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Beginner Jumper

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Old 06-29-2006, 12:32 PM
  #26  
edge_pilot
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Default RE: rcskydiving.com Beginner Jumper

Most of the guys drop them from trainers. Alot of Kadet seniors, Telemasters, and planes similar to these. I use a giant Stinger for my drop plane, this plane can take up 3 skydivers at once. Some use scale planes to make it more real. I have seen skydivers taken up on Stik's before. All in what you have or your buddy has. Just about anything that can carry the weight people will use.
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Old 06-29-2006, 08:07 PM
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Default RE: rcskydiving.com Beginner Jumper

ok, thanks for the info on planes
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Old 07-02-2006, 08:56 PM
  #28  
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Default RE: rcskydiving.com Beginner Jumper

My issue with the trainers that I have was the ground clearance...That is why I used my 1/4 Scale plane. I was also thinking that if you could mount the guy up on top of the wing using the rubber bands that the wing uses to hold the drop box. and then the pilot rolls inverted when it is time to drop and then Super Dave (that is my guys name after he burned in on our first drop ) will be on his way, then the trainer rolls right side up and then lands for another load.
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Old 07-18-2006, 09:14 AM
  #29  
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Default RE: rcskydiving.com Beginner Jumper

Today I finally got my drop plane.

It is a MULTIPLEX BIG LIFT II, almost 100" span, around 5 kilos dry and powered by a Zenoah G38.

It should handle my jumper fairly easily, probably more than one if... I just had more than one ;-) .

It is an ARC but will be queued right now.
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Old 07-18-2006, 10:00 AM
  #30  
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Default RE: rcskydiving.com Beginner Jumper

Sounds like a nice plane for jumping! I beleave it will take up 3 atleast, my plane has less wing area than you and it's no problem for me. Anytime you would like to add to that jumper family just let me know. Have fun and may all your jumps be under canopy!
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Old 07-18-2006, 12:30 PM
  #31  
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Default RE: rcskydiving.com Beginner Jumper

I'll keep you updated!

Just in case my family grows... where did you place the boxes for the other 2? Ok, under the wings but where exactly. I have flaps.
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Old 07-18-2006, 01:11 PM
  #32  
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Default RE: rcskydiving.com Beginner Jumper

Here are a few pics of my drop rig. All custom built by us.
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Old 07-19-2006, 03:07 AM
  #33  
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Default RE: rcskydiving.com Beginner Jumper

On the CG, aren't they?
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Old 07-19-2006, 06:24 AM
  #34  
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Default RE: rcskydiving.com Beginner Jumper

Not quite, but as close as we can get them.
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Old 08-24-2006, 12:21 PM
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Default RE: rcskydiving.com Beginner Jumper

Giacomo, did you drop your man yet? I bought mine a year ago. Of the first dozen jumps, only 2 opened up fully. The rest opened up to some extent but were of course uncontrollable. I have just re-motored my Senior Telemaster with a 90 4-stroke. I also have installed an Eagletree Seagull wireless telemetry system to monitor the planes altitude. The final modification for this year is a FMA Co-Pilot to keep the wings level. When the plane was up over 500' and right over head the pilot was unsure of its orientation. It also allows the jump plane pilot to watch the jumpers descent for a while without risking diving /spinning the plane.

Hopefully I will get some successful jumps this season.
T.P
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Old 08-24-2006, 03:03 PM
  #36  
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Default RE: rcskydiving.com Beginner Jumper

TP
You should try to go to Muncie on Sep 16 & 17 for a skydiver rally and competition. We should have about 20-25 guys there with all sorts of jumpers and jump planes. Dave Naylor has made a great suggestion that we have a forum at the site for everyone to exchange info and help new or potential RC Skydivers. Come on over and get all your questions answered! Look on page 177 of MA Mag for the rally listing and details. It's a lot of fun!!![8D]
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Old 08-28-2006, 11:07 AM
  #37  
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Default RE: rcskydiving.com Beginner Jumper

ORIGINAL: Tom in Cincy

Giacomo, did you drop your man yet?
Sorry for the dealy in the reply Tom... no, I didn't drop the dude yet, focused on seaplanes at the moment and still have to get the drop plane ready to fly (have to buy the G38 for it).
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Old 03-25-2008, 06:59 AM
  #38  
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Default RE: rcskydiving.com Beginner Jumper

Hi gentlemen!

I still have to drop my guy but I took some time to update him before it is too late!

I read the Hitec HS-77BB low-profile servos were not enough so I switched to higher torque BlueBird BMS 705 MG.

I also re-installed the 'internals' to correct some mishaps I did it at first: the servos are now all the way back and a little further out so I can lower both arms more before the servo arms touch.





I also added some beard to my guy to have him a little different from the others...



In the meanitme I'm getting my Big Lift II ready

http://www.rcuniverse.com/forum/m_69.../anchor/tm.htm

but I think I'll drop it earlier using a friend's plane (another BL II).
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Old 03-26-2008, 12:00 PM
  #39  
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Default RE: rcskydiving.com Beginner Jumper

I need your advise!

