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David Ovenden

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Posts posted by David Ovenden

    Throttle trim for electric scale models

    in Scale Matters

    Posted

    I'm looking for peoples' experiences on setting up the throttle on electric scale models. I'm used to I/C scale where the prop is always turning (hopefully) when the modelis in flight. With electric scale what is the norm? At min throttle does one keep the motors turning - or do you stop the current completely. What about the throttle trim - how do you experienced electric flyers set this up? With I/C I have reliable tick-over at mid-trim and set for engine stops at min trim. But this is not needed with electric so what's the norm?

    Plus I'm used to analogue throttle trim. I now have a new digital trim tx.Is there any difference in setting these up for electric?

    Your experiences would be appreciated.

    Thanks

    Kreutzer K-5 Air Coach

    in Scale Matters

    Posted

    I'm interested in finding details of a Kreutzer K-5 Air Coach tri-motor model that I have seen on You Tube. It appears to be powered by 3 xOS (or OS clone) fourstroke engines and is around 80" wingspan. Does anyone have any info on the model or the builder.

    PS It's not the huge 90lb model powered by 3 Moki 5-cylinder radials that is also on You Tube!!

    Thanks

    Flying Legends Gipsy Moth (1/4 scale)

    in Scale and Semi-Scale kits

    Posted

    Has anyone built one of these or have experience of flying one.?

    The kit was I belive originally designed by DB around the OS IL-300 4-cylinder in-line 4 stroke engine. I would be interested in people's experiences of using smaller egines. I intend to fit a Saito 150 in mine. Has anyone tried this model on a 120 four stroke?

    Any info appreciated. Thanks

    JR DMSS (XG series) receiver instalation

    in Spektrum/JR

    Posted

    Could do with some advice re instaling JR DMSS receivers (on the new XG radios) in metal finish scale models. The JR booklet sugests keeping the 2 aerials at 90 degrees from each other and away from metalic surfaces.
    With scale models using
    a) silver solartex
    b) all-over silver paint finish
    what is the recommended instalation.
    You can't easily get both aerails outside the fuselage (on larger models) and there is no extension lead possible (as there isn't a separate) satellite rx. What is recommended practice on these DMSS receivers

    Cessna T-50 Bobcat twin

    in Scale Matters

    Posted

    Back in 2005/2006 Duncan described in his Scale News column in RCM&E the design, construction and detailing of his 96" span Cessna Bobcat twin. Since his last column in early 2006 I've not seen or heard of the model. Does anyone how it flew or know where I can find any more details about its flying characteristics, power/weight ratio, comp sucesses etc. If Duncan is a forum member maybe he could let us know.

    I'd be interested in any feedback as I'm thinking about a T-50 Bobcat as a possible large (90" ish span) twin project for the future.

    VIve la France

    in All Things Model Flying

    Posted

    Bonjour Ernie,

    Sun is shining here too. Our flying field is in the middle of vinyards so there is not much about to cause interference, but I've had no problems on 35mhz, or 41, or 72.

    My local model shop is Ales Modelisme and the owner's name is Paul. Being English he will understand exactly what you want without resorting to French. The telephone number is 04 66 52 20 22.

    David

    VIve la France

    in All Things Model Flying

    Posted

    Another French resident here. I'm based near Ales in the Gard department. We have a local model shop and the owner is British although he has lived in France for 30 years now.

    I use 35mhz, 41 mhz and 72 mhz modules in my JR radio with no problems. Acording to the FFAM website 35.000 (ch60) and 35.010 (ch61) are now all agreed and legal for use in France and the previous users have relinquished use of said frequencies. See http://www.ffam.asso.fr/ct_frequences.htm#Décisions%20ARCEP

    David

    Duncan Hutson Cessna Bobcat

    in Scale Matters

    Posted

    Back in 2005/2006 Duncan described in his Scale News column in RCM&E the design, construction and detailing of his 96" span Cessna Bobcat twin. Since his last column in early 2006 I've not seen or heard of the model. Does anyone how it flew or know where I can find any more details about its flying characteristics, power/weight ratio, comp sucesses etc. If Duncan is a forum member maybe he could let us know.

    I'd be interested in any feedback as I'm thinking about a T-50 Bobcat as a possible large (90" ish span) twin project for the future.

    Fairey Flycatcher

    in Scale Matters

    Posted

    Jim,

    Many thanks for the very useful information. I think I have enough now to plan the hinging system. I will be using 4 servos (each with its own channel) and program the mixing (differential and flap mix) via the Tx. I do also have a JR Matchbox unit as well that allows independent, end-point and throw adjustments of up to 4 servos from 1 channnel, so that might be useful possibility too. However, I won't go in for a "real" cable link between top and bottom ailerons, so as to allow experimentation with independent flap mixing on top and bottom ailerons. ie Flap mix only to bottom aileron or to both. Will use the traditional shiring elastic to give the impression of the cable.

    The information I have suggestes that in tests around 8 degree flap was used for take off and I guess 15 degree on landing makes sense.(although this is not specified in the article I have) However, they certainly seem to have been pretty effective!

    "Take off to unstick distance was 363 ft with no flaps, and 190 ft with 8 degrees of flap. Minimum speed with flaps down was only 47 mph. Initial deck landing trials were conducted on HMS Argus in February 1923 and the behaviour of the aircraft was deemed to be exemplary".

    We will have to wait and see whether the models reacts in the same way.

    Regards

    David

    Fairey Flycatcher

    in Scale Matters

    Posted

    Thanks JIm,

    Once built I will be pretty warry of the flaps until I see what effect they have. I reckon the ailerons will become pretty ineffectve too once the flaps are down - with risks of drag-induced reverse yaw effect. May try mixing in the flap on the lower wing ailerons only to start with.

    Still would like to know what sort of hinging system the original used!

    David 

    Fairey Flycatcher

    in Scale Matters

    Posted

    I'm planning a Fairey Flycatcher model (scaling up a 44"  free plan featured in RC Scale International). The full size had ailerons on both top and bottom wings. All 4 could be drooped to act as flaps (presumably as a STOL feature for landing on aircraft carrier decks).
    By using 4 servos, one for each aileron, I can mix in flap to aileron at the TX and get working flaperons. Does anyone have experience of such a system? I'm interested too in how the full size hinging system worked - anyone know? Were they "freise" type or something different?
    I picked up the very useful Profile item from Ebay. I also have located an interesting book and a couple of mags with good colour detail and 3-views. However, the flaps are still unclear to me. It would appear that all four ailerons are quite wide and full span. they must have all worked in unison as the cable system linked the top and bottom ailerons together. There does not appear to be a separate inboard flap, so if all 4 ailerons lowered as full-span flaps that would have have quite an effect!

    The FAA replica would be worth a look, though it does seem to have "disappeared". Anyone got any photos of the wing/ail/flaps on this plane?

    I've now got the enlarged plans, the 5" Williams wheels, servos and engine lined up. So I need to made some sort of decision regarding the wing/aileron design before cutting balsa I guess!

    Any info appreciated

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