any excessive buildup of deposits when borescoping, but I didn't own/run that airplane very long, so don't have a long track record with the Avgas/Decalin fuel. Just food for thought.
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  15. 109jb added a post in a topic Another Kitfox IV rebuild project   

    So for the bungees I haven't settled on a diameter or number of wraps. What I can say is that on my particular design the bungees will need to provide about 1.58 times the force of the original bungee setup to provide the same amount of "cushion". I plan to figure out the amount of stretch the original bungees had and then tailor the new bungees to provide the same amount of force. This is based on the geometry of the gear as shown in this drawing.

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