Hi Guys,

I am planning to get into petrol engines after flying electric for a long time.  I plan to setup a 26cc or a 50cc gas plane (preferably a YAK).. But problem is I am a noob to all this.  Have always been into electrics.  So I would be really grateful if someone could guide me on what setup I should look at.  The things I am looking at are,

Engine (DL, MVVS, SPE)
Airframe (any suggestions?? 3D models only)
Servos (would prefer cost effective ones)
Rx (AR7000)
RX Power supply (11.1V 2650 mAh Lipo with BEC)
Prop (no idea!!)

What should be the AUW for a 26cc plane / 50cc plane?

And is it better to go in for a 50cc instead of a 26cc?  I am looking for a budget oriented setup.  Other than the engine and airframe, is there any other expense involved in taking a 50cc compared to the 26cc?

Rough pricing would also help a lot.

Thanks a lot guys in advance.

Regards,
Chan

Hi man,

why dont you try out the Sukhoi 26-45 CC( see the attachment).Its a great plane for 3d.You can suit it with a SPe 45(Rs11200) or a spe 26(Rs 8800) avl in rotor.Most of all you need to put in some nice servos-I would for sure suggest Futaba digital Servos.P.S. Apart from the obvious increase in engine and model cost there is no other addtnl expense in moving from 26 to 50 cc(The size of the model too doesnt increase dramatically)

Model Seen at : http://mpowershopping.in/mpower_arf

Thanks Ghanesh.  I saw the model.  Somehow I always preferred YAKs to Sukhois! I think I would stick with either a YAK or an Edge.  Anyways that is a very nice model but should be able to fly nicely on a 45 to 50 cc engine.  I personally feel it might be underpowered with a 26cc.  But lets see.  Would keep it on my list.  Futaba Digital Servos cost a bomb.  I was looking more into Hitec which has high quality digital servos.  But what torque and timing should i use?  How many servos are required?  Does a 50cc need more servos than a 26cc??

Chan

Hi Chan,

Please see the link below we have many models to choose from for both 26cc & 50cc ARF

http://www.rcdhamaka.com/index.php?main_page=index&cPath=64

We have also upload a video of Yak55 50cc on the forum which is flown by Meenakshi Sundaram the link of the video is http://www.rcindia.org/gas-glow-nitro-planes/yak-55-sp-50cc-flown-in-chennai/

Apart from him Rajesh Narayanswamy & Capt Velraj from chennai have picked up the gassers from www.rcdhamaka.com

The props would be 22x10, 22x8 to start with for 50cc & 16x8, 17x6 for 26cc to start with.

The models sold by us is the same that is sold by www.peakmodel.com www.eastrc.org www.cermark.com www.dawghouserc.net

PLane Specs:

Wing Span 71in /1800mm
Wing Area 976sq in / 63sqdm
Fuselage Length 61in / 1550mm
Flying Weight 11.5lbs / 5800g
Engine Required 26cc(Normal Performance)-45cc( High end 3d)Gas Engine
Radio Required 5Channels 8servos

mate how long to you wanna stick to your yak fixation!!Personally the su is my choice.Well you said it right the model does require 45cc engine if you need top performance.And the no of servos wont increase mate

Hi Sanjeev,

I have seen both of Mr.Meenakshi's Yak 50cc from you and I was flying with Rajesh last week.  He had brought the 26cc Yak.  I got the gas idea from him only.  And Mr. Meenakshi is a big motivation for me to get into Gas as well!! specially after seeing his 50cc YAK.. So am just waiting for the right setup.. Once I decide on the servos and the engine, I would definitely get in touch with you!  Am not able to check your site.  It has been recently blocked in my office.

Chan

Hi Chan,

Welcome to the world of "NOISY" flying. I just barely got into Gasser before my plans to move.

