• Welcome aboard HomebuiltAirplanes.com, your destination for connecting with a thriving community of more than 10,000 active members, all passionate about home-built aviation. Dive into our comprehensive repository of knowledge, exchange technical insights, arrange get-togethers, and trade aircrafts/parts with like-minded enthusiasts. Unearth a wide-ranging collection of general and kit plane aviation subjects, enriched with engaging imagery, in-depth technical manuals, and rare archives.

    For a nominal fee of $99.99/year or $12.99/month, you can immerse yourself in this dynamic community and unparalleled treasure-trove of aviation knowledge.

    Embark on your journey now!

    Click Here to Become a Premium Member and Experience Homebuilt Airplanes to the Fullest!

Search results

Find deals on amazon
Advertise with us
Find deals on ebay
This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.
  1. Jonny o

    3-pass radiators

    Thank you for pointing out that " emissivity " ( aluminum vs wood and etc. ) can affect data.
  2. Jonny o

    3-pass radiators

    A laser thermometer is a great way to check temps. I sand the test points to the same surface finish and then uniformly paint them with the same paint and number of coats. This increases the accuracy a great deal. I do this at industrial generator plants, my milking barn and in the airplanes...
  3. Jonny o

    So many reasons to use a P.S.R.U.

    How many thousand Robinson helicopters are running multi belt ( for redundancy) PRSUs ? Have you ever heard a mechanic who works on them suggest they have even a minimal chance of mechanical failure, not directly related to flagrant abuse by a pilot ? 15 years of working GO-480s and 100%...
  4. Jonny o

    What is the thickest airfoil ever used in an aeroplane wing for lift ?

    Thank you for the link. Read several papers there !
  5. Jonny o

    Aileron add-ons - What is this?

    “Best”at what Reynolds number? What is beneficial at slow speed can work the opposite at higher speeds. Saying a modification: Has more drag. Increases control force. Increases control authority. Increases lift and etc. are helpful.
  6. Jonny o

    Z Stiffened Panel Buckling Test

    Thanks for the excellent detail.
  7. Jonny o

    Slotted flaps, am I on the right track?

    Please post a photo, from the side, of the flap and aileron coves, with the surfaces at the limit of their travel. Looks awesome. Jonny o
  8. Jonny o

    Barnaby Wainfan newsletter

    Thank you for sharing the photo. Great comment and information. Tip fins would limit vortex development at all angles of attack. Having two fins/rudders seems like it would: 1. Diminish the inboard location of the vortex at high alpha. 2. Diminish the the size and force of the vortex...
  9. Jonny o

    Rudder Cables, Fairleads, Pulleys, Nylaflow Tubing?

    Huge thread drift on a 4 year old thread. Trying to explain to my daughter how the glacier that we were standing on, that was on a 2 degree slope is moving, was not successful. Her pointing out the rough surface and lack of ice pushing down from a higher level made me shut my mouth. Why...
  10. Jonny o

    Slotted flaps, am I on the right track?

    Looks great. Keep posting photos !
  11. Jonny o

    Slotted flaps, am I on the right track?

    Looks great. I make my bellcrank mockups out of plywood. They are square shaped, so I can put pivot point holes in wildly different positions to see how different positions work. Jonny
  12. Jonny o

    Slotted flaps, am I on the right track?

    Flyingforx, Yes, moving the attach point of the pushrod down, closer to the hinge point, will definitely add to the amount of pull it takes on the flap handle. Another option might be looking to see if you have room for a longer flap handle or could add more travel. More travel of the flap...
  13. Jonny o

    Slotted flaps, am I on the right track?

    The high speed flow from the propeller starts to increase DIAMETER as soon as the aircraft starts to move forward. 5/8 diameter at zero 3/4 diameter at 30 7/8 diameter at cruise If you dive the airplane and go faster than the air coming off the back of the prop the prop wash diameter will be...
  14. Jonny o

    Slotted flaps, am I on the right track?

    Man, you are flat going for it ! Awesome. If you could get your hands on some scrap spar pieces, I think it would be worth your while to mock things up. I buy wrecked wings for parts and keep the straight part of the spars. I like to build a mock up and leave it hanging on the wall for a...
  15. Jonny o

    Slotted flaps, am I on the right track?

    I don't understand what you mean by lace. Propeller flow is a circle not a rectangle. With the diameter of the propeller arc centered on the center of the flaps, you would have the greatest amount of flow hitting the flaps. The width of the high speed air, 3 feet behind the propeller, is...
  16. Jonny o

    Slotted flaps, am I on the right track?

    If the flap is not stiff in torsion then you need 2 bellcranks. A one piece leading edge without the cutouts for the Piper flap hangers will give you a lighter and very torsionally stiff flap. Several people have built flap hangers that connect as a truss to the rear spar and do not depend...
  17. Jonny o

    Slotted flaps, am I on the right track?

    Yes. Anytime there is an increase in speed there is a drop in pressure. There are dozens of places on an airplane cowling, wing, gear and etc. that cause negative lift. The trade off is that the over all lift is positive. But, that is only focusing on a very small part of the big picture...
  18. Jonny o

    Planning the adventure of a lifetime and hello from Germany!

    I flew a Rans Coyote with a 2 stroke coast to coast and then up to Alaska were I live. No radio, No cell phone, a compass and a road map. Plan nothing beyond the next flight. Enjoy were you are that day. If the weather is bad; tie the plane to a tree and enjoy the area that you are at. Meet...
  19. Jonny o

    Slotted flaps, am I on the right track?

    Pilot-34, NACA/NASA wind tunnel reports show the following at general aviation speeds and airflows. Remember that air acts very differently at 30 mph than it does at 100 mph. It acts even more differently as the airfoil gets smaller (chord). With no flaps and a propeller in front of the wing...
  20. Jonny o

    Slotted flaps, am I on the right track?

    Flyingforx, The nose of the flap in your first post looks really good. The nose of the wood mock up looks pretty sharp on the lower edge. With full flaps the separation point will likely be below the sharp edge. If so, there will be a high probability that the boundary layer on the upper...
Back
Top