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  1. D

    Where/how to get a 12 to 25hp engine if you don't live in America.

    Hi my name is David Adeosun,I run a tiktok account (david.invents) where I build techy projects and my new project is to build an Hovey whing ding airplane (it has always been my dream to build an ultralight airplane) but I live in Nigeria and don't know where or how to get a small engine(13hp...
  2. D

    Flight verification.

    https://scontent.flos8-1.fna.fbcdn.net/v/t1.0-9/fr/cp0/e15/q65/61890665_866238287085049_4951750108606627840_n.jpg?_nc_cat=103&efg=eyJpIjoidCJ9&_nc_eui2=AeGxQ2eWuU5f0OZIDhiVkoe7xq_Pcift2xbFNC3WOWgLMBkySVb7wV3zBQr4VwFacfXXLZkUfWe8-tf2MyzyrTlvj8qh9n_RPoD_yK4_Tpazmw&_nc_ht=scontent.flos8-1.fna&oh=f67...
  3. D

    What's up with these webless ribs?

    Hi,I have seen a number of ultralights with wings whose ribs don't have webs e.g this Affordaplane: I once learnt that the webs in wing ribs help to transfer shear forces as well as wing loads on the wing skin to the spars,so my question is how will these "shear forces" be transfered from the...
  4. D

    Removing "useless" struts between the fore and aft wing spar of a goat4 ultralight.

    Hi people of HBA,my question is will there be any consequence if I remove the strut (A and B )between the wing spars of my goat4 ultralight?...as seen in this image below...
  5. D

    FILLING THE SPACE BETWEEN WING SPAR AND IN SLEEVE.

    HI there, the space between the wing spar and an insleeve is about 0.5cm.Hence,there is a visible separation between the wing spar and sleeve,so I decided to put pvc pipe inbetween the wing spar and its sleeves to fill the space between the spar and sleeve. My question is,is this really a wise...
  6. D

    Position of dragwires in wing bays

    Hello there����,pls take a good look at the small dots on the bays of this two-spar wing .my question is, is the drag and anti drag wire as seen in bay 1 supposed to connect to the root of the compression tube or to the intersection between the wing spars and compression tube as seen in bay 2...
  7. D

    Position of dragwires in wing bays

    Hello there����,pls take a good look at the small dots on the bays of this two-spar wing...
  8. D

    Is the wing attach fitting ever loaded with shear force?

    Do wing attach fittings of semi-cantilevered plane(eg a wire braced ultralight) ever get subjected to shear force?(for example during roll,does the centrifugal force of the wings load the wing attach fittings with shear?).
  9. D

    In sleeve:yes.....outsleeve???

    In sleeve tubes help to reinforce high stress areas in wing spars,my question is,is there anything like outsleeve tube? Isn't it better to just put a sleeve tube on the outside of the spar rather than cutting the spar then inserting the insleeeve tube?
  10. D

    Why do "ladder" wings have no compression strut towards their wing tip?

    https://scontent.flos2-1.fna.fbcdn.net/v/t1.0-9/fr/cp0/e15/q65/47010854_744236279285251_7750259899992375296_n.jpg?_nc_cat=104&efg=eyJpIjoidCJ9&_nc_eui2=AeGgDEMLKl1cgXWa68LDMFswYXRxZkiXDdeZ7BVTYxsMS_QHApCX6Gi56m3ijNgwyypHCYHCZlYexY73ndLqB3ISz6ho6elw-uDawl-EcIcOsEFNzfNxL9PfiGR3jhEB2pI&_nc_ht=sconte...
  11. D

    Compression strut?

    There's very little information on the internet on this crucial piece of a tube and fabric airplane : compression strut,my question is where is it's compression force coming from, is it being compressed by the wing struts/bracing wires,Can you explain what causes the compressive force that the...
  12. D

    Other purposes of landing wires.

    Apart from holding the wings up when on ground,do landing wires have any other purpose?
  13. D

    Difference between Vd and approach speed.

    Hello there, what is the difference between Vd (dive speed) and approach speed of an airplane. Secondly,can an airplane (Ultralight) descend with a nose high atitude? i.e without pitching its nose down?
  14. D

    The area to use when calculating wing drag.

    https://scontent.flos2-1.fna.fbcdn.net/v/t1.0-9/fr/cp0/e15/q65/45424047_730055424036670_6926738180553048064_n.jpg?_nc_cat=105&efg=eyJpIjoidCJ9&_nc_eui2=AeHOEtJEl4B-tfmNfcjpugjUb0FqAQd_Zf63qtTPAX-ke6LKmegZnPUWZ8E0-w1GwN99VPN07vGThTFrGlQLxnbqVLfcjsZMoazuAtBBMrDTLxQV9QL7cuVzIwrAQYtdh9g&_nc_ht=sconte...
  15. D

    Which is the limit load n1 or n2?

    This is the specs of an airplane,one thing puzzles me; n1 and n2.Which one as seen in this picture is the limit/ultimate load,is it n1 or n2? Thank you for your future response...
  16. D

    How to determine shear centre of a two spar tube abd fabric wing?

    I know what shear center is all about but not how to determine it,This https://www.homebuiltairplanes.com/forums/showthread.php?t=30623&page=3 reenacted my curiousity as to how shear center is calculated lets say for a tube and fabric wing with its front spar position at 0% of chord and the rear...
  17. D

    How to determine shear centre of a two spar tube abd fabric wing?

    [Duplicate]
  18. D

    Is the coefficient of lift during a descent always negative?

    What I am tryna ask is that : does the wings of an airplane produce negative lift during descent? Lastly what is the aoa of a wing during descent(not pitch attitude) in an Ultralight, is it neagtive,zero ?.Thank you so much for your time and answers
  19. D

    Uses of sleeve in the main and rear spar of goat3 wings

    Uses of sleeve in the main and rear spar of goat4 wings This is A Goat4 glider wings,it has sleeves in its main and rear spar,I was wondering what the use of the sleeeves were? Will there be any consequence if I don't use sleeves when building mine...
  20. D

    A draggy Ultralight or a heavy one?

    Hi there✋, am currently working on an Ultralight and was wondering if I should build my Ultralight with bracing wires or wing struts,I was puzzled as to which is better ; a heavier ultralight but sleek or a lighter ultralight but draggy(strut wired airplane) all with thesame 13hp engine.
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