Jump to content

Delks

Members
  • Posts

    26
  • Joined

  • Last visited

Recent Profile Visitors

The recent visitors block is disabled and is not being shown to other users.

Delks's Achievements

12

Reputation

  1. Hi - the answer is yes the ribs will all be capped - it could even be fully sheeted for very little extra work/cost. "The Rival E" wing in the photos features NACA 0013 root section and NACA 0014 tip section and has slightly larger than 2 1/4" aileron chord - this results in the thickness of the leading edge of the aileron exceeding 1/2" so in this case it is probably cheaper to go the built up route but but cost was not a defining factor in the choice of aileron construction - it just didn't seem a good plan to throw away all that valuable balsa in the form of wood shavings and I liked the idea of a built up aileron. The wing section for the updated Breeze has not yet been finalised but will be 12% thick.
  2. Hi Kc Thanks for the interest. The holes in the ribs are in fact for a paper tube for the servo leads - I will install the tubes just before joining the wings (and cutting a hole in the root rib which I somehow forgot!). Both designs will be around 50" span and if things go according to plan the designs will be published in RCM&E. I also have in mind larger versions of both designs for 5s or 6s.
  3. I am currently working on updates for the Chilli Breeze/Wind and Rival designs and thought you maybe interested in the progress. The wing section chosen is NACA 0012 - several sections were trialled on the original Chilli Wind and this found to have the best flight characteristics but because the u/c was mounted in the wing I opted for a slightly thicker section with the u/c mounting in mind. I have posted a few pics here to show the new built-up wing structure that will be used on the updated designs and it is proving to be light and strong - no more wing-mounted u/c's!! Although this is the Rival E wing the construction with be common to all models. The up-dated designs are completely new versions of the originals but I think it would be a good idea also to update the originals to bring the into the 21st century way of thinking as they were good flying machines which were quick to put together.
  4. The updated Chilli Breeze and Rival designs are finally under way and, although a bit later than expected, we have visible progress! These will both be for 3/4s and the motors are the Hacker A30-10 XL 900kv and the Airtek hobbies 3548 900kv for props in the 12x6 - 14x7 range. The first of the models is the Rival E but the wing construction is shared by both models. Building for lightness whilst retaining structural integrity is a bit of a balancing act but I don't anticipate any problems in that regard but the wing construction, although very enjoyable, is time consuming and care needs to be taken. The new Rival E will have a more extrovert character than its big brother and have a broader appeal. I have been using the "new" balsa supplies from SLEC and although it appears to be expensive it is good quality and I have enjoyed working with it.
  5. I have been working on a new sport/pattern model for a while now and, although the prototype will be for electric power, an i.c. installation will (hopefully) be shown on the plans. I was interested to see how the components matched up weight-wise and here are the results: Relative weights of i.c. and electric power sources for small sport/pattern design of around 50” span and wing area 450”sq : i.c components magnum .36 inc silencer……………….. 345g engine mount…………………………….... 30g fuel tank (half full)………………………… .90g throttle servo………………………………. .15g nicad and switch harness………………120g ----------- total 600g electric power components motor………………………………………. 175g esc…………………………………………… 65g lipo (4s 2600mah) ………………………266g ---------- total 506g I will aim to be running a 12" prop on 4s but something like a 14"x7" on 3s would also be ok. If the above 4s set up was fitted into a standard Chilli Breeze and using modern lightweight radio gear a weight of 3lbs or less would be easy to achieve. The original model was designed around standard equipment with the servos weighing around 40 gms each. How times have changed - I am very tempted to update the Chilli Breeze to use the modern gear and electric power..............
  6. My error - the Quick Flash 20 was in fact 44" span but the first Rival was 48"span.
  7. Thanks for the kind words Nigel - cheque's in the post! There so many excellent sports designs knocking around and the number is increasing daily! Back in the 1970's the Kamco Kadet was a very popular trainer and was also an excellent all-round sports model. It was lightweight, very agile and with a .40 up front it had great aerobatic potential. David Boddington's Skyrider was also an excellent everyday flyerl but came in a bit heavier than the Kadet. Around that time an American modeller called Dean Swift was coming out with some small and very lightweight designs and his plans were being published by Model Airplane News. One evening in the early 80's I was thumbing through a back issue of MAN when I came across the King Foo. This was an ultra simple, very lightweight design for .15 glow motors. The article accompanying the plans was written in a very enthusiast style and it would have been hard not to delve a little deeper. This was the inspiration for my Quick Flash 20 design which was to be kitted by Ben Buckle. The aim was to make an ultra simple model that would provide a lot fun with a .20 on the front. The parts count for the kit was very low and due to the "straight-line" nature of the design it was quick and easy to build accurately. Ben placed ads in the mags etc and the big day came for the "launch" - it was all very exciting as anyone who has been involved in kit production will tell you what a relief it is to reach that stage. You could have knocked me over with a feather therefore when I learnt that the project had to be abandoned because Chris Foss had put the word out that I copied his Wot 4. I would agree that both designs have the wing mounted above the thrust line and both are tail draggers (like so many models before them) but after that they shared nothing in common. It was a pity because a lot of time and energy had gone into the project and model shop customers were denied the opportunity to try something a little different. There was also a Quick Flash 40 in the pipeline and the prototype of that alsoflew very well. So it was back to the drawing board and the first Rival was powered by an OS FP.40 and wing span was 48" - the same as the Quick Flash 20. The Rival for the RCM&E plan was around 55" span and was powered with a Rossi 40 - this motor was a really solid piece of engineering and also very powerful . The 48" Rival would make a nice little electric powered model as would it's larger stablemate. They both feature built up wings and simple all sheet construction and come out at a good weight.
