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  1. BenoitLescot

    Radial engine - cylinder helmets type cowling

    I am looking for references regarding engine cowling, more specifically radial, cylinder helmet type of cowling like on the pictures below. I'm looking for information relating the the actual cooling of the cylinders as opposed to aerodynamic drag info. Could I just replicate the cowling bellow...
  2. BenoitLescot

    Floats CofG

    Any ideas where common seaplane floats center of gravity is located ? (metal/wood/composite shouldn't really make a difference) I'm talking about the floats on their own, without struts, I'm guessing CG would be about 35-40% length due to heavier forebody.. couldn't find anything in my books...
  3. BenoitLescot

    2 seat tandem - mid wing spar/cockpit arrangments

    hi, been a while now I've posted here, always keeping an eye though ;) I am toying with the idea of a 2 seat tandem with a mid wing. Playing with drawing arrangements at the moment and trying to figure out a way to have the spar go through the cockpit and not having the legs in the same...
  4. BenoitLescot

    Naca report 640, I must be missing something

    hi, trying to follow through naca report 640 "THE AERODYNAMIC CHARACTERISTICS OF FULL-SCALE PROPELLERS HAVING 2, 3, AND 4 BLADES OF CLARK Y AND R. A. F. 6 AIRFOIL SECTIONS" In the appendix I am trying to follow the example p 569, first column. I can't get a J0 = 1 ?! J0 = (V/nD)0 V = 190 mph...
  5. BenoitLescot

    Concave hull references

    Hi all, Been looking into concave hulls recently, I can't seem to find much about them in my docs, anyone has any pointers when it comes to estimating loads ? (not looking into stability or spray) I am very well aware of the "classic" formula seen in the FARs or equivalent but most applications...
  6. BenoitLescot

    Fuselage weight estimate

    hi everyone, I have completed the guesswork on my fuselage structural weight and would like to invite your opinion and critics. I say guesswork because we're still at the preliminary design stage and I don't want to go through all the load cases just now, so I choose to apply sensible material...
  7. BenoitLescot

    New amphibian, assystem

    Not intended to make profit, but instead used as technology demonstrator and to improve company workflow.. still interesting to follow the development (if at all possible), a few interesting details such as "no step hull" using the landing gear door (monowheel) slightly extended to create a...
  8. BenoitLescot

    how can the DA42 be so heavy ?

    comparing numbers here I have always been surprised at the high empty weight of the DA42, and let's talk about the DA42L with the Lyco engines before we start hearing "yes but it's diesel". The Dyn aero twin-R made its first flight few days ago, it's almost 200% lighter (425 vs 1291 kg), and...
  9. BenoitLescot

    Wright Cyclone R-2600-20 engine SFC

    Hi, Can anyone point me towards SFC information for the above named engine ? Be reassured, this is not for my project, but for analysing older aircraft performance.
  10. BenoitLescot

    Ramp geometry - Landing gear design

    Hi there, Am working on the landing gear for my project, I was having a thought about the ramp geometry, basically I want my gear to be as low as possible for obvious weight reasons, but one specific about flying-boats is when pulling up the ramp, a picture better than 1000 words so here is...
  11. BenoitLescot

    GA Riblett airfoils .. again ... looking for correct data

    I know this has been discussed in the past, howerver I couldn't get an answer to this question : Is there somewhere wind-tunnel data from any of the Riblett GA airfoils ? If not, is there proof that the published data in the book is inacurate ? There are a few aircrafts out there flying with...
  12. BenoitLescot

    Fleetwings Seabird amphibian

    Hi there, Looking for any technical docs relating to the Fleetwings Seabird, most interested in the landing gear, also would give a good look at any videos of water takeoffs / landings to spy on spray characteristics, finaly, if there is any pilots reports out there on the flying...
  13. BenoitLescot

    Looking for : "The VenTure"

    Hi everybody, I'm looking for the full report for the Virginia Tech project "The Venture", it was presented in 1997 for the Nasa AGATE program, got 3rd place. Although there is a website for it, it does not give access to the potentially much more resourceful appendices (300 pages). I...
  14. BenoitLescot

    multi engine wing design considerations - help needed

    Hello everybody, Slowly developing my 6 engine replica, anyone knows where I could find material relating to multi-engine wing design ? Here are considerations I have in mind : - turbulent airflow over extended area => laminar airfoil not good idea - lift distribution calculation...
  15. BenoitLescot

    Changing carburettor location

    Hi, I'm focusing on the Rotax 503 and Simonini Victor 1 for my project, both use the Bing carburettor , but I'm out of space, engines are to be mounted in engine nacelles on the wing, idealy round with the prop axis in the middle. I already have to enlarge the nacelles to fit the engines but...
  16. BenoitLescot

    33-40 hp 4 stroke engine ?

    hi there, I am looking for a light engine between 33 and 40 hp, I'm not too found of two strokes engines as they seem to have tendency to seize and they need premixed gas/oil, also not too sure if they could wistand 3 hour flights @5000ft. My design is of the multi-engine kind, thus when...
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