Tx conversion

[Red_Hamish]

Hello all, I've been toying with the idea of converting one of my 27Hhz Am Transmitters to operate with both sticks in the same plane I.e. Forward and Back, Tank Steering as it is more commonly refferred to. Looking at both of my Futaba Attack 2ER's from diffrerent generations one being 20+ years old and the other less than 1year old. The only one which it was possible to convert was the 20+ one. A simple procedure which involved removing the screwsholding the 2 parts of the case together, this alllowed the cable to be released to give more length. Then removing the 8 screws which held the face plate securely. Then rotate Channel 1 stick on right through 90 degrees. All of the screws were replaced in reverse order and hey presto job done. Now I've got a  dedicated Tx for my paddler, plus the advantage of adding to the fleet quite easily. I have to ask if it really is progress when the newer more ergonomic set cannot be converted at all or should I say without recourse to drilling and filing of the case. Anyway I'm happy withthe way it worked out and to be honest the changes can be effected at the pondside if the need arises to convert it back to normal operation.

cheers

Jim

[Eddy Matthews]

A definate case of newer isn't always better Jim!

It all comes down to the accountants that run firms nowadays - save a fraction of a penny here and a fraction there, rather than designing things that give the end user what they actually want!

[derekwarner_decoy]

Hi PD's - here is an electronic question for    

I am progressing ever so slowly with PS Decoy [as Brett reminded me two years ago]  :cry:, however progress is progress

The stephenson's reversing link on the JMC3H engine needs approx 18 mm of equivalent servo travel, but the standard JR537 servo's that came with the XF631 RC set whilst appeared to have sufficient torque to move the reversing lever, they rotate 60 degrees in 0.25 of a second, so the 90 degree servo standard travel happens in less than 1/3 of a second - so   this is TOO fast & will rip the reversing lever off  

So ever mindfull of new technology, searched the WEB  :computer and   found a compatible JR hi torque retract servo which specifies 1 minute and 55 seconds/60 degree rotation which sounds  

So I explain my quandry to the local Model shop manager [you know the one - sells areos & choppers & cars, but no boats] - so we sit down & have a  :gather - end result is 'yes, yes, yes' this new servo will be GREAT for your application - so I lash out the equivalent of 104,500 Korean WON & purchase the little treasure

Great specifications - can lift the equivalent of 8 litres of   @ 100 mm, yes torque is a massive 8.0 Kg @ 1 cm - but when I read closer I find on the box 1.55S/166 degrees  :rant  :rant

I try the unit & find yes approx two seconds a bit less than a 180 degree rotation so assume the 166 degrees is what they are talking about

Next is a call to the friendly Model Shop manager who explains no, no, no - the down loaded JR spec sheet I provided for a JR791 servo also noted that the JR971 superceded the JR703 servo - however the down loaded spec sheet was from an American site but the JR numbers used in USA are different to OZ & that's why I have a JR 713 servo which is the equivalent of an American JR703 -  I feel his comments are a little

I had hoped to use this JR713 retract servo via channel 5 which is a toggle switch one position = full rotation, opposite switch = full rotation & would be great for the smooth timing operation of the stephenson's reversing gear, but is there a method of electronically limiting the servo rotation :?:

Naturally the only answer offered by the friendly Model Shop manager was another no, no, no - you don't use a channel 5 switch for this, just use the channel 1 throttle -  I felt like saying 'you a  are a load of

Any comments greatly appreciated - Derek

[derekwarner_decoy]

-  must be the Friday night few   's & dark light as I got my UOM 'units of measue' a little out of wack

The original JR537 servos = 60 degree rotation in 1/4 of a second

The newer retract servo JR713/791 = a reported 1.55 seconds per 60 degrees  - so the latter is approx eight times slower & hopefully smoother than the JR537 - Derek

[Red_Hamish]

Hello all, I've not tried this yet but ActionKit hover here do a variable servo slowing electronic device. This apparently allows a standard instruction to a servo to be slowed to as much as 7 seconds! Yes Seven seconds. I think this would be a suitable piece to fit between Rx and servo giving you a controllable / adjustable response for the reversing gear with judicious use of the toggle switch and enough of a delay pre-set.

Quote from web-site:

SERVO SLOWDOWN’   adds time to servo travel with servo reverse function (P32) PCB Kit with case
This project uses a Microcomputer. Time can be added to servo travel time in increments of 1 second up to 7 seconds. It also has a servo reverser function..

With a screwed case 45.5mm x 32mm x 20mm it will fit in very small spaces. Full PCB kit, less servo lead.

The page address is http://members.aol.com/actionkit/products.htm

The products I've purchased from Craig Talbot (Action man    ) have always performed as anticipated and i can recommend his stuff.

Regards

Jim

[derekwarner_decoy]

Thanks Jim & Sandy [off line] - the real issue I have is that I can program the channel travel +150% to - 0% & the Tx retains the values in the visual display when I recheck it later [typically channel 5 landing gear to be used as the stephenson's reversing linkage with the 713 slow servo] is set @ + 18% of the 166 degree travel but when I actuate this I still end up with the full travel  :x  :?:  :x  :x  :x - I have the same issue with all channels so am a bit  :ohno  :ohno

The friendly Model Shop manager is nearly as helpful as Mr Unmentionable, so I have just penned a question to the OZ importer of JR products

Speaking of Mr Unmentionable, met with him again at the steam train site & ...... no you don't need any additional Certificate, so I say OK but will you test & OZ certify the boiler? & the response is 'no...... you don't belong to a club that is affiliated with....... AALS..... so I than him for his comments & walk away  :nah - Derek

[Eddy Matthews]

It sounds like this guy is about as useful as a smack in the mouth Derek. If it was me I'd vote with my wallet and take my business elsewhere!

