R/C airplane weight Question

getback wrote:OK guys I am on board with the batt. But my charger charges RX 4.8 VDC  50mA Only NI-cd  4.8/500mha   And my Opening is 1.5" sq. to put the battery up front . CG 3" off LE no battery.  Which batt. can I use ? The Batt. I took out was 111Gm. I am thinking the 720 what is NiMH. http://www.radicalrc.com/category/Receiver-NiMH-Packs-19  As you can tell I know nothing about interchanging stuff I always use what comes with the system. Eric thanks you

Isn't the NiCd battery less than 1.5 inch Sq. ?  My AA batteries are NiMH and they are about 1.25inch sq. x 2 inch long. If you insert the NiCd battery into the 1.5 inch Sq. hole it should slide fore and aft? Try it first and slide fore and aft to adjust for CG. Maybe you have padding around the battery pack and it is larger than 1.5 inch sq. I use very thin foam padding wrapped 2x around the battery pack and it is still less than 1.5 in. sq. Maybe take the padding off and try the bare batteries to see where the CG is. That may solve the problem. Maybe the CG is forward of a bulkhead and there is no problem. my 2cents.

happydad  trying to help

getback wrote:stupid me put the wrong size for the hole is 1.1/4" Sorry I fixed it in the post , I am working on the Zero at the same time ,,, go get some AIR!! OK Eric

o.k. all is forgiven. reset.

how big is the battery pack with and without any foam insulation?

hd

I haven't done business with these people, but..

4.8V AAA NiMH square pack

Check out the dimensions/specs.

(Edit) That pack is less than 1/2 the weight of the one you have.. and twice the capacity. At just over 3/4" square.. it will fit in your opening. The AA square-pack would too.. (@1.1" sq.) There's a good chance you could use the charger you have.. but I'm not sure about that. I believe that most NiCd chargers will charge NiMH packs of the same voltage/capacity, without any trouble.

roddie wrote:I haven't done business with these people, but..

4.8V AAA NiMH square pack

Check out the dimensions/specs.

(Edit) That pack is less than 1/2 the weight of the one you have.. and twice the capacity. At just over 3/4" square.. it will fit in your opening. The AA square-pack would too.. (@1.1" sq.) There's a good chance you could use the charger you have.. but I'm not sure about that. I believe that most NiCd chargers will charge NiMH packs of the same voltage/capacity, without any trouble.

I used to get AA and AAA NiMh batteries, only, on eBay for less than $1.00 each. I typically used the 2/3 AAA battery at  400mahr  700 mAhr and around $4.00 for a pack of 4. Sometimes with a JT, I think, connector. It is red and 2 wire about .15 inch spaced. Maybe called the JST connector. I made them and sold on eBay for a while. They also make AA in 1/2 and 2/3 sizes with appropriate mAhr ratings. I don't have the mAhr ratings handy. Search NiMh rechargcable AA 1/2 or 2/3 or what ever size you need.

edited 9:24a.m. PST 9-9-15 - to correct mAhr rating and add a picture.

here is a picture of the 2/3AAA 700mAhr batteries I use for my small, 30 inch wingspan, planes. 2.25 inch long X 1.250 inch high X 0.50 inch thick in the 1X4 configuration and the battery pack came as shown without a connector. In the 2X2 config. it would be 1.125 sq. X 1.125 inch.

as purchased except it didn't have this connector.

Happydad but can't sleep.

getback wrote:The Batt. I took out was 111Gm. 2"x2.1/4"  no pad just batt. I am more concerned about the charging though, there are ones that will fit with less run time 260mha , Did you look at the link where the batteries are ? Thanks Eric

the battery pack must have been a sub C battery pack. Each cell is usually 1 X 1 inch.
Maybe the pack was C cells, they are longer and larger in diameter. maybe 1 x 2 inch.

The new NiMh are probably 4X what they were in the 1980's.

happydad    

getback wrote:I am looking at this one with jr conn. , but I have another smaller plane and need to ck. if I need to get sq. or flat pack.  http://www.ebay.com/itm/FLOUREON-4-Cell-AAA-Ni-MH-4-8V-1000mAh-RC-Buggy-Battery-Pack-w-JR-Plug-Connector/231210774411?_trksid=p2046732.c100040.m2060&_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D20140107095009%26meid%3Dc0ea5f3a0ad6442b83786df1fd231c0d%26pid%3D100040%26rk%3D2%26rkt%3D4%26sd%3D261462333373  I will get to it soon other crap to do now  Eric New ins. and papers to fill out  

can't you add your own connector? It's easy and fun. Of course I have had an entire career doing little stuff like this.
   If you need any help please feel free to PM me. Obviously I would have to get the particular connector you need, JR, but I do have several types like JST and Futaba which is common to most radios today.

happydad    

Mark Boesen wrote:I think you'd be fine, back in the early 80's i had powered this plane with a golden bee, two full size servos and a 500 mah battery, barely keep airborne, added a Tee Dee and it flew great! Later swapped out battery for 250 mah battery, even better.

That was my very first RC airplane. Got it and a two channel Futaba radio from America's Hobby Center back 'in78. I'll build a couple more someday.

The Nostalgic Mark

getback wrote:Here's the other plane from a swap meet  36" w/s 23" fuse heck there's plenty of room in there it has micro servos (came with it)        Don't know the name ,,, think the flat pack will be better for weight distribution . Eric

Yup.  Another one of my favorites, the Bee-Tween.




