airbusdrvr

I have not been in the electric flying area for a good many years and need help finding a motor/gearbox if one exists. A neighbor of mine crashed his small modified slope glider(I guess this is what it was before being made electic). As you can see in the pictures below an outrunner has been added to the nose. During this repair, I would like to install the motor inside the fuselage. Now the problem and reason for the question. There is only about 7/8" of room(vertically and horizontally measured) in the forward fuse. This would dictate an inline geared brushless inrunner motor. The plane will probably be in the range of 18-24 oz AUW and has a wingspan of 48". I'm not interested in hotliner performance. Just a motor that would allow internal mounting and give the plane good performance. If possible include a link to whatever might be recommended.

One added comment. These pictures are prior to the crash. She doesn't look so pretty now[][]

OzMo

My Feedback: (3)

I think a brushless inrunner would work. Something around 800 to 1000 Kv with an OD that would fit in the nose. With a folding prop and a nose cone.
Give us some dimensions of the nose area or firewall if you can please. and nose to wing TOO as that will limit prop length.

airbusdrvr

OzMo, the fuse is oval shaped at the fwd bulkhead and the external dimensions are 1 1/8" wide and 1 5/16" high. However, as mentioned in my first post, the inside dimensions at the fwd bulkhead are 7/8"W X 7/8"H.

aeajr

My Feedback: (2)

Please define "good performance".

ROG?
Pattern?
Holds altitude at 2/3 throttle?

Rather than moving the motor inside, why not just build a cowl to put over it? Idon't use geared motors anymore, and the gearboxes I found that might be suitable would not fit. Ilooked at www.hobby-lobby.com , www.maxxprod.com and www.neumotors.com and www.hobbycity.com

airbusdrvr

I took the fuse with me to the flying field day before yesterday. I had discussed this issue with a flying friend who is all electric. He brough out several motors and we discovered that an Axi 2208 and Riimfire 400 outrunner would just fit inside the fuse. So when I do the repair to the nose section, I will probably enlarge the inside just a bit to accomodate a through-the-firewall mount of one of these two motors.

My next problem to solve will be finding a folding prop that is in the 8 X 6 range with a spinner compatible with the 1 5/16" nose diameter and that will still fold beside the fuse. All this is taking a bit of education on my part as I have not been involved electrically in RC for three to four years. I still have two old electrics that I occasionally fly but they are four years old and I have not kept up with all that has evolved since that time.

aeajr

My Feedback: (2)

AXIlists 9 versions of the 2208. Which are you considering?
http://www.modelmotors.cz/index.php?...kategorie=2208

The Rimfire 400 looks like a good choice but I would probalby lean more to the 10X4.5 or even a 10X5over the 8X6. My modeling software says that with a 10X5 it will draw 14 amps/151 watts and will climb straight up. Usually with gliders you want wider props. It has a 3mm shaft which you will need to know as you look for folding props.
http://www.electrifly.com/motors/gpmg4505.html

40 mm spinner is probably what you will need. Here is one with a 3mm shaft:
http://www.hobbycity.com/hobbyking/s...idProduct=5561

airbusdrvr

aeajr,
It appears I will be leaning toward the Axi 2208 34. The owner of the crashed plane has a spare 2208 34. Now I just need to get into my possession the prop. I do not want to start reshaping the nose without knowing what the prop spinner diameter will be. Interesting link for the Hobby King stuff. I bought a couple of batteries from them and my experience was good. I have read of some unhappiness with some of their other items, though. I have on an older sailplane a Graupner Cam folding prop and have been nothing but pleased with it since day one. That thing must have a hundred hours on it and still running straight and true. A good quality item. However, for this project a CAM folding prop with shipping would be $40-$50. The owner wants to keep the cost down as much as is reasonable so I'll spend some time looking at your links.

The Axi has a 3.2mm(1/8") shaft. I found this combo, http://www.hobbycity.com/hobbyking/s...idProduct=8657 , which is a 9X5 size. Using your link above for the 40mm spinner alone, I wasn't confident that using the Hobby King site I could find a set of 10X5 blades that would fit the spinner you referenced.

aeajr

My Feedback: (2)

That set-up should work for the Rimfire 400. You can later pick up some 10X5 blades if you are not happy with the performance with the 9X5. but the Rimfire 400 is a more powerful motor than the 2208-34.



The 2208-34
http://www.modelmotors.cz/index.php?..._EVP&line=GOLD

Ths isonly an 85 watt motor andthat would beusing a 3S lipo with a 9X3.75 motor which pushes it to its limit. With that prop combo, which would give the highest performance this motor can provide, you would be at about 56 watts/pound but you could only hold that throttle position for about 45 seconds before the motor would start to overheat.And that assumes plenty of airflow over the motor and ESC. At that power levelthat should get you aget you about a45 degree climb.

I think an 8X4 would work on a3S pack as well and still give you a 40degree climb.

On 2S you should be able to go to a9X6,but again, limit yourfull throttle runs to no more than 60 seconds and make sure there is plentyair flow.

The specs say no more than 8 amps and only 60 sconds. For continous running, don't exceed 7 amps.The testedcombos are shown below.

Motor	Prop. w/o gearbox	Battery	I/A	RPM	U (V)	P- OUT (W)	P- IN (W)	Efficiency (%)
2208/34	9x3,75 APC Slow	2xLi-Poly	5,5	6190	7,1	31	39	79
2208/34	9x3,75 APC Slow	3xLi-Poly	8,8	7880	9,6	63	84	75
2208/34	10x4,75 APC Slow	2xLi-Poly	7,8	4820	6,6	36	51	70
2208/34	9x6 APC Slow	2xLi-Poly	7,8	4890	6,6	36	51	70
2208/34	8,5x5 Aer Glas	7x N350AA	4,9	6870	7,6	30	37	80
2208/34	8,5x5 Aer Glas	8x N350AA	5,8	7510	8,4	39	48	79
2208/34	8,5x5 Aer Glas	10x N350AA	7,6	8640	10	59	76	77
2208/34	8x6 Graup. CAM slim prop	7x N350AA	6,2	6140	7,3	35	45	77
2208/34	8x6 Graup. CAM slim prop	8x N350AA	7,3	6660	8,1	44	59	75
2208/34	9,5x5 Aer Glas	7x N350AA	6,9	5820	7,2	37	49	74