Hi

I'm building a Genesis from CAmodel and I will be using a Plettenberg 25-12 to power it, I would like to know if anyone of you guys have pictures of the installation of this engine in a similar airplane, an adjustable engine mount is the idea so I can modify the incidences easily.

Regards

Fernando V.

this is from the ZNLine site,

http://www.znline.com/photos.php?lan...ource=produits

Hi Fernando,

First of all I would like to discourage you from installing an Xtra 25-12 in a Genesis. I think it will be too little power. I have this year been running an Xtra 25-13 in a ZN-Line Synergy (weight approx. 4.8kg), and the motor will pull the model along fine, but it is very difficult to keep the motor cool. I would suggest you get an Xtra 30-10 for your Genesis instead.

For the mounting of the motor maybe you can use the method I used. Please see the photos below:

Is it hard to keep Xtra 25-13 cool even without spinner?

Best regards,
Kristian

From your pictures you have no flow path through the firewall. This is important to cool the motor, without it I can understand why you are having a tough time cooling the 25-13.

My 25-13 ran only slightly hotter (5-10C) than my 30-10 does, but I was also running 7-8A more current through it as well.

Can773: Do you have pictures of your flow path in your airplane ??

Mola: thanks for the pictures. I know the 25-13 is a little underpower but this Genesis is for a customer who doesn't want to compete with it.

Regards

Fernando Viollier

Hi Chad,

The pictures above are from pre-flight condition... I do have air flow through the firewall as the pictures below show, however I do admit that I could possibly have even more. The problem with the mounting system I have chosen is that the Synergy is rather narrow in the front end, and therefore the extra vibration damped plate I'm using limits the space for further air holes in the firewall. If I were to do it again I'm not sure that I would use the vibration damping mount (well nuts) since the model is plenty quiet as it is. Actually it is nearly too quiet in the air...

Because of the temperature problems I was having I did the spinner modification I saw you had done on your Enigma, but to be honest the effect is very limited. I'm presently flying without the spinner cone, and that does improve the situation.

Basically the issue with these very compact outrunners is that they are completely hidden behind the spinner, and then again the Synergy is maybe not an ideal model for electric propulsion because it is so narrow in the front. I have tried to improve on the situation, but I guess that part of the problem is that the Xtra 25-13 is being pressed a little above the specifications. I'm running an APC 19x12W at approx. 6300-6400rpm at just below 70 Amps. I think the Xtra 30-10 or maybe the Cyclon F3A would be better. I have attached a couple of pictures of the Cyclon as well, since I bought one in France. Except for some of the winding work it looks OK, but it is HEAVY!