I have just too many planes I want to build.  They'd better find that way to rejuvenate us all pretty quick...

The Old and Decrepit Mark

getback wrote:Damn it man , Thanks Mark I will put that name with the plane /// swap meets already built 20- install radio and GO FLY !! I don't know if the servos are good and don't have any micros of my own right now but this looks like it would be a fun plane for an old fart to get out and just have some FUN ! My neighbor cross the street has a nice big field out back that will bee were I will fly these babys , I love a two channel or three for some easy no worry flying . Eric  

I'd love to see Mark's plans library! He probably has most; if not all of my small-model (1/2A) plans/plan-images.. I'm sure. Most were CEF inspired.. but most are control-line. I've bought RC equipment over the years.. that I've never used Eric. The first was a used Futaba "Conquest" 4ch. AM aircraft set w/4 FP-S33 micro-servos in 1993.. for $25.00... The servos alone are still worth that. Fast-forward.. A Futaba "SKYSPORT" T4YF FM system.. right around the time that spread-spectrum was making the scene. Since then.. I invested in a Tactic "Any-Link" 2.4GHz (spread-spectrum) converter and matching RX (6ch.) It utilizes your radio's square-style trainer jack, if so equipped. Cables for Futaba, Spectrum and JR were included with mine.. and others are available. This frequency upgrade is safer than straight FM.. from an interference standpoint. I'd call it a good 1/2A system.. being that the range is 1000ft. The system was less than $100.00.. actually it cost $70.00 including the 200mAh LiFe rx pack that I bought. (all from Tower in 2012)




Here's an example of a lightweight reedy-powered RC flight-pack.. (the nano-servos are Great-Planes/ElectriFly ES-50's)  



With engine.. only 21gr more than that flat AA-pack you have. Oh.. and check out the antenna on the receiver.. nice; not to have to route-it/mount-it.. worry about it.. being severed in a mishap.. and looks nicer for photo-ops. too.

[/quote]

I'd love to see Mark's plans library! He probably has most; if not all of my small-model (1/2A) plans/plan-images.. I'm sure. Most were CEF inspired.. but most are control-line. I've bought RC equipment over the years.. that I've never used Eric. The first was a used Futaba "Conquest" 4ch. AM aircraft set w/4 FP-S33 micro-servos in 1993.. for $25.00... The servos alone are still worth that. Fast-forward.. A Futaba "SKYSPORT" T4YF FM system.. right around the time that spread-spectrum was making the scene. Since then.. I invested in a Tactic "Any-Link" 2.4GHz (spread-spectrum) converter and matching RX (6ch.) It utilizes your radio's square-style trainer jack, if so equipped. Cables for Futaba, Spectrum and JR were included with mine.. and others are available. This frequency upgrade is safer than straight FM.. from an interference standpoint. I'd call it a good 1/2A system.. being that the range is 1000ft. The system was less than $100.00.. actually it cost $70.00 including the 200mAh LiFe rx pack that I bought. (all from Tower in 2012)


Here's an example of a lightweight reedy-powered RC flight-pack.. (the nano-servos are Great-Planes/ElectriFly ES-50's)  



With engine.. only 21gr more than that flat AA-pack you have. [/quote]

So how do you like the Tactic AnyLink radio system? I have 2 of the transmitters, but no receivers. They cost $20.00 each plus shipping and that's a bit too much on my limited budget. The equivalent OrangeRX receiver is less than $10.00 when on sale and the lemonRX receiver was only $5.50 each shipped when you bought 5 pieces.
   I would like to try the AnyLink on my old Futaba FT-7UAF transmitter that has adjustments for almost everything like the newer 2.4GHz systems do now.

happydad  

[/quote]

So how do you like the Tactic AnyLink radio system? I have 2 of the transmitters, but no receivers. They cost $20.00 each plus shipping and that's a bit too much on my limited budget. The equivalent OrangeRX receiver is less than $10.00 when on sale and the lemonRX receiver was only $5.50 each shipped when you bought 5 pieces.
   I would like to try the AnyLink on my old Futaba FT-7UAF transmitter that has adjustments for almost everything like the newer 2.4GHz systems do now.

happydad  [/quote]

Just trying to show Eric what's out there for options. That "Bee-Tween" could be a test-bed. I'll bet once he gets the Honker in the air.. he might want to give the other old girl a whirl! (don't take that the wrong way )

getback wrote:Roddie I know about the limited $$ I was looking at the anylink 2 and according to there chart   http://www.tacticrc.com/anylink/anylink2-chart.html they want work on my OLD radios , I think the youngest one I have is 1991 conquest FP-T4NBF and a Attack FP-T6NFK . Heck I have some older than that upstairs SOOO it is what it IS for now , I do have a super cub mini park flyer a friend gave me , I need to do some work to it after him and his kids done a number on It it has a tactic radio but I don't know the range I am thinking 900' or less I will look it up when time comes . One of these days things will bee better and I can infest in a more up to date system,,, wish you would build you a plane put that system in it and go fly have some FUN I know it seems mission impossible but its not . Eric  

I think the requirement for the Tactic AnyLink to work wit any transmitter is the transmitter must be able to put out a PCM signal. Not positive. That is why I am looking to borrow a tactic receiver to use to test the AnyLink with my Futaba TX which can put out an FM or PCM signal to the AnyLink.
Happydad