If you need a "real" 3D gasser, go for 50cc. The raw power of gas engines will be unleashed if the cc is above 40.. 50 being a perfect fit. If you have the budget go for the DA... best VFM is RCGF engines. RCGF seem to have good review and have more power/rpm for equivalent sized SPE or DLs. SPE is on the low end and it seems to be widely available in India. I have one 26cc the power seem to be OK.

For 26cc you need a prop of 17x6 to 18x8. The mannual that comes with the engine should give you a good idea of the prop sizes.

One important aspect of gas engines are that they are very very sensitive to needle settings (high/low end). It really helps if you understand the working of the gas engine carb as it is not as simple as the glow engine carb. Tuning the engine is a bit tricky as even a 1/16th of a turn will have pronounced effect on the engine performance. As a result you may need to tune the enigne now and then for different wheather conditions. Once you get the hang of it, you would love gas engines... I am sure there are lots of experienced folks in Chennai who can guide you very well.

I guess, once you fly the gasser you would feel... "Louder the better".
Here is a link to an intro on gas engine carbs..

http://www.drystacked.com/Walbro%20Carburetor%20Theory%20ebook1.pdf

-Ismail

I too am very curious about information on gassers.  All  I have seen so far is one gasser heli (Century Predator), and I know they can run forever on one tank    The owner was a real pilot in Qatar Airways, and said he preferred long flights.  Nitro setups would only give him around 10 minutes of max flying time, while the gasser would give him around 30 minutes !

Can a 50cc gas powered plane hover and do torque rolls ?  Do they generate enough thrust ?

well sir the gassers run pretty much the same way as nitro ones do.I myself am in the process of setting up a gasser(superstar with a RCGF 26cc).Also i have been in close quarters when Mr.Nosheer in Chennai flew is 50Cc yak.And he was just about rocking the whole way through

Quote from: anwar on March 31, 2009, 12:08:27 PM
Can a 50cc gas powered plane hover and do torque rolls ?  Do they generate enough thrust ?

Anwar,

If you need to hower at half stick, do a torque roll and then pull up vertical to the sky.. then you should think of 50cc and above... There may be a few gassers at lower displacement but my opinion is these smaller engines will be running at the verge of ceasing itself to deliver that kind of power.

Most 3D flyers prefer Gas to Glow becuase of the thrust it generates.  The prop sizes that a Gas Engine can spin are also much bigger.  Add to this the advantages of fuel availablity and lesser muck.  That was the reason I am planning a nice Gas setup instead of a Glow.  I already have a few glow planes and engines which I am not using.  I have a .46 Funstar and a .60 King Kobra as a part of my Hangar and also a couple of .15 and .25 engines.  Avoiding all this for quite sometime.  But my obsession for noisy flying (as Ismail rightly pointed out) is taking over now!!! The next problem is the transportation.  Would sort that out soon.  After taking Ismail's suggestion, i think I would get a RCGF 46cc engine and couple it up with a 50cc YAK.
Servos should still be finalized.

Would the 4cc drop in power be significant?? Something like the difference between .40 and .46 glow engines?? or is it negligible??

Are the RCGF 46cc engines more powerful than the DL / SPE 50ccs??  I have not come across 50cc engines from RCGF!

Thanks for all the suggestions.

Chan

Chan,
Check these KATANA  out I dont have stock of it but can get it for you as I am their dealer electric products :
http://www.rvminc.net/products.php?cat=161

Sai

Don't know if you can, but I smell freedom here ! 

Finally, I see hobby shops openly competing for business in a professional manner, ultimately benefitting the hobbyist.  Links of competing products are being thrown around liberally, and merits and demerits are being discussed ! 

We are living in interesting times !  Free times !

QuoteChan,
Check these KATANA  out I dont have stock of it but can get it for you as I am their dealer electric products :
http://www.rvminc.net/products.php?cat=161

Sai

Thanks uncle.  Am not able to access that site here in office. Would definitely check it out.

There is a poll conducted in RCGroups sometime back.. It should be still available I guess. RCGF topped the poll as good VFM and good performance for moderate standandard gasser. DA was on the high end and there is no question about its performance.