  8. Hi KC Thanks for the message - sent a reply to you covering the points you raise - great to get different points of view! The Chilli Wind/Breeze were designed to be sport/pattern flyers and as such need to have a good amount of power on tap to get the best performance. I remember back in the late seventies in the Liverpool Club a chap had a 40 powered Kamco Kadet and, when flown by the resident "star pilot", it could perform 4 point rolls, rolling circles etc etc. It was around that time that I was doing some model building for Gloucester Models and one day I was handed a plan/foam wing panel pack to put together - it looked rather like a beefed-up Kamco Kadet but was in fact a Wot 4........ I was in conversation yesterday with the pal who has built several electric Breezes (using 4s battery) and he builds them as per plan (with built-up wing) and they have come out weighing around 3lbs. There are pros and cons for building very light but the main problem is that feather-weight models do not handle the wind very well and in the UK it is, generally speaking, windy rather than flat calm. Because of the shortage of of balsa I recently bought a little all-foam FMS Explorer which comes with all gear installed and ready for battery and receiver! This is a model spanning 40" with an auw of around 2 1/4lbs and the specified power set-up is: 3536 motor/3s 2200 battery/11.5" x 5" prop/40 amp esc. This model has been around for at least 4 years and there are plenty of reviews of it on the web. I don't remember anyone mentioning that it was overpowered but I do remember several negative remarks re its ability to handle windy days. Fortunately balsa supplies are back now so it is maybe time to put some of my ideas in to action. The new prices of balsa wood could well dampen the enthusiasm of a lot of would-be-builders but balsa models do have many advantages over foam so I guess there will always be enough people to pay the price and make it viable for suppliers to continue carrying stocks. I do agree that the choice of electric components is a constantly changing market but most suppliers offer advice and suggestions - you mention 4Max but there are plenty of others who do the same thing plus a host of on-line reviews and recommendations for the modeller to explore and seek enlightenment.
  9. Hi Nigel - Sounds like a nice, well thought out model and I hope you enjoyed flying it (RIP ?).
  10. Hi Jonathan - Couldn't agree more but how much "added lightness" are we talking about? I have just weighed a 36" x 4" sheet of 1/16" "medium" balsa- total weight 0.9oz and a sheet of similar 3/32" weighed 1.2oz........
  11. I was clearing out a some old bits and pieces today and I came across these photos which were sent to me by an enthusiast way back in the mid '90's - the note on the back of the top photo read: " Me holding the Chilli Breeze which I built from the RCM&E plan. Power is Magnum C.P. .25 and other club members cannot believe the performance on the motor, weight is 3lb 3oz (less fuel)." The model has a built up wing and an engine on the lower end of the range so I see no problem with a nice little 4s set up!
  12. Hi Nigel - quite agree with the points you make re weight saving. Don't forget that these designs were for i.c. power and I did not feel that they were overbuilt. The Breeze has 3/32" sides + 1/16" top and bottom sheeting whilst the Wind had 1/8"sides and 3/32" sheeting. Re a built up versus sheet tail - I have used both and found, like KC, that there was very little difference in weight. The choice of spruce or balsa longerons was suggested on the plan but I think most builders would have chosen balsa. I agree that there is the potential for introducing a c of g problem by mounting servos in the tail but it does seem to be quite a popular choice these days - I suppose people compensate by moving the battery? The one-piece model was not a serious suggestion but the access to the interior in this case would via a hatch in the top of the fuz so it would be quite a practical proposition - especially if you like wrestling! I remember the u/c on the Karma being very light and the Dave Brown wheels weighed very little too . Good to hear your thoughts. Cheers Mike i
  13. Hi KC - Many thanks again for the feedback in the pm's - much appreciated. A few more thoughts on electric powered Chill Breeze/Wind construction. On the subject of ply doublers the big question is: are they really necessary at all? With a view to simplifying construction even further why not dispense with the ply doubler completely and extend the 3/32" (or even 1/8") balsa wing seat reinforcement from the front F1 to to the rear extent of the ply doubler as shown on the plan- total length about 460mm - and this would also provide a good support for mounting the battery tray. It will also do away with the need for the use of "heavy rubbery contact glue" which would an extra bonus!!! A little bit of extra reinforcement around the captive nut plate would be a good idea. Assuming we now have wing-mounted aileron servos why not put the elevator and rudder servos in the tail end. And finally, has anyone built a "one piece" Chilli breeze with a glued-on wing yet? I have built a one piece model of this size in the past and it was very practical - although I must admit that covering was a bit of a wrestling match. The biggest problem at the moment is the lack of balsa supplies but the good news from SLEC and the Balsa Cabin is that new stocks will be arriving in the near future so let's keep our fingers crossed! Cheers Mike
  14. I don't believe that reducing the size of what is already a small ply doubler will have any measurable effect on the performance of the Chilli Breeze/Wind. There are several other weight saving measures that would be worth looking at: 1) Use a built up wing. 2) Lightweight c/f undercarriage (and wheels) attached to the fuz instead of the wing. 3) Substitute the elevator push rod for a Sullivan Golden Rod type of connection. 4) The model was designed to be capable of accommodating standard servos such as the Futaba 3001 (weight 45gms) because this is what the average sport flyer used at the time- we are lucky now to have a huge choice of reasonably priced mini/micro servos with useful performance figures. Receivers have also shrunk in size. 5) Making some lightening holes in the doublers will of course be another solution but, out of interest, weigh the material that you have removed...............
  15. That is an excellent solution if the components match - your dad had the right idea. Cheers Mike
×
×
  • Create New...