I'd like to locate the drop box inside the fuse but it interferes with the steel plate the wing struts connect to. So I can mount the drop box onto the outside or inside the fuse but a less closer to the CG than it is possible with the outside mounting.

Let's sum up with the 3 mounting options

1. EXTERBAL drop box right behind the main gear = let's say neutral to the CG



2. EXTERNAL drop box over the main gear = slightly negative pitching moment?



3. INTERNAL drop box right behind the wing struts attachment bracket = positive pitching moment



Do you think the trimming may deal with this last option?

The CG is located right in front of the long hole

Thank you for your advises!
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Old 03-26-2008, 02:26 PM
  #40  
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Default RE: rcskydiving.com Beginner Jumper

In my own opinion you should not put the drop box in front of the CG. If you want a little behind it is not a problem, the best of course being right on the CG.
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Old 03-26-2008, 03:01 PM
  #41  
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Default RE: rcskydiving.com Beginner Jumper

Hi Dave and thank you for dropping by!

I'm in touch with a friend who owns a Big Lift for glider towing and he said there shouldn't be any problem in mounting the drop box in the last position (the rearmost): this is what I really prefer as it allows me to bury the box inside the fuse for greater ground clearance.

I'll keep you updated!

Thank you!
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Old 03-26-2008, 08:42 PM
  #42  
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Default RE: rcskydiving.com Beginner Jumper

Hi,

Seems like you have already decided on your mounting location. I prefer to keep the box on the cg or just slightly forward.
It is easier for me to fly the plane by having to hold a little up elevator rather than having to push the nose of the plane down. Just my opinion.

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Old 03-27-2008, 02:11 AM
  #43  
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Default RE: rcskydiving.com Beginner Jumper

You're right Gary and this is what I wanted to do!

Fact is that this plane almost doesn't react to the mass delta in that location: this is what I've been told by a fellow modeler who has been flying the Big Lift for years now.

I can try myself, in case something doesn't suit me I still have the resources to mount the box externally and right on the CG.

You can program 2 different trim settings and switch between them during flight instead of pushing the stick forward.

Thank you!
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Old 03-28-2008, 01:15 PM
  #44  
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Default RE: rcskydiving.com Beginner Jumper

OK, here it is what I came up with in the last two days...

I took the alumimun drop box I had and made a lite-ply version to bury inside the fuse:





I also added a lite-ply floor all around the box for added strength:



I then checked the ground clearance and it turned out more than adequate:





I'm pretty satisfied right now but I still need to fix some other details.
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Old 03-28-2008, 03:48 PM
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Default RE: rcskydiving.com Beginner Jumper

Hi,

It looks like it will work just fine where you have it, can't wait to see the finished plane.
I'm not familiar with the big lift. I started with the drop box in my plane recessed, but I wanted to move it farther forward and coultn't because it was up against the landing gear. I added an external box and have it fastened using the landing gear bolts.

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Old 03-29-2008, 02:44 AM
  #46  
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Default RE: rcskydiving.com Beginner Jumper

Thank you Gary!

I can't move the box more forward than that because of the steel plate used to anchor the wingstruts: if you look the pic carefully you'll see that I opened the slots to slide that plate in place just in front of the box.



I also added some half-bulkheads to reinforce the main gear plate and the rearmost bulk sandwiches the wingstrut plate together with the box:



BTW, this is how the steel plate looks like:

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Old 04-01-2008, 12:34 PM
  #47  
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Default RE: rcskydiving.com Beginner Jumper

I ended the mods required to house the drop box: for extra strength I added 2 sq. hardwood rails that runs all the way through the fuse sides.





This way the fuse floor won't be the only one carrying the extra weight.

I'm also finishing the release mechanism: this is a very classical setup...

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Old 04-10-2008, 11:40 AM
  #48  
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Default RE: rcskydiving.com Beginner Jumper

OK, I finally managed to get some Dubro super strength servo arms for Futaba servos (compatible with BlueBird) and I completed the new installation.

I decided to have a transparent chest plate so I could check at a glance if everything is fine inside there: I was worried about something getting tangled without notice thus leading to a catastrophic failure.



Even with the chest plate installed you may enjoy a nice internal view:





There's plenty of room in the end but things work only with a particular positioning.

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Old 04-10-2008, 10:19 PM
  #49  
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Default RE: rcskydiving.com Beginner Jumper

g boxwood:

When you start dropping have someone take pictures of jumper and send them to me so that I can put them in the rc archive so that you and other jumpers can see you jumper in action.


Bob
fair winds and blue skies [8D]
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Old 04-11-2008, 03:08 AM
  #50  
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Default RE: rcskydiving.com Beginner Jumper

HI g-boxwood,

The transparent case looks cool. Just a tip rather have the receiver battery pack sit on the front of your divers belly (where your receiver is now on your photos). It will not only help with the CG being lower in freefall but will also prevent the receiver from being crushed by the battery if you have a dirt dive.

Wrapping the receiver with protective foam is also a good idea, remember even with the chute open these little guys can come in fast and the receiver will get some shock even on normal impact landings.

Just my opinion

Regards,
Fanie
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