Hello

Some info about this gazoline engine
Puissance: 4,1CV@8500t/mn (Traction statique 9,0kg)
Régime: 1500-8500t/mn
Cylindrée: 34,9cc
Alésage: 38,5mm
Course: 30mm
Poids: moteur: 940g - Système d'allumage: 130g - Pot: 70g env.
Hélices bipales recommandées: 18x10, 19x8, 20x8, 20x10"

http://www.topmodel.fr/product-detai...-temps-essence

Claude

Specifications:

Power: 4.1 HP @ 8500RPM (Static thrust 9.0 kg)

RPM: 1500-8500RPM

Displacement: 34.9 cc

Bore: 38.5mm

Stroke: 30mm

Weight: Engine: 940g - Ignition system: 130g - Pot: 70g approx.

Two-bladed recommended propeller : 18x10, 19x8, 20x8, 20x10"


Claude, have you run one yet?

Hello Matt

Not yet. I'm very interested by this engine to install in a new pattern we have in project with friend of mine.
The project is to design and built a entire economic scratch build plane for young modelists I learn to fly dual every week end.

Claude

I got 7650 with a Xoar 19x8 and 7050 with an APC 19x11 today. It was pretty hot and humid. Stock muffler and DLE 30 ignition on a 14 lb Cap 232. I have about 10 eight min flights so far. Runs great, muffler leaking on the side is my only complaint.

7K on muffler, 19x11 apc, is fairly good. Should pick up 400-500 on pipe. 7400-7500 on pipe should be about the same as the YS170 delivers, maybe a tad better, except it's gasoline not 25% nitro glow.... The YS's are terrific powerplANTS BUT THESE LATEST GASOLINE 2 STROKE OFFERINGS ARE TRULY WORTH A SECOND LOOK....Ooooops, sorry for the caps, I'm not screaming

Matt, how do the bore/stroke/porting compare to the OS?

I could imagine that you might have the most optimal gasser pattern set-up on the planet right now with the OS.

But DLE seems to be taking a crack at it!

Bob,

Not sure about the porting of the DLE....The bore/stroke of the DLE is about 1.27 (quite a bit overbore), while the same for the OS is 1.1 (closer to square). That doesn't mean all that much without porting data tho. Port timing and cross sectional areas of passages are most critical. Exhaust porting is critical for pipe use and boost as well. Compression ratio also is very important

Nevertheless, the DLE35RA appears to produce similar output to the OS, based on this one data point the earlier poster presented.... I will probably get one to see for myself what it does on pipe. I have a 50$ coupon from Tower so that brings the cost more in-line with most 30cc engines at around 300$.

The rear exhaust configuration works soooo much easier on pattern planes. No need to cant the engine to fit the header in the fuse; no need for an expensive Hatori RTC header, plus a stub header, or special shaped couplers to make things fit, etc. I believe the OS140RX Macs header from Tower should fit the exhaust of the DLE35 with only minor mods.

Husky gasser still on hold Matt? All the slimer vs electric posts this week get me wondering if your 100LL's will be the real "spoiler." cheers!

Vanquish is on the rafters of my garage. Much too humid and hot to work on anything right now. Can't hardly wait for Fall to get projects off my bench

With the price of glow fuel I'm seriously eye balling this engine as just an all around motor warbirds, pattern, aerobatic, etc. I gave electric a go but wasn't thrilled with the charge times and the power to weight didn't seam that great, even though the low hassle and 100% reliability were great.

Guys, what you think about put the 35ra in a sukhoi 25% greatplanes? the plane is designed for the bricky fuji bt43 that weighs 1,8 kilos with only 0,1 hp more. i want 3d

anything new on this?

have considered pattern for awhile, but don't want to deal with electric or glow.

tony

There is at least one other option that I am very familiar with and close to. If you look in the Pattern Forum you will see my thread on the OS33GT. Some Europeans are also using the PTE36R in Pattern applications. I also have a PTE36R and that will go into a Vanquish conversion from electric

We finally have truly usable gasoline options in Pattern. These engines have terrific top ends but most importantly, have lots of grunt in mid range, where Pattern pilots like to fly.

To get the most out of Pattern gassie you should also consider soft mounting and using a pipe on the model. It's a sound similar to well tuned glow 2 strokes we're familiar with such as the OS140RX and Webra 145/160.

BTW- FWIW- My OS33 piped set-up uses the same props as YS170/175 do and turns these at similar rpm. If the YS170-175 are the defacto standard for glow Pattern, these gas engines are really worth a good look

what are good airframe matches for these piped gas engines?

tony

Anything set up for glow power that has a full pipe belly. Or you may need to add a pipe floor to something less.

I suspect that anything set-up for electric will also be okay but will need some additional reinforcement around the engine compartment. That is as simple as adding some carbon cloth area to distribute the load better. The electric set-ups will also need a pipe floor added. I used 1/32" balsa glass laminate in past models. All else is the same

In my current design on the bench the pipe floor is blue foam/glass laminate.

If you are not sure, consider the EF Extra for gas'glow. It isn't a pattern plane but is a good teacher. It is very big and needs all the power it can get. The 33GT and the PTFE36 are good matches. And it is around 400$ plus shipping...cheap!

I had a soft mounted, piped DLE55 in mine turning a 20X12 Mezjlik 3 blade carbon prop. That was an amazing combo. Alas, a bad SpektruM RX ruined that one....BUT 12 1/2 lbs all up with around 36 lbs of thrust...sweeet! Gave new meaning to the term "throw around"

yeah i understand your point.
i fly imac now with a 40% carden and a da170 and my new plane is a carden 300 pro with a da200.

i haven't read all through this thread and others, but thought the dle35ra would be a good choice due to the rear exhaust port making a pipe easier to install.

i have a 50cc EF extra now that i could use for sportsman, but if i'm gonna fly pattern, i think i would rather use a pattern plane. so for now, i would like to get an arf or used plane and a gas engine and see where it goes.


tony

how about a focus 1?

what header and pipe match up with the rear exhaust of the dle35?

also, how do you compare the header length for the 35 rear exhaust with a stub header with a side exhaust engine and a RTC header?

tony

The length that works really well with the 30-40cc engines is 27" from the exhaust flange to the reflector baffle. It doesn't matter whether you have a rear or side exhaust...you follow the exhaust path to make the measurement

yeah thats what i thought, so for a given pipe, the overall length would be much longer for rear exhaust engine!

tony

Hi

I just bought this engine for a 120 size WarBird . I like ballistic , it,s gets you into trouble ,............................ but also gets you out of trouble

Michel

Hi All,

I have a strange problem with my new 35ra. I received it with a muffler that has short pipes instead of the longer ones in the product page. Kindly refer to the attached pic. Is this normal? I have never seen any 35ra with such small piped muffler and, DLE engine-support is not giving me a proper answer . Did anyone of you got similar looking muffler along with DLE 35ra? Or am I being fooled with a counterfeit ?

Edit: DLE confirmed that it is a standard muffler from their factory! I wonder why they ship two kinds of mufflers to different parts of the world! Even the carb on mine is different (DLE with a metal fuel nipple)!