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  1. Z

    Cutting out airframe tubes - whats the best saw blades?

    It's been a a while since I've been back here. I've been planning modifications to my airframe. I have to cut out some of the 5/8" 4130 tubes for the modifications. I had already cut a few 3/3" tubes with a hacksaw and this took forever and wore the blades out very fast. I would like to know...
  2. Z

    Flaps on a Super Cub - Why a gap strip?

    I have been trying to figure out the best configuration for flaps on my 85% Super Cub project. I would like to keep them as close to the full size Super Cub as possible. On the Super Cub, the retracted and extended flap position is fairly close to the wing and in addition they have a gap strip...
  3. Z

    Carburator Expert Needed For A Few Questions

    My engine is a Teldyne 4a084 84CI engine that came with a Tillotson HR 181a 041 carb which has a 1 1/4" bore and also has idle and High speed adjusting needles and a built in pulse pump. Apparently this carb is good for up to 25 CI per cylinder. My engine falls in at 21 CI per cylinder. I've...
  4. Z

    Wing modification and washout

    I will be modifying the wing somewhat on my one of kind 85% Cub project. There are no plans for this design although it is similar to a few others, but the builder used a scale outline very close to a real cub. This plane was flying at one time according to the guy I got it from who also knew...
  5. Z

    MAJOR - MAJOR MODS - Lengthen and Widen

    I have a one of kind 85% Cub project I am rebuilding and modifying. It's very similar to the N-3 Pup in construction with 4130 fuselage, but with all wood wings. I will be adding flaps and a wing folding system. The plane originally flew with a Rotax 503, but I have 4 cylinder 4 stroke for it...
  6. Z

    Folding Wing On A Cub Design....I'm not crazy!

    Yes even though the Cub design is not inherent to folding wings, I have been working on a system to convert to folding wings on my Cub project for a long time, thinking about the pros and cons of the different methods. Why folding wings on my Cub? Our airstrip does not have any hangers and I do...
  7. Z

    Ivoprop Bolts Safety Wired...Why Not?

    I have noticed that in all the photos I see of Ivo Props, none have safety wired bolts. I was considering new bolts drilled for safety wire for my Ivoprop since I will be using a 9" - 10" spinner that covers the bolts and inspection will not be as easy. Safety wired bolts will be a problem...
  8. Z

    General Electric E-33 Electric Tach Question

    I have a General Electric type E-33 electric 4500 RPM tach I plan to use on my Teledyne 4a084 engine with the stock or slick 4220 magneto, with the following info: Indicator Tachometer Electric Single Type E-33 Spec No 21263 Mfg No: 8DJ13AKD Sub 33 I have not been able to find any information...
  9. Z

    4a084 engine tachometer drive.

    I'm looking for the tachometer drive for Teledyne 4a084 engine. ZZ
  10. Z

    Frayed Cable Ends - What to wrap them with?

    I am in the process of rebuilding/modifying a project. I stripped the covering off the wings and found the ends of the cross bracing cables were not heat shrinked and are fraying. I have been trying to find a solution to cover/wrap them. Heat shrink tubing is no longer an option since it would...
  11. Z

    Varnish Removal - What to use?

    I will be modifying my wings to add flaps while I have them stripped for inspection. I will need to remove the varish from the wood where I need to glue new wood parts, but I can't find anything on what people are using. The ribs are built up 1/4" x 3/16" spruce and the spars are solid spruce...
  12. Z

    Holes for Fittings In Solid Wood Spars

    I have been trying find information or standards for holes in solid wood spars for fittings, but haven't been able to find anything so I hope someone hear can help. I am planning on converting my wings to have flaps for my 85% Cub and am concerned about the new hole size, distance from other...
  13. Z

    Changing Aileron type to frise

    I'm in the process of rebuilding an single seat 85% Cub design. I stripped the covering off the wings to inspect and do some modifications. One of the modifications is adding flaps and changing the push rod ailerons to full cable. While designing the flaps I kept thinking about the ailerons...
  14. Z

    Need Help - Welding Rod for 5052 Aluminum Gas Tanks

    The guy at the welding shop only had a aluminun flux core TIG rod and didn't know what I should use for 5052 alloy. Can anyone please tell me what welding rod works best for O/A welding 5052H32 .040 Aluminum sheet for wing tanks? I'll most likely use some rivets to preassemble it and then weld...
  15. Z

    Need Help for Cub Type Trim Actuator

    I have been considering a Cub type screw jack trim system for my 85% Cub project. I have been looking at 24v (altenator is 24V) Linear Actuators with a weight around 2 - 3 pounds. They seem to be a good choice with no complicated cables and pulleys with travel limit shut off and I need added...
  16. Z

    Need Help Welding 4140 Matco Axles to 4130 Landing Gear Struts

    I'm not sure if this is the right place but... I was looking at the Matco 3/4" tube axles which are made from 4140. I will be O/A welding them to the struts and gussets. From what I can find, 4140 has 1% more carbon and is stronger. I can't find any information if the welds should be treated...
  17. Z

    Trouble Deciding Wing Folding Design

    I want to convert my 85% Cub project to have folding wings. The problem is I can't decide on which method. The wings presently mount with brackets protruding from the wing root into the cabin and are secured to the frame with bolts. Method 1: Folding horizontal from rear spar like the Kitfox...
  18. Z

    Smith AW1a Torch and Tips Questions

    I got a Smith AW1a handle, AW201, AW203, AW205 tips, HTP2 gauge set and the RA921 and the Kevlar hoses are ordered. After reading though the booklet, they show the AW200 tip for up to 1/32" and AW201 for 1/32" I called my supplier about a AW200 tip and they got back to me after talking with...
  19. Z

    How are cables attached to cable ends?

    I'll need to either replace the entire cable or add extentions on my rudder cables, but I have not been able to find out how cables are attached to the cable ends as in the photo. Is this something I can do at home or do I have to have them attached professionally and if so where? ZZ
  20. Z

    Need Help Determining Vertical Suspension Travel

    I have a single seat 85% Cub project which is much like the N3 Pup that I have to build landing gear for. I want to be able to have good off field landing gear performance, but I'm not sure how much vertical wheel travel it should have. It will use bungee cords on Cub style struts with big...
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