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Old Oct 13, 2013, 04:38 AM
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Ashford. Kent. England
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D-sport delta variations... KFm4 aerobat

Descended from the combat Imp and my ME profile propjet, the D-sports first variation is for a blue wonder powered model..24 inch span from 3mm depron and a KFm4 wing
It has proved to be a superb flier, very easy , quiet and yet 3d capable..

The 28 inch size is a prop on the front model, all from 3mm depron..
flying it is easy , it flies on low power and will do most 3D limited by the fact it is elevons and rudder only
.
the maiden video...
D-sport maiden (10 min 9 sec)
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Old Oct 13, 2013, 04:49 AM
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build pics... Its a measure and cut job.. the main wing layer has a separate nose shape to fix on after lamination.. this is of 3 layers ..
the vertical fuzz is two layers thick, as is the rudder ...this lets me add a cloth hinge between the layers of the fin and rudder..
nothing complicated , its all glued with UHU por, the fuzz to wing joints are butt joints , which are glued with UHU then cool melt beads are run along in the joint angles
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Old Oct 13, 2013, 04:56 AM
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I then progressed by the addition of a wheel set...the AUW is now 9.75oz with a 500 3s lipo
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Old Oct 13, 2013, 05:07 AM
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variation 2 is on going..
this is going big , a 48" span with a high power setup..
the main wing layer will be 2x 6mm depron ...the KF steps will be 6mm single layers directly laminated.. the vertical fuzz will be either be two or three layers of 6mm..
On this version the body is extended and a tail plane and elevator is going on , this is intended for better 3D control..

edit...actual size made at 42" span ...48 was too big for me.. later re-calculating showed I had got my numbers wrong
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Old Oct 13, 2013, 07:23 AM
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looks nice davereap wanting for a long time already for a elevon 3D plane.
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Old Oct 14, 2013, 01:06 AM
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Can't sleep at night??
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Old Oct 14, 2013, 03:05 AM
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getting old...lol .... so Ive got no particular sleep pattern... and plenty of time for building..
I am still running a 48" size through the brain.. too big?? perhaps ... Its to replace the big F22 which is a very noisy prop in slot model..
the 48 gets me less area than the F22..by about 1.5sqft
Ive got a couple of motor choices for it.. one being the 600W motor from the F22
EDIT.. I MESSED UP THE CALCULATIONS
a review on the F22 gave 5.65 sqft and the d-sport at 42" span gets 5.6sqft, so that's the new size

Using elevons only for 3D is obviously not the best control option.. that's why Ive gone with a more extended fuzz and a normal elevator /rudder setup as an option..

here are the sketchup files for both options .... scale down the d-sport to a 42" span for the next build
It gives you the option of going to what size you want on what design you want
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Old Oct 14, 2013, 03:10 AM
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Norwich, England
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I think that your models are getting bigger & more aerobatic. It is interesting how our tastes change over time.

Do you own a Depron factory? Your build rate is phenomenal.
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Old Oct 14, 2013, 03:29 AM
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I am retired, so Ive plenty of time , but I do knock em out a bit fast sometimes.. 2-3 days for a model is I suppose average from concept to finished... some models are just silly quick .. the Nutball for example 30 mins start to finish.. it then takes longer to fit the gear
my depron I buy by the box full, but then some I will sell on to any flying buddies that are building..
My space here is restricted, so the size of the models is also restricted...and as I build, the models that are not being used get garaged or given away.. however some models are full time keepers...
Not only big models .... I also build small for indoors, and have two exceptional keepers at the moment one a smaller IMP and one a CF micro kite.. and also a small V wing which does indoor and outside equally well

the IMP shape was the basis for the D-sport and my ME163 profile jet.. although Ive moved the prop from a mid mount slot up to the nose for quieter and better performance..
The Imp as it was designed, is a great one for indoors.. needless to say I modified the basic Imp to a smaller lighter version... and you can bash and crash it as much as you like , its pretty much indestructible
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Old Oct 14, 2013, 06:13 AM
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I really like your "have a go" attitude to model building.

Watching with interest.
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Old Oct 14, 2013, 09:14 AM
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Depron is relatively cheap.. so you can experiment , and try to improve your models.. at worst you might waste a couple of sheets..
note my wings are nearly always KF sections .. simple and quick to build they always work well..
If you havnt come across KF then search the threads... don't miss out...
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Old Oct 14, 2013, 10:18 AM
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Another fine job, Dave,. Thanks for sharing all your work.
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Old Oct 14, 2013, 10:48 AM
Su-27's Rule!
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Quote:
Originally Posted by davereap View Post
Using elevons only for 3D is obviously not the best control option.. that's why Ive gone with a more extended fuzz and a normal elevator /rudder setup as an option..
want
can you elaborate why?
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Old Oct 14, 2013, 03:05 PM
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Generally 3d means extreme control activity often at very low speed. If you have say 2" of control movement available and that has to function as both an aileron and elevator then you have effectively reduced the amount of movement available for each if they are both in use at the same time.

This might be confusing but if you are asking for "up" and "clockwise roll" at the same time then "up" wants both elevons full up whilst right roll wants the right elevon to be up but the left one down. Unfortunately the right elevon cannot do double up and the left is being asked to go up & down at the same time. Models can fly like this but - many jets & deltas do - but it is not ideal for precision flying. Computer mixing can help, as in the real F22, but for modelling separate surfaces give better precision & extreme control.

The other thing is the moment arm - how far the tail is behind the wing. Generally precision requires a greater distance and activities like knife edge become much easier with reasonable fuselage side area and a longer moment arm. I suspect that this design as in the plan on post 5 might prove to be a bit short but we will see.
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