[derekwarner_decoy]

Hi PD's & yes Eddie - the friendly Model Shop manager is 9/10's as useless as a 200 litre drum of , but it gets worse :!:  :?:  :!:

I acknowledged to the OZ imported of JR gear the the set was approx 20 months old but never set up until last night, so apart from the non functioning preset travel limits this morning I find the following

Rx throttle functions by Tx aierlon stick
Rx aierlon functions by Tx elevator stick
Rx elevator functions by Tx throttle stick
Rx rudder = Tx rudder stick = OK
Rx gear = Tx gear switch = OK
Rx aux 1 = functions OK
Rx aux 2 - doesn't work...... but it is only a six channel set so is OK

My aeronautical electronic engineering knowledge is severely limited   - so have penned another communication to the said OZ importer "O'Reilly Model Importers" - now thats a good Irish name - might give them a call on Monday  & VERY POLITELY :rant  & :rant in Irish just to make sure they got my e-mail

Oh BTW 1) - I have heard on the grape vine   , that ACS Engineering may well soon be producing refillable GAS tanks - please book my order Sandy as the first production unit & stamped with the usual number 74682

Oh BTW 2) GAS refill bottles in OZ appear to have a 4 mm diameter x 6 mm long  spear & carry the coding DOT2P 80/1330, DOT REG:4981 and also complies with AS 2030 - regards   :? Derek

[sandy_ACS]

Hi PD's & yes Eddie - the friendly Model Shop manager is 9/10's as useless as a 200 litre drum of , but it gets worse :!:  :?:  :!:

I acknowledged to the OZ imported of JR gear the the set was approx 20 months old but never set up until last night, so apart from the non functioning preset travel limits this morning I find the following

Rx throttle functions by Tx aierlon stick
Rx aierlon functions by Tx elevator stick
Rx elevator functions by Tx throttle stick
Rx rudder = Tx rudder stick = OK
Rx gear = Tx gear switch = OK
Rx aux 1 = functions OK
Rx aux 2 - doesn't work...... but it is only a six channel set so is OK

My aeronautical electronic engineering knowledge is severely limited   - so have penned another communication to the said OZ importer "O'Reilly Model Importers" - now thats a good Irish name - might give them a call on Monday  & VERY POLITELY :rant  & :rant in Irish just to make sure they got my e-mail

Oh BTW 1) - I have heard on the grape vine   , that ACS Engineering may well soon be producing refillable GAS tanks - please book my order Sandy as the first production unit & stamped with the usual number 74682

Oh BTW 2) GAS refill bottles in OZ appear to have a 4 mm diameter x 6 mm long  spear & carry the coding DOT2P 80/1330, DOT REG:4981 and also complies with AS 2030 - regards   :? Derek

 :hmmm

Hi PD's...Derek....What mode have you got your TX set to?

From your channel assignment listing, it would appear that it has not been set up correctly.

For Mode 1   Left stick should control throttle (up/down) and ailerons.
                   Right stick should control Elevators (up/down) and rudder.

For Mode 2  Left stick controls Throttle(up/down) and Rudder.
                  Right stick controls Elevator (up/down) and ailerons.

In either mode you may also find that the programming of travel and/or rate does not function for the auxilliary channels, but is restricted to servo reversal only, even though the computer appears to accept the inputs.

From your channel assignments it would appear that you are in neither mode...unless you have connected the wrong RX output to the wrong servo....  

If you set up for Mode 2 and assign the right stick up/down (elevator) channel to your Stephensons gear, you should then be able to adjust the travel and also control the speed by moving the stick slowly.
If you also disconnect the centring springs and put the ratchet plate into place on the rightstick you will have the ability to set the reversing gear into either forwards (up stick) or reverse (down stick) with neutral in the centre. An added bonus will be that you can also now use the notching up facility by moving the right stick closer to centre once Decoy is under way.

 :yeah  

Do I read your post correctly?..... :?:  :?:  :  :twisted: are you telling us that your boiler certificate is now acceptable...or what?....

More news on the gas tanks after New Year.....still finalising the details...   ....watch this space as they say.

Best regards.

Happy Christmas to all

Sandy.

[derekwarner_decoy]

Hi PD's - managed a few hours off work the other day & took my problematic unused JR R/C set to the Australian importer [in Adelaide] & what an experience, but not much use getting cross with them [but I am now a little bent OUTA shape with the Hobby Shop manager 2000km back home in Wollongong]

 :rant confusion 1) my state of mind was caused by the catalogue - which appears to have been translated from Japanese to English [by a Malaysian  national] then it is printed in Malaysia but for the American [English speaking] market & wouldn't you know it - the Yanks use mode 2 and not mode 1 & the catalogue instructions only show the TX set up with Mode 2 functions
 :rant confusion 2) the slow speed/high torque retract servo [$125.00 AUD] is not programable nor proportional so is totally useless for my JMC3H steam reversing gear :ohno

But all is not lost as the very helpful person [from O'Rielly] suggests a $27.00 AUD servo slow down {SSD} [yes up to 7 seconds Jim] will do the trick but me & not wanting to loose any more hard earned $, I  question the speed to torque relationship - electronics are beyond my understanding as the standard servo is demonstrated @ 90 degrees rotation set at a nominal 4 seconds without apparent loss of torque or thermal melt down - I say & thanks, purchase the SSD & spend the two hour return trip to Whyalla [as a passanger] contemplating just what to do with a 60x30x40 rectangular plastic object [with servo HORNS and sharp corners]  :music and complete with electrical cable - Derek