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Roto 25

Old 09-17-2005, 07:45 AM
  #251  
raston
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Default RE: Roto 25

I cut a hole large enough for the cap to 'just' go through, and fashioned a snug fitting plug that accomodated a rubber grommet the right size for the wire. Split the grommet, put around the wire, then stuff the plug into the hole.
Old 09-17-2005, 08:21 AM
  #252  
finless
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Default RE: Roto 25

Raston, looking at your pictures I see that now. Good job as I had not noticed the "plug" before.
This is how I did it on my Christen Eagle so I guess good minds think alike
However I have seen pictures of some peoples planes and no plug is visible. I have to assume they desoldered the cap or something.

On my new GP giant stik I was lucky that it had a hatch plate on the bottom so all I had to do was cut a notch in the end of the plate to run the spark plug wire.
Had it not had this plate there was not a whole lot of space to drill a giant hole in the fire wall for the cap to fit through!

BTW, my Roto 25 is on this stik for now until I finish the spitfire. The 25 will come off the stik and be replaced by a 35.
The 25 fly’s this stik really well but it could really use a 35 for all out performance.

Bob
Pictures of my stik below

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Old 09-17-2005, 10:10 AM
  #253  
Tsutomu Mabuchi
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Default RE: Roto 25

Richard. L,
Thanks, your suggestion helped me much.

finless,
I installed the ignition module on the firewall with adhisive
tape, ignition battery is after the firewall in the fuselage.
I wanted to place the ignition module as far as possible
from the receiver and the C.G was just fine, and no big
hole was needed on the firewall.
Old 09-17-2005, 10:40 AM
  #254  
Richard L.
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Default RE: Roto 25

Tsutomu, so engine heat has no negative effects on the ignition module?
Old 09-18-2005, 09:43 AM
  #255  
Tsutomu Mabuchi
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Default RE: Roto 25


ORIGINAL: Richard L.

Tsutomu, so engine heat has no negative effects on the ignition module?
Richard L.,

No bad effects so far, for several flights though.
I made a relatively big hole under the cowl as an
air outlet. That may be working well.

Tsutomu Mabuchi
Old 10-03-2005, 10:06 AM
  #256  
Yak18
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Default RE: Roto 25

Finless. your installation looks terrific. I think the Roto 25 is just what I need for my GP Ryan STM. Is that a bisson muffler you have installed? I need the narrowest engine/muffler package I can get.

Thanks, Yak
Old 10-03-2005, 06:19 PM
  #257  
finless
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Default RE: Roto 25

Yak, it is SuperSonic I think. I got the engine with the muffler and the seller on RCU told me he got it from RCShowcase as an option so I assume that is what it is. However he told me it was a Slimline muffler and RCshowcase does not offer slimline for the ROTO 25. So which it is I am not sure. To me it looks like a Slimline as I have Slimline mufflers on other nitro engines. Still he said he got it from RCShowcase......

RCShowcase does not show a picture but the URL is here for the muffler they offer:
[link=http://www.rcshowcase.com/html/accessories/mufflers.html]http://www.rcshowcase.com/html/accessories/mufflers.html[/link]
Scroll to the bottom for ROTO 25 and it lists a SuperSonic.

When I check the Slimline web site I do not find the ROTO 25 listed but if it is a slimline then it must be the same bolt pattern as another engine they list.......
Slimline is here:
[link=http://www.slimlineproducts.com/]http://www.slimlineproducts.com/[/link]

Sorry I could not answer you properly but I am just unsure.
Bob

ORIGINAL: Yak18

Finless. your installation looks terrific. I think the Roto 25 is just what I need for my GP Ryan STM. Is that a bisson muffler you have installed? I need the narrowest engine/muffler package I can get.

Thanks, Yak
Old 10-03-2005, 09:42 PM
  #258  
cadconversions
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Default RE: Roto 25

I can confirm that it's a supersonic. I have the same muffler for my roto 35vi.
Old 10-04-2005, 05:01 AM
  #259  
finless
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Default RE: Roto 25

Thanks! At least I know what my muffler is now ;-)

Bob



ORIGINAL: cadconversions

I can confirm that it's a supersonic. I have the same muffler for my roto 35vi.
Old 10-04-2005, 10:08 AM
  #260  
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Default RE: Roto 25

Thanks Cad and finless, I now see the muffler listed on the RCS site. Perfect! I appreciate your help.

Yak
Old 11-21-2006, 12:08 AM
  #261  
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Default RE: Roto 25

I have been watching this thread for a while and taken bits of advice from many. i mounted my Roto 25 in a 1/4 scalt balsa USAFokker D8 picured here. Performance is spectacular, engine is smooth and power plenty for this 13Lb model. i used a steering arm for both throttle and choke, mounting the servos for both on the firewall. no interference issuse. i am spinning an 18x6 simitar prop which looks great and runs well. This is a fantastic engine. i am buying another one for my next scale project. i will then own two.. maybe a twin is in my future!!!!

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Old 11-21-2006, 09:12 AM
  #262  
rmh
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Default RE: Roto 25

Great looking 8.
I give it a "10"
Old 11-21-2006, 10:27 AM
  #263  
cadconversions
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Default RE: Roto 25

Wow, very nicely detailed and great report. Everyone loves Twins!!!!!
Old 12-19-2007, 11:21 PM
  #264  
cessna20
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Default RE: Roto 25

Dear Tsutomu,


I would like to install ROTO 25 or ROTO 35 on my giant scale Hangar 9 Cessna 182.
Please advise where possible to buy nylon mount?

Best regards,

Boris Kharchenko
(Russia Ekaterinburg city)
Old 04-07-2008, 03:38 PM
  #265  
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Default RE: Roto 25

Roto 25 will pull the big H9 cessna very well. Ive seen them fly on everything for a G23 to a G45!!! It has at least as mouch power as a G26 and is a smoother running motor.
Old 01-27-2020, 06:44 AM
  #266  
beli
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Default

I am building the seagull van's rv8 I still haven't picked an engine for it. Should I go with dle 20ra or roto 25? It will be my first gasser. (weight is not a issue since the model requires nose weight even with a dle 30)

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