On the servos, go for good metal gear ones. Lots of it availabe from Hitech. PowerHD servos seem to be getting popular and is getting good reviews. Never use the chinese brands like tower pro, etc.. They have centering issues, drain the battery a lot, and get warm.. I have one of these chinese brands in my Zeus aircraft and I regret using it.

Further, use a pull-pull set up for the rudder and elevator with an idler assembly. The idler assembly will be reduce excess stress on the servos. Capt. Manish is the right person to approach on this.

-Ismail

Thanks for all the info Ismail.  Would definitely get Capt. Manish to brief me on the idler assembly.  Moreover, one thing that has been troubling me is, is the 46cc RCGF going to be less powerful than the 50cc DL / SPE??  Is the 4cc difference significant??

Chan

50cc is pretty standard displacement. Should be available. Googling for "RCGF 50cc" shows some hits.

5cc is a significant deal in engine displacement. However, the model that you use for 40cc or 50cc is about the same so, you would not feel any major differences. Anyway, try to get 50cc if available.

One more aspect of gasser is that they tend to vibrate a lot... Since you have been flying electrics, you will be greatly astonished by the amount of vibration these enignes put out. In fact, you can feel the tail feathers shaking intune with the engine vibration. Take adequeate steps for vibration suppression techniques when mounting the engine.

-Ismail

Quote from: chanvivek on March 31, 2009, 12:05:24 PM
Hi Sanjeev,

I have seen both of Mr.Meenakshi's Yak 50cc from you and I was flying with Rajesh last week.  He had brought the 26cc Yak.  I got the gas idea from him only.  And Mr. Meenakshi is a big motivation for me to get into Gas as well!! specially after seeing his 50cc YAK.. So am just waiting for the right setup.. Once I decide on the servos and the engine, I would definitely get in touch with you!  Am not able to check your site.  It has been recently blocked in my office.

Chan

Any time Chan

Hi Ismail,

RCGF 50cc is available.  But in India, I was able to find the 45cc version (not 46cc), with Sunil.  But i think that should do!

And regarding the vibrations, I would definitely take care to use supression techniques!

Thanks for all the help

Chan

Keep us in the loop in your final choice, prices, build, test flight etc etc   

One of the most interesting aspects of RC is to see others fly, and see their equipment.  I request everyone to maximize posting of such information.  To the same effect, I request everyone to start posting their hangar information also.

A friend of mine suggested that the 5645s for the aileron / elevator is a bit risky.  I am left with no choice other the 7955s which cost a bomb!! So i need to get 5 7955s which is going to cost me about 30k!!  Is there any other safer alternative for the servos?? Anyone has tried any other configuration?  I would also appreciate any reviews on the newly introduced DL-55 and the MT-57.  Debating between the two engines now. 

Any personal experience with the MT-57 would be greatly appreciated.

- Chan

You could look at Hyperion Atlas DS20 or DS20x servos. It is new in the market and have been getting good reviews.

Hi RotorZone,

I just checked out the Hyperion Servos.  There is one servo called the Hyperion Atlas DS20xUMT (i think).. that is the only one with torque greater than 20kgs.  Could you please publish more data on that?  And if you stock it, could you also let me know the pricing.  Thanks.

- Chan

Sorry we don't stock it. It was just for your info since I was seeing quite a few good reports about them recently. Also note that they specify torque and stall torque. Most other manufacturers just specify stall torque. That is the number you should compare.

Thanks for the info.  I would also do some ground work on the Hyperion Servos.  Am looking for alternatives for hitec.  But everyone around me who fly gassers are using only Hitec.  Just wanted to break the stereotype !!  There is no doubt that Hitec is one of the best.  But there should be other options (cheaper) that we should look at and analyze as well..  Being a regular Hyperion user, I know the quality standards of these people and would trust a Hyperion servo if I find some good reports on RCG / RCU!! Let me start my home work now!!